Forstner bits drill the cleanest flat-bottomed holes in wood — period. They are the cabinet maker's tool for 35mm European concealed hinge cups, the joiner's tool for clean pocket holes, and the DIY woodworker's tool for any application that needs a flat-bottom hole without tear-out. This guide covers the 35mm European hinge cup standard (the single biggest reason Forstner bits exist in modern workshops), sizing from 8mm to 60mm+, HSS vs HCS vs TCT (tungsten carbide tipped) material selection, the "go slow" speed rule, drill press vs handheld use, and the Sutton + P&N range stocked at AIMS — grounded in 15+ forum-validated insights from r/woodworking, Sawmill Creek, LumberJocks, Woodworkers Journal and AU joinery forums.
AIMS stocks 4 Forstner bit products. Sutton Tools dominates 3:1 with the D523 single bit plus the 4-piece and 12-piece HCS (High Carbon Steel) sets — the AU patriot premium pick. P&N provides the 35mm tungsten carbide hinge bit for production-volume cabinet making. See the Forstner Drill Bits collection.
What is a Forstner bit?
A Forstner bit is a specialised wood-boring drill bit that produces a clean, flat-bottomed hole with smooth walls. The geometry is distinctive: a small centre brad point (or guide spur) for positioning, two outer rim cutters that score the hole circumference before the main cutting edges remove material, and two flat cutting wings that scrape out the hole bottom flat. The result is the cleanest hole you can drill in wood — far cleaner than a spade bit, an auger, or a hole saw.
The Forstner bit was invented by American gunsmith Benjamin Forstner in the 1870s as a precise wood-boring tool for gun stocks. Modern Forstner bits retain the same fundamental geometry but with improvements in steel chemistry, heat treatment, and (in premium tools) tungsten carbide tips for production-volume use.
Forstner bits are also called Forstner drill bits, hinge bits (when the 35mm size is referenced for European hinge installation), flat-bottom drill bits, and sometimes cup bits. All refer to the same product class.
The 35mm European hinge cup standard — why this size matters most
The single most-searched Forstner bit size in Australia is 35mm. The reason: every European concealed cabinet hinge uses a 35mm cup recess. Blum, Hettich, Häfele, Grass, Salice, Mepla — all European hinge manufacturers standardised on a 35mm cup diameter decades ago, and modern AU cabinet making, kitchen joinery and furniture manufacture is now dominated by these concealed hinges.
Every kitchen door, every cabinet door, every wardrobe door, every modern flat-pack furniture cabinet uses a 35mm Forstner-bored cup. The hinge cup sits in the 35mm hole and supports the door's full weight through the cup-to-cabinet fit — not through the four small screws. That's why the 35mm fit must be precise: the strength comes from the cup snugly seating in the door, not from the screws.
The Sutton HCS Forstner Drill Bit Set (10–35mm, 12 pieces) includes the 35mm size as the largest in the set — the most-used hinge cup size in AU cabinetry. The Sutton 4-piece set (16/20/26/35mm) is the more compact cabinet-maker's kit covering the four most-used sizes. For high-volume production cabinet making, the P&N 35mm Tungsten Carbide Forstner Bit is the premium pick — tungsten carbide cutting edges last 5–10x longer in MDF, particle board and dense hardwoods.
The AU cabinet-making workflow: mark hinge cup centres on the door (typically 100–120mm from the door top and bottom edges), centre-punch each location, set drill press depth stop to 12.5mm (the cup depth for most Blum/Hettich hinges), drill the 35mm cup with the 35mm Forstner bit at 600–900 RPM with steady feed pressure. Stop the bit before it breaks through the door back. Insert hinge cup, secure with the two small screws into the cabinet-side mounting plate.
Critical warning — brad point penetration on thin doors. A standard Forstner bit's centre brad point extends approximately 3–5mm beyond the main cutting wings. On a thin door, this brad point can punch through the front face of the door before the cup hole reaches full depth, leaving a visible witness hole on the show side. Direct woodworkforums.com.au practitioner quote: "The centre point of a Forstner bit is approximately 5mm high. On a 16mm MDF door drilled to 12.5mm cup depth, the brad point will exit the front face." The fix: use a dedicated hinge boring bit (different product class — see next section), or set the drill press depth stop conservatively and check brad point clearance for the specific door thickness. 18mm and thicker doors are safe with standard Forstners; 16mm and thinner doors need hinge boring bits or careful depth verification.
Hinge boring bit vs Forstner bit — the specialty subclass
The "use a hinge boring bit, not a standard Forstner" advice surfaces repeatedly on AU cabinet-making forums. The distinction matters when working with thin doors (16mm and below) and high-volume production cabinet work.
Hinge boring bits are a specialty subclass of flat-bottom drill bits designed specifically for European concealed hinge installation. Compared to standard Forstner bits, hinge boring bits typically have:
- Shorter centre brad point — typically 1–2mm vs the 3–5mm of standard Forstners. Reduces the brad-point-punch-through risk on thin doors.
- Dedicated 35mm diameter — purpose-built for the European hinge cup standard. No size variation.
- Tungsten carbide tips — almost universally TCT because of the MDF/melamine prevalence in modern cabinet work.
- Optimised geometry for end-grain and engineered woods — the cutting angles suit the production cabinet maker's daily material rather than general workshop variety.
AIMS' core stock is general-purpose Forstner bits (Sutton HCS sets and the P&N 35mm TCT). For dedicated hinge boring bits with the short brad-point geometry, source through the supplier network — specialist brands include Famag Bormax 3, Festool, Colt Maxicut and dedicated hinge bit makers. For general AU cabinet making on 18mm+ doors, the standard 35mm Forstner range works perfectly. For 16mm doors or thinner, ask the AIMS team about hinge boring bit options.
Forstner bit anatomy — the geometry that makes the clean hole
Understanding Forstner geometry helps with bit selection, sharpening, and troubleshooting:
| Part | Function |
|---|---|
| Centre point (brad point) | Positions the bit at the marked centre — does not drill, just locates |
| Rim cutters (scoring spurs) | Two sharp spurs on the outer rim that score the hole perimeter cleanly before the main cutters arrive — this is what gives Forstner bits their clean edge |
| Main cutting edges (wings) | Two flat blades on the inside of the rim that scrape out the wood between the centre and the rim — this is what flattens the hole bottom |
| Cutting rim (continuous or sawtooth) | Continuous-rim Forstner bits have a smooth scoring edge (clean walls, slower); sawtooth-rim Forstner bits have teeth on the outer edge (faster cutting, less clean walls) |
| Chip clearance | The bit body is narrower than the cutting edges, allowing chips to clear up the centre of the bit body — but only at moderate feed rates |
| Shank | Standard 3/8" hex or round shank for general-purpose use; some larger sizes use 1/2" shank |
The "scoring before cutting" principle is what differentiates a Forstner bit from a spade bit. A spade bit's flat cutting edge tears through the wood fibres simultaneously — the result is splintering, tear-out and rough walls. The Forstner's rim cutters score the perimeter first, then the main wings remove the inside material between the scored lines. The wood fibres are severed cleanly at the rim before the bulk material is removed.
Sizing — 8mm to 60mm+ workshop range
Forstner bits are typically available from 8mm to 60mm, with specialty larger sizes (75mm, 100mm) available for niche applications. The 12-piece Sutton HCS set covers 10–35mm in 2mm or so increments — the standard AU workshop range.
| Size | Typical use |
|---|---|
| 8–12mm | Small bolt holes, dowel pockets, decorative inlay |
| 14–18mm | Medium dowel work, peg holes, cable pass-throughs |
| 20–25mm | Bolt cap recesses, electrical conduit pass-throughs, hardware mounting |
| 26–35mm | European hinge cup (35mm is the universal standard) + medium cabinet hardware |
| 38–50mm | Large hardware recesses, speaker box port holes, decorative bowl-edge inlays |
| 50–60mm+ | Speaker boxes, custom port holes, large decorative work |
The "buy the set then add singles" rule. Most AU cabinet makers and joiners start with a multi-piece Forstner set (12-piece Sutton HCS is the AU standard) and add specific sizes as project needs require. The 35mm is the single most-used standalone bit (the Sutton D523 single bit or the P&N 35mm Tungsten Carbide are the workshop singles).
HSS vs HCS vs TCT — material selection
Forstner bits come in three material grades:
| Grade | Best for | AIMS product |
|---|---|---|
| HCS (High Carbon Steel) | General workshop use, hardwoods and softwoods, occasional drilling. Most affordable. Sharpenable. | Sutton D523 single · Sutton 12-piece set · Sutton 4-piece set |
| HSS (High Speed Steel) | Higher temperature tolerance than HCS, longer edge retention. Mid-tier price. | Specialty import — source on request |
| TCT (Tungsten Carbide Tipped) | Production volume work, MDF, particle board, dense hardwoods (jarrah, ironbark, spotted gum). 5–10x edge life of HCS. | P&N 35mm TCT |
The MDF and particle board warning. HCS Forstner bits dull rapidly in MDF and particle board — the urea-formaldehyde resin and abrasive filler in these engineered woods are very hard on plain steel cutting edges. AU cabinet-making shops working primarily in MDF/melamine board should specify TCT Forstner bits. The P&N 35mm TCT is the AIMS pick — for additional sizes in TCT, source through the supplier network.
The HCS sharpening advantage. HCS Forstner bits can be sharpened with a small diamond file or a dedicated Forstner sharpening jig — extending tool life by 2–3 cycles. TCT bits cannot be re-sharpened by hand (specialist diamond wheel service required, usually not economic). For occasional / workshop use, HCS + sharpening discipline = lower total cost than TCT.
Forstner vs spade vs hole saw — the decision matrix
The most-asked Forstner question: when do I use each? The forum-validated decision matrix:
| Tool | Best for | Speed | Hole quality |
|---|---|---|---|
| Forstner bit | Clean flat-bottom holes, partial-depth holes (hinge cups, blind holes), precise diameter where finish matters | Slowest — 150–1,200 RPM depending on size | Cleanest possible. Smooth walls, flat bottom, minimal tear-out |
| Spade bit | Fast rough holes through wood — electrical conduit, plumbing pass-throughs, framing | Fastest — self-feed geometry pulls bit through | Rough walls, splintered exit hole, not for visible work |
| Auger bit | Deep holes in heavy timber, framing, log cabin work | Fast — self-feed screw point | Better than spade, not as clean as Forstner |
| Hole saw | Through-holes only, large diameters (above 50mm), thin material | Medium | Clean perimeter, can't do flat-bottom or partial-depth holes |
| Self-feed bit | Production framing — through-holes in studs and joists, electrical/plumbing | Very fast — aggressive self-feed | Rough, not for visible work |
The Forstner-only-when-you-need-it rule. Forstner bits are slower and more expensive than alternatives. Use them only when you specifically need a clean flat-bottom hole or a partial-depth hole. For rough through-holes in framing or hidden work, a spade bit is faster and cheaper. For large clean through-holes, a hole saw is the right tool. For hinge cups, decorative work, and precision joinery — Forstner every time.
Speed and feed — the "go slow" rule
Forstner bits run dramatically slower than other drill bits. This is the single biggest cause of forum-flagged Forstner problems — operators run them at twist-drill RPM and the bit burns the wood, dulls instantly, or chips the cutting edge.
| Bit diameter | Recommended RPM | Notes |
|---|---|---|
| 8–15mm | 1,200–1,800 RPM | Small bits run faster — less rim-friction heat buildup |
| 16–25mm | 800–1,200 RPM | The workshop default RPM range |
| 26–35mm | 500–900 RPM | 35mm hinge cups: 600–800 RPM is the cabinet-maker's standard |
| 38–50mm | 300–600 RPM | Large bits — slow speed to manage rim friction |
| 50–60mm+ | 200–400 RPM | Very large — drill press strongly preferred at these sizes |
AU hardwood speed adjustment. The RPM table above is based on US/EU hardwoods (oak, maple, walnut — Janka hardness 4–6 kN). Australian hardwoods are significantly harder: jarrah Janka 8.5 kN, ironbark Janka 16 kN, spotted gum 11 kN, blackbutt 9.1 kN. Reduce the table RPM by approximately 30% for AU hardwood work. Direct AU practitioner figure: "a 2-inch Forstner in jarrah needs about 175 RPM, not 250." The harder the timber, the slower the bit must run to control rim friction and prevent burn. Specialty AU hardwoods like gidgee respond better to well-sharpened HSS than to cheap TCT — the premium European HSS Forstners (Famag Bormax 3, Colt Maxicut) outperform budget carbide-tipped bits in these abrasive dense timbers.
The peck cycle rule. For Forstner holes deeper than the cutting wing depth (typically 25mm into hardwood, 30mm into softwood), use a peck-drilling cycle: drill 5–10mm, retract fully, clear chips from the hole, drill another 5–10mm, retract again. Chips packed against the rim cutters cause friction heat that burns the wood and dulls the edges. Direct quote from Sawmill Creek Woodworking Community: "Go in no more than the depth of the bit then back out, and gently run a piece against the turning bit to knock the chips out."
The "let the bit do the work" rule. Forstner bits cut on their sharp rim, not by brute force. If you need to push hard, something is wrong — usually a dull bit or RPM too high. Forum-validated direct quote from LumberJocks: "Forstner bits should not require any great amount of pressure — if they do, something is wrong." Reduce RPM, clear chips, check bit sharpness.
Drill press vs handheld — why drill press wins
Forstner bits work best in a drill press. The reasons are mechanical:
- Perpendicularity — a Forstner bit's flat cutting wings need perfectly perpendicular entry to cut evenly. Handheld drill tilt causes one wing to cut deeper than the other, producing an angled hole bottom.
- Constant feed pressure — drill press quill feed is steady; handheld feed varies and causes burning or chipping.
- Depth control — drill press depth stop sets the cup depth exactly. Handheld depth is operator-judged and inconsistent.
- Rigidity — Forstner bits generate significant lateral cutting force, especially on the larger rim cutters. A drill press resists this; a handheld drill flexes and causes off-centre holes.
When handheld is acceptable: small bits (under 16mm) for non-critical holes, on-site installation work where a drill press isn't practical (e.g. fitting hinges to an already-installed door), and shallow holes (under 5mm depth). Use a brad-point starter hole, slow RPM, and steady pressure. Even then, the hole quality is noticeably below drill press standard.
For handheld 35mm hinge cups: a Forstner bit drilling jig (template with bushing) significantly improves results. The jig clamps to the door and constrains the bit position. Most AU cabinet shops use a drill press for production volume + a hand jig for on-site installation work.
Why Forstner bits burn wood — and how to prevent it
Burning is the most-flagged Forstner problem on woodworking forums. The friction-heat mechanism is well-understood: the bit's outer rim is in continuous contact with the wood fibres but has no relief — unlike a twist drill which has flute clearance behind the cutting edges, the Forstner rim is solid. Heat from rim friction has nowhere to dissipate. If the bit isn't cutting efficiently, the heat builds up rapidly and chars the wood at the rim contact.
Top 5 burning causes (forum-validated, Woodworkers Journal + LumberJocks consensus):
- Dull bit. The most common cause. Sharp Forstners cut cool. Dull Forstners rub. Sharpen or replace.
- RPM too high. 35mm bit at 2,000 RPM will burn end grain in seconds. Drop to 600–800 RPM.
- Feed too slow. Counter-intuitive but real — if the bit rubs without cutting, friction heat builds. Increase feed pressure (not pressure on the bit — feed rate into the wood).
- Chips not clearing. Packed chips block fresh wood contact, increasing friction. Peck-drill: 5–10mm in, retract, clear, repeat.
- Drilling end grain at high RPM. End grain is harder than face grain — Forstner bits in end grain need RPM reduction and slower feed than face grain work.
Blow-out prevention — the backer board rule
When a Forstner bit breaks through the back of the workpiece without backer support, the unsupported wood fibres on the exit side splinter and blow out. The result: a clean entry hole and a destroyed exit. This ruins through-holes in visible work.
The fix is simple: clamp a sacrificial backer board to the back of the workpiece before drilling. The backer board supports the wood fibres at the breakthrough point. The Forstner bit drills cleanly into the backer — the exit hole on the workpiece is as clean as the entry.
For partial-depth holes (hinge cups, blind holes), this doesn't apply — the bit doesn't break through, so there's no exit fibre to support. Backer board is specifically a through-hole concern.
Alternative approach: drill from one side until the centre point just emerges through the back face, then flip the workpiece and finish drilling from the other side. The two cuts meet in the middle and both faces are clean. This technique works well for thick stock where backer board clamping is awkward.
Sharpening Forstner bits
HCS Forstner bits can be sharpened by hand with patience. The geometry is forgiving — slight imperfection won't ruin hole quality the way it would on a twist drill.
What to sharpen:
- Rim cutters (scoring spurs) — the highest-wear parts. Sharpen with a small diamond file or cone-shaped diamond hone. File the inside (cutting) face, not the outside.
- Main wing edges — file the underside (the face that does the cutting). Maintain the original bevel angle.
- Centre brad point — rarely needs sharpening; minor damage is OK because the brad point doesn't cut, it just positions.
Sharpening tools: small flat diamond file (DMT, EZE-Lap), small cone-shaped diamond hone, or a dedicated Forstner sharpening jig. Specialist sharpening services exist (most AU joinery supply stores can refer) for serious workshop use.
When to scrap vs sharpen: HCS Forstner bits typically sharpen 3–5 times across service life. Bits with chipped or broken rim cutters cannot be easily restored — scrap. Bits where the centre point is bent off-axis should be scrapped (hole position will be wrong). TCT Forstner bits cannot be hand-sharpened — diamond wheel specialist service required, often not economic for single bits.
Common failure modes
| Failure mode | Cause | Prevention |
|---|---|---|
| Wood burns / chars at rim | RPM too high, dull bit, chips not clearing | Drop RPM, peck-drill, sharpen or replace bit |
| Bit wanders off centre | Brad point not seated, handheld drill tilt | Centre punch the position; use drill press |
| Hole bottom not flat | Drill not perpendicular (handheld tilt) | Use drill press |
| Exit hole splinters / blows out | Through-drilling without backer board | Clamp sacrificial backer; or flip-and-finish from other side |
| Bit chips edge / breaks rim cutter | Hit a knot, hit a nail, dropped tool, side load | Inspect workpiece before drilling; never drill with lateral force |
| Cup hole too small for hinge | Bit nominal diameter doesn't match — wrong size bought | Verify hinge spec: European = 35mm. Buy the correct size. |
| Bit dulls rapidly | MDF / particle board / dense hardwood with HCS | Switch to TCT (P&N 35mm) for these materials |
| Drill bogs down, motor stalls | RPM too low, feed too aggressive, chips packed | Increase RPM moderately, reduce feed, peck-drill |
| Rim cutters not scoring perimeter | Bit dull at the rim spurs | Sharpen the rim spurs with diamond file |
| Sawdust packed in bit body | Deep hole, no peck cycle | Peck-drill: retract every 5–10mm to clear |
AU woodworking applications — where Forstner bits earn their keep
Forstner bits serve specific applications in Australian woodworking. Knowing which job needs a Forstner (and which can use a cheaper alternative) helps with bit selection and saves money. The most-common AU applications:
- Kitchen and laundry cabinet making — the 35mm European hinge cup is the universal standard. Every cabinet door = two 35mm Forstner holes. Volume cabinet shops use TCT (P&N 35mm) for daily-driver work; smaller cabinet makers use HCS (Sutton 12-piece set covers the range).
- Built-in wardrobe construction — same 35mm hinge cup standard, often higher hole count per project (10–20+ doors per wardrobe). TCT pays back quickly.
- Flat-pack furniture assembly and repair — IKEA, Fantastic Furniture, Amart and similar use 35mm European hinges throughout. Replacement and repair work needs the 35mm Forstner.
- Speaker box and audio enclosure building — port holes (50mm, 60mm typical), driver mounting cutouts (76mm, 100mm, 132mm typical). Forstner bits for the smaller sizes; hole saws for above 60mm.
- Dowel joinery — clean pocket holes for dowel reinforcement. 8mm, 10mm and 12mm Forstner bits give precise, flat-bottom pockets that dowel glue fills cleanly.
- Decorative inlay and bowl edge recesses — recessed inlay work, coin display boxes, gun cabinet handle recesses. Forstner gives clean shoulders the inlay sits flush against.
- Hardware mounting recesses — door knob mortices, drawer pull recesses, hidden bolt cap covers. Partial-depth flat-bottom holes are Forstner territory.
- Australian hardwood work — jarrah, ironbark, spotted gum, blackbutt. Dense and abrasive on cutting edges. TCT Forstner significantly outlasts HCS in AU hardwood production.
- Restoration and antique repair — careful drilling in valuable timber. The Forstner's clean cut prevents tear-out in figured veneer and old hand-planed surfaces.
- Boat building and marine joinery — flush hardware recesses in deck timber. Stainless screw cup recesses where the Forstner bit creates the screw head sitting recess.
For full drilling reference across all material types and tool families, see our Drill Bit Types Guide and Choosing the Right Drill Bit guide.
Cabinet maker workflow — the 35mm hinge cup sequence
The standard AU cabinet-making workflow for European hinge installation, showing where the Forstner bit fits into the wider job:
- Set out hinge positions on the door. Mark hinge cup centres on the door back at standard distances from the door edges — typically 100–120mm from the top and bottom edges, and 22.5mm from the door edge (the standard cup-to-edge distance for most Blum/Hettich hinges).
- Centre-punch each hinge cup position. A nail set or automatic centre punch creates the brad point seat for the Forstner.
- Set the drill press depth stop. Standard hinge cup depth is 12.5mm for most Blum, Hettich and Häfele hinges. Some heavy-duty hinges require 13.5mm. Check the hinge manufacturer spec.
- Mount the 35mm Forstner in the drill press chuck. The Sutton D523, the 35mm from the Sutton 12-piece HCS set, or the P&N 35mm TCT for production. See our Drill Chuck Guide for chuck selection.
- Set the speed. 600–800 RPM is the cabinet-maker's standard for 35mm at the drill press. Adjust based on door material — softwood pine slightly faster, dense hardwood slightly slower.
- Position the door under the bit. Centre-punch dimple aligns with the brad point. A workshop fence on the drill press table sets the consistent 22.5mm edge distance for production work.
- Drill the cup. Steady feed pressure, no peck cycle needed (the 12.5mm depth is within the wing length). Stop when the depth stop bottoms out.
- Drill the second hinge cup on the same door. Position is set by the fence and a stop block.
- Repeat for all doors. Production work: rack doors in sequence, drill all top hinge cups, then re-rack and drill all bottom hinge cups.
- Install hinges. Cup into the door hole, screw mounting plate to the cabinet side, snap-fit the hinge arm into the mounting plate.
A single production cabinet shop typically drills 200–400 hinge cups per week. This is why the P&N 35mm TCT pays back the cost premium quickly — HCS dulls in 40–60 holes on MDF/melamine; TCT runs 400+ holes between sharpenings.
AU brand reality — Sutton + P&N at AIMS
AIMS Industrial stocks 4 Forstner bit products across Sutton Tools (AU patriot) and P&N (AU value). The supply ladder maps to workshop scale:
Sutton Tools (AU patriot — 3 SKUs)
Sutton Tools is Thomastown VIC-based and the AU patriot Forstner range. All three Sutton SKUs use HCS (High Carbon Steel) construction — sharpenable, cost-effective for occasional and workshop use:
- Sutton D523 Forstner Drill Bit — single Forstner bit in the workshop standard sizes. The "buy what you need" option for adding to a kit.
- Sutton HCS Forstner Drill Bit 4-Piece Set (16mm, 20mm, 26mm, 35mm) — the cabinet maker's compact kit. Covers the four most-used cabinetry sizes including the 35mm European hinge cup standard.
- Sutton HCS Forstner Drill Bit 12-Piece Set (10–35mm) — the comprehensive workshop kit. The "buy once, cover everything" pick for joiners and cabinet makers.
P&N (AU value — 1 SKU, TCT premium)
P&N provides the premium TCT (Tungsten Carbide Tipped) option for production-volume cabinet making:
- P&N 35mm Forstner Drill Bit — Tungsten Carbide — the production cabinet shop pick. 5–10x longer edge life in MDF, particle board and dense hardwoods compared to HCS. The right tool for high-volume European hinge cup work.
Honest scope — brands NOT stocked at AIMS
The Australian and international Forstner bit market includes specialty woodworking brands not stocked at AIMS:
- Famag Bormax 3 (Germany) — German premium Forstner specialist. The Bormax 3 model is widely considered the global #1 Forstner bit by woodworking practitioners on Sawmill Creek, LumberJocks and r/woodworking. AU specialty woodworking import. Not stocked at AIMS — specialty source on request through the supplier network.
- Fisch (Germany) — German premium specialist alongside Famag. Forum consensus: "Quality brands include Fisch, Famag and Zobo from Germany." Not in AIMS supply.
- Zobo (Germany) — German specialty Forstner manufacturer. Premium tier alongside Famag and Fisch.
- Festool — German power tool premium with own Forstner range. Forum consensus: "Festool Forstner bits are notably good — other than Bormax 3, they made the best holes."
- Colt Maxicut (Germany) — premium German specialist, the Maxicut range is specifically called out on woodworkforums.com.au as the AU specialty pick. Available through AU woodworking retailers; not in AIMS core stock.
- Freud (Italy / USA) — Italian-designed, US-distributed. Premium TCT and HSS Forstner range. Forum-validated: "Freud carbide edged Forstners have served for over 15 years and are still going strong."
- Carbatec (AU) — Australian woodworking specialty retailer with own-brand and imported Forstner bits. Common AU joiner reference brand.
- Timbecon (AU) — Australian woodworking specialty retailer with imported Forstner range.
- Irwin, Bosch, Ryobi, DeWalt — general hand-tool brands with Forstner ranges at various tiers. Available through Bunnings and general tool retailers.
- Diablo — forum-flagged as "mid-to-low rent brand, not premium quality" by r/woodworking and Sawmill Creek consensus. Available through US specialty retailers; not recommended for production work.
For these brands, source through our supplier network — call AIMS on (02) 9773 0122 or use the contact form with your spec.
Sutton's competitive position in AU Forstner market. Sutton Tools' Thomastown VIC manufacturing facility competes against German specialty brands (Famag, Colt) and global premium (Freud) on AU-manufactured origin, local technical support, and short supply chain. For volume AU cabinet shops, the Sutton 12-piece HCS set is the workshop cost benchmark — covering 10mm to 35mm in a single carded pack at a price point well below European premium imports. The P&N 35mm Tungsten Carbide complements the Sutton range as the production-volume specialty pick where edge life in MDF and dense hardwoods matters more than purchase cost.
What's missing from the AIMS Forstner range: we're upfront that 38mm, 40mm, 50mm and larger Forstner bits are not currently in core stock. AU cabinet making rarely needs sizes above 35mm — the European hinge standard dominates AU joinery. Speaker box builders, audio enclosure manufacturers, and specialty woodworkers needing larger diameters source through the supplier network. Larger AU hardwood project work (jarrah furniture, ironbark bench tops) typically uses different drilling approaches (hole saw + clean-up router cut) rather than oversize Forstner bits.
Forstner bit selection checklist + common mistakes
Before buying, run through this 8-point checklist:
- Identify the most-used size. For cabinet making: 35mm (European hinge cup standard). For general joinery: 16/20/26/35mm covers most needs. For specialty: pick the specific diameter your job requires.
- Set vs single decision. Mixed workshop work = the Sutton 12-piece set. Production single-size work = singles (Sutton D523 or P&N TCT for the 35mm).
- Material grade. HCS for hardwood/softwood occasional use. TCT for MDF/particle board/dense Aussie hardwoods (jarrah, ironbark, spotted gum) or production volume.
- Drill press requirement. Sets are designed for drill press use. If only handheld is available, expect compromised hole quality.
- Shank size match. Most Forstner bits use 3/8" hex or round shank, fitting any 10mm or 13mm chuck. Verify your drill chuck capacity.
- Sharpening plan. HCS sharpens with diamond file. TCT requires specialty service (often not economic). Plan replacement vs sharpening cycle.
- Backup plan. Production cabinet work: stock a second 35mm bit. Bits dull at the worst moment.
- Storage. Forstner bits are precision tools. Original case or wall-mounted bit holder protects the rim cutters from damage.
Top 10 forum-validated mistakes:
- Running at twist-drill RPM. 35mm Forstner at 2,000 RPM = burned wood and dull bit in seconds. Use 600–800 RPM for 35mm.
- Pressing too hard. Forstner cuts on rim sharpness, not pressure. If you need to push hard, something's wrong.
- Drilling deep holes without peck cycle. Packed chips burn the wood. Retract every 5–10mm.
- Handheld drilling for hinge cups. Drill press strongly preferred. Handheld with no jig = wobbly cup hole.
- No backer board on through-holes. Exit splinters and blow-out. Clamp sacrificial board.
- Using HCS in MDF. Dulls bit in 20–30 holes. Specify TCT for sheet goods.
- Skipping the centre punch. Brad point walks if not seated firmly. Centre-punch the hole position.
- Drilling end grain at face-grain speeds. End grain is harder — reduce RPM and feed.
- Replacing instead of sharpening HCS bits. HCS sharpens 3–5 times. Diamond file does the job.
- Buying generic sets without rim quality. Cheap Forstner sets have poor rim spurs — clean holes are impossible. Sutton HCS sets have proper scoring rim geometry.
Frequently Asked Questions
What is a Forstner bit used for?
Forstner bits drill clean, flat-bottomed holes in wood. They are the standard tool for European concealed hinge cups (35mm size), pocket holes for dowel joinery, partial-depth holes for hardware mounting, speaker box ports, decorative inlay recesses, and any wood-drilling job where the hole quality matters. They do not work in metal — they are wood-specific tools.
What size Forstner bit do I need for a European hinge?
35mm. Every European concealed cabinet hinge (Blum, Hettich, Häfele, Grass, Salice, Mepla and all others) uses a 35mm cup recess. The 35mm dimension is the universal European hinge cup standard. The Sutton 4-piece set (16/20/26/35mm) includes the 35mm size; the Sutton 12-piece set (10–35mm) includes 35mm as the largest; the P&N 35mm Tungsten Carbide is the high-volume cabinet shop pick.
What's the difference between Forstner bit, spade bit and hole saw?
Forstner bit: clean flat-bottom holes, partial-depth work, the slowest but cleanest cut. Spade bit: fast rough through-holes in framing and rough work, splintered exit, not for visible joinery. Hole saw: through-holes only, large diameter (above 50mm), thin material. Forstner is the right tool for hinge cups, blind holes and clean visible holes. Use spade or hole saw for rough work or large through-holes where the finish doesn't matter.
Why is my Forstner bit burning the wood?
Five common causes: (1) RPM too high — 35mm bit needs 600–800 RPM, not 2,000. (2) Dull bit — sharpen or replace. (3) Chips not clearing — retract every 5–10mm to clear. (4) Feed too slow — the bit rubs without cutting, generating friction heat. Increase feed pressure modestly. (5) End grain at face-grain speeds — end grain is harder, reduce RPM further.
What RPM should I run a Forstner bit at?
Speed depends on bit diameter. 8–15mm: 1,200–1,800 RPM. 16–25mm: 800–1,200 RPM. 26–35mm (workshop default range including 35mm hinge cup): 500–900 RPM. 38–50mm: 300–600 RPM. 50mm+: 200–400 RPM. The rule is "go slower than you think" — Forstner bits run far slower than twist drills or spade bits because the rim is in continuous friction contact.
HCS or TCT — which Forstner bit should I buy?
HCS (High Carbon Steel) for general workshop use, hardwoods and softwoods, occasional drilling. Lower cost, sharpenable 3–5 times. The Sutton 12-piece HCS set is the AU workshop default. TCT (Tungsten Carbide Tipped) for MDF, particle board, dense Australian hardwoods (jarrah, ironbark, spotted gum), and production-volume cabinet making. 5–10x longer edge life, higher cost, not hand-sharpenable. The P&N 35mm TCT is the AIMS pick for production cabinet shops.
Can I use a Forstner bit in a handheld drill?
Possible but compromised. Drill press is strongly preferred because Forstner bits need perpendicular entry, constant feed pressure, depth control and rigidity. Handheld work produces angled hole bottoms, wandering off centre, and inconsistent depth. For small bits (under 16mm) and non-critical shallow holes, handheld is acceptable. For 35mm hinge cups, drill press or a Forstner drilling jig (template with bushing) is recommended for usable results.
How deep can a Forstner bit drill?
Depth is limited by the cutting wing length — typically 20–30mm for standard bits. For deeper holes, a Forstner bit extension is required. The extension fits the bit shank and adds 100–300mm of reach. Use peck-drilling (retract every 5–10mm to clear chips) for any hole deeper than the wing length.
Can I sharpen a Forstner bit?
HCS Forstner bits can be sharpened with a small diamond file or cone-shaped diamond hone. File the inside (cutting) faces of the rim spurs and the underside of the main wing edges. HCS bits typically take 3–5 sharpenings across service life. TCT (tungsten carbide tipped) Forstner bits cannot be hand-sharpened — specialist diamond wheel service is required, usually not economic for single bits.
How do I prevent blow-out when drilling through?
Clamp a sacrificial backer board to the back of the workpiece. The backer supports the wood fibres at the breakthrough point so the exit hole is as clean as the entry. Alternative: drill from one side until the centre brad point just emerges through the back, then flip the workpiece and finish drilling from the other side. The two cuts meet in the middle and both faces are clean. For partial-depth holes (hinge cups), no backer needed — the bit doesn't break through.
What is the difference between continuous-rim and sawtooth Forstner bits?
Continuous-rim Forstner bits have a smooth scoring spur on the outer rim — they cut clean walls and produce the cleanest possible hole, but cut more slowly. Sawtooth-rim Forstner bits have small teeth on the outer rim — they cut faster but produce slightly rougher walls. For cabinet making, joinery and visible work, continuous-rim is preferred. For rough work and faster cutting, sawtooth wins. The Sutton HCS range uses continuous-rim geometry.
Why is the 35mm size so important for European hinges?
Every European concealed cabinet hinge (Blum, Hettich, Häfele and others) uses a 35mm diameter cup recess as a global standard. The hinge cup sits in the 35mm hole and supports the door's full weight through the cup-to-cabinet fit — not through the four small mounting screws. The 35mm fit must be precise: too small and the cup won't seat; too large and the door drops over time. Modern AU cabinet making, kitchen joinery and flat-pack furniture all rely on this dimension.
Are Forstner bits suitable for metal?
No. Forstner bits are wood-specific tools. The geometry — scoring rim spurs, flat cutting wings, large continuous-contact rim — is designed for the way wood fibres respond. In metal, the rim spurs would shatter, the cutting wings would chip immediately, and the friction heat would destroy the bit in seconds. For flat-bottom holes in metal, use a counterbore (see our Counterbore Drill Bits Guide). For round holes in metal, use a twist drill, annular cutter, or step drill depending on the size.
Why is Famag Bormax 3 recommended on forums but not stocked at AIMS?
Famag Bormax 3 is the German premium Forstner specialist's flagship model, consistently rated by woodworking forums (Sawmill Creek, LumberJocks, r/woodworking) as the global #1 Forstner bit. AIMS Industrial focuses on Australian-manufactured (Sutton Tools) and Australian-brand (P&N) Forstner bits for the core catalogue — the AU patriot supply story. If you specifically need Famag Bormax 3, Fisch, Zobo, Festool, Colt Maxicut, Freud or other European/specialty brands, we'll source through our supplier network — call (02) 9773 0122 or use the contact form with your spec.
What is the difference between a Forstner bit and a hinge boring bit?
Hinge boring bits are a specialty subclass of flat-bottom drill bits designed specifically for European concealed hinge installation. Compared to standard Forstner bits, hinge boring bits have a shorter centre brad point (typically 1–2mm vs the 3–5mm of standard Forstners) which reduces the risk of brad point punch-through on thin (16mm) cabinet doors. They are usually dedicated 35mm diameter, almost always tungsten carbide tipped, and optimised geometrically for engineered wood (MDF, melamine, particle board). Standard Forstner bits work fine on 18mm+ doors; for thin 16mm doors or production volume cabinet work, dedicated hinge boring bits are the better choice. AIMS stocks general-purpose Forstner bits; hinge boring bits source on request through the supplier network.
Why is the RPM table different for Australian hardwoods?
The standard Forstner RPM tables are based on US/EU hardwoods (oak, maple, walnut — Janka hardness 4–6 kN). Australian hardwoods are significantly harder: jarrah is 8.5 kN, ironbark is 16 kN, spotted gum is 11 kN, blackbutt is 9.1 kN. The standard speeds produce excessive rim friction in these denser timbers, causing burning and rapid bit dulling. Reduce the table RPM by approximately 30% for AU hardwood work. Practitioner reference: a 2-inch Forstner in jarrah runs at about 175 RPM, not 250. Premium HSS Forstners (Famag Bormax 3, Colt Maxicut) actually outperform cheap TCT bits in AU hardwoods because well-sharpened HSS cuts where blunt TCT rubs.
Where do I buy Forstner bits in Australia?
AIMS Industrial stocks 4 Forstner bit products. Sutton Tools D523 single bit plus 4-piece (16/20/26/35mm) and 12-piece (10–35mm) HCS sets. P&N 35mm Tungsten Carbide for production cabinet making. See the Forstner Drill Bits collection. For Famag, Freud, Colt, Carbatec, Timbecon, Irwin, Bosch, Ryobi or DeWalt specialty Forstner ranges, source through our supplier network on request.