A sanding disc is a circular abrasive consumable that fits a powered sander — random orbital, palm, disc, angle grinder, drill, or die grinder — to grind, smooth, level, polish or strip a surface. The right disc cuts twice as fast and lasts five times as long as the wrong one. The wrong choice on stainless steel will burn out in minutes; the wrong backing material on aluminium will load and clog within a single pass.
This guide is the technical breakdown that the typical retail product page skips: the abrasive grain golden rule for matching grit to metal (r/metalworking forum-validated), the hook-and-loop vs PSA decision with its repetitive strain injury implications, the dust extraction hole patterns (5/6/8/9-hole) that determine tool compatibility, the fibre disc backing pad setup that catches every angle grinder operator out, and the FEPA P-grade vs CAMI grade distinction that determines whether your "120 grit" is actually 120 grit.
AIMS stocks 371 SKUs across the abrasive disc ecosystem — see /collections/sanding-discs (234 SKUs), sanding belts (103 SKUs) and fibre discs (34 SKUs). Brand reality and selection guidance below.
What is a sanding disc — and what it isn't
A sanding disc is a flexible or semi-flexible circular abrasive designed to fit a powered sander. It removes material by abrasion — small abrasive grains cut tiny chips from the workpiece surface — distinct from grinding (heavy stock removal with bonded wheels), cutting (thin reinforced discs), or polishing (no abrasive grain, just compound).
Sanding discs are used for surface preparation (rust, paint, mill scale removal), levelling (flat-face sanding after fabrication or filler), finishing (progressive grit to smooth surface), feathering paint edges (automotive body work), and pre-paint surface prep across wood, metal, plastic, fibreglass and composite materials.
Key distinctions you'll see in the AIMS catalogue and across competitor product pages:
- Sanding disc — flexible circular abrasive, usually paper or film backing, attached by hook-and-loop or adhesive
- Fibre disc (resin fibre disc) — semi-rigid heavy-duty disc with vulcanised fibre backing for angle grinder use. Different product class from regular sanding discs
- Flap disc — overlapping abrasive flaps on a backing, gives a finer finish than a fibre disc. See our Flap Disc Guide
- Grinding disc — bonded abrasive wheel for aggressive stock removal. See our Grinding Disc Guide
- Cutting disc — thin reinforced wheel for cutting, not sanding. See our Cutting Disc Guide
- Sanding belt — continuous loop of abrasive for belt sanders
Norton Abrasives sums up the family relationship: "Grinding discs are for aggressive removal, flap discs are slower but give a better finish, and fiber discs respect the flatness of the steel." Sanding discs sit between flap discs and fine-grit grinding discs — broader surface contact, less aggressive removal, much finer finish.
The abrasive grain golden rule — match grain to metal
The single most important technical decision in sanding disc selection is the abrasive grain material. The forum-validated rule, repeated across Reddit r/metalworking, r/Welding, and r/Blacksmith threads:
This is the rule that separates the workshop that gets a season of life from a single disc from the workshop that goes through five discs to finish one stainless cut. The grain chemistry determines whether the abrasive shatters into fresh sharp edges as it wears (which is what you want) or simply rounds over and skates (which kills cut speed). Different metals demand different grain chemistries.
| Abrasive grain | Best for | Avoid on | Forum reputation |
|---|---|---|---|
| Aluminium oxide (Al₂O₃) | Wood, soft metals (aluminium, brass, copper), mild steel light work, paint stripping, general sanding | Stainless, hardened steel (wears too fast) | The workshop default. Forms ~70% of AIMS sanding disc inventory. Sufficient for most jobs |
| Zirconia alumina | Mild steel, structural steel grinding, heavy stock removal on ferrous metals | Wood (overkill), very fine finishing | r/Welding: "Zirconia resin is preferred" for fibre disc work. Self-sharpens as it wears — outlasts aluminium oxide 3-5× on steel |
| Ceramic alumina | Stainless steel, hardened tool steel, Inconel, titanium, hard chrome, weld zones | Wood (overkill), aluminium (clogs easily) | The premium grain. 3M Cubitron II, Klingspor Red Ceramic, Pferd ceramic — quoted as premium across r/Welding and Practical Machinist. Self-fracturing engineered grain shape |
| Silicon carbide (SiC) | Non-ferrous metals, paint feathering, glass, marble, stone, plastic, fibreglass | Steel (wears fast on ferrous) | The wet/dry standard. Black colour on most discs. Used in automotive paint prep and clear coat finishing |
| Diamond / CBN | Concrete, stone, marble, granite, tungsten carbide, hardened tool steel above HRC 65 | Mild steel, wood (overkill cost) | The specialty class. Premium CPC commercial-intent keywords reflect concrete grinding demand |
| Garnet | Wood specialty — gives a smooth burnished finish | Metal (wears too fast) | Niche woodworking — Mirka, Festool ranges. Replaced by aluminium oxide for most modern work |
The forum-validated practical mill scale example from r/Welding ("Preferred way to handle mill scale" — 300+ comments): "I just end up using sanding discs cubic zirconia or ceramic grinding media on the pads definitely not the aluminum oxide those wear out way too..." Mill scale (the dark oxide layer on hot-rolled steel) is hard. Aluminium oxide rounds over quickly; zirconia or ceramic cuts cleanly and lasts.
Aluminium oxide — the workshop default
Aluminium oxide is the workhorse abrasive grain. It cuts wood, soft metals, mild steel for light work, and paint. It's cheap, widely available, and forms about 70% of AIMS sanding disc inventory. Bossweld, Pferd, Norton, Trax, Maxigear, Linishall — all stock heavy aluminium oxide ranges.
Two limitations: it wears fast on hard or stainless steel (the grain rounds rather than fractures), and the loading/clogging from soft metals like aluminium is significant unless the disc has an anti-clog (stearate) coating.
Anti-clog (stearate) coating — many aluminium oxide discs sold for paint stripping and aluminium work have a white stearate layer over the abrasive. This stearate (typically zinc stearate or calcium stearate) is a soft soap-like compound that prevents the abrasive from gumming up with paint or soft metal swarf. Discs with stearate coating last 3-5× longer on aluminium and paint work than uncoated. Look for "anti-clog" or "non-loading" or "stearate" in the product name.
Zirconia alumina — the mild steel grinder
Zirconia is the engineered alloy of zirconium oxide and aluminium oxide. The grain has a unique microstructure that fractures into fresh sharp edges as it wears — self-sharpening behaviour that ordinary aluminium oxide doesn't have. The result is 3-5× longer life on steel grinding versus aluminium oxide, faster stock removal, and cooler cutting (less heat transfer to the workpiece).
Zirconia is the preferred grain for fibre disc work on mild steel. Pferd Resin Fibre Disc - Zirconia, Klingspor Red Ceramic Fibre Disc, 3M Cubitron II ceramic and Norton SG ceramic discs all play here. For mild steel weld dressing, structural steel surface prep, and heavy stock removal, zirconia is the trade-tier choice.
Ceramic alumina — the premium grain
Ceramic alumina is the engineered grain technology of the last 30 years — pioneered by 3M (Cubitron) and adopted by Klingspor (Red Ceramic), Norton (SG), Pferd, Sia Abrasives and most premium manufacturers. The grain is engineered with controlled fracture geometry — as the cutting edge dulls, it microfractures to expose a fresh sharp edge, maintaining cut rate throughout the disc's life.
Ceramic alumina is the right grain for stainless steel, hardened tool steel, Inconel, titanium, hard chrome and weld zones. It costs more per disc than aluminium oxide or zirconia but the cost per work area is competitive because the disc maintains cut rate. Forum reality from r/woodworking ("3M Cubitron Not Surviving 30 Minutes of Sanding" 170+ comments): premium ceramic still loses to operator error — pressing too hard burns out any disc.
Klingspor Red Ceramic Fibre Disc for Steel/Stainless Steel FS964 is the AIMS-stocked example. AIMS also carries Pferd ceramic, Norton ceramic discs. Sia Abrasives (Swiss) and Mirka (Finnish) make premium imported ceramic ranges sourced through specialty supplier networks.
Silicon carbide — the non-ferrous and paint specialist
Silicon carbide is harder than aluminium oxide but more brittle. It cuts non-ferrous metals (aluminium, brass, copper, lead), paint, plastic, fibreglass, glass, marble and stone effectively but wears fast on ferrous metals because the grain shatters rather than abrades. The black colour on most discs and sandpapers is silicon carbide.
Automotive body shops use silicon carbide discs for paint feathering between primer and topcoat — the grain produces a smooth, scratch-free finish that aluminium oxide can't match on soft paint film. Wet/dry sandpaper (the kind used for clear coat polishing) is silicon carbide. P-grade automotive paint paper is typically silicon carbide above P600.
Diamond and CBN — the superhard specialty
Diamond abrasive (synthetic industrial diamond) cuts what nothing else can: concrete, stone, marble, granite, ceramic, glass, tungsten carbide, and tool steel above HRC 65. The premium commercial-intent CPC on "concrete sanding disc" search keywords reflects demand from concrete polishers and stone fabricators.
CBN (cubic boron nitride) is diamond's near-equivalent for ferrous materials — diamond reacts with iron at high temperature, so for hardened tool steel sharpening, CBN is preferred. AIMS doesn't stock the specialty diamond/CBN disc range — sourced through dedicated diamond tool distributors. For concrete-cutting demand, the Diamond Blade Guide covers wet/dry concrete cutting at our Diamond Blade Guide.
Backing types — paper, film, cloth, fibre, mesh
The backing carries the abrasive grain. Different backings give different flexibility, durability, water resistance and tear resistance.
| Backing | Properties | Best for |
|---|---|---|
| Paper (A/B/C/D weight) | Cheapest, most flexible. A-weight thinnest, D-weight heaviest. Tears easily under heavy load. Not water-resistant | General sanding, fine finish work, hand sanding. The default for orbital sander discs |
| Film (polyester) | Thin, very flat, no tearing, excellent grit retention, water-resistant | Premium finish work, automotive paint prep, anywhere extreme flatness matters (Festool/Mirka style) |
| Cloth (J/X/Y weight) | Tear-resistant, flexible. J-weight most flexible, Y-weight heaviest. Reusable in some forms | Heavy contour work, finishing where backing flexibility matters, sanding belts |
| Vulcanised fibre / resin fibre | Rigid, very durable, semi-flexible. The "fibre disc" backing material | Heavy angle grinder work, mill scale, weld dressing, structural steel — requires backing pad |
| Mesh / Abranet (open weave) | Open mesh structure for dust extraction — every hole pulls dust | Random orbital sander with dust extraction — Mirka Abranet, Festool Granat mesh range. r/BeginnerWoodWorking top quote: "Mirka abranet is great when paired with good dust collection" |
| PolyVac / floor disc | Heavy disc for floor sanding machines | Hardwood floor sanding, parquet refinishing — Pferd PolyVac range |
Hook-and-loop vs PSA — the attachment decision
The two dominant attachment methods are hook-and-loop (Velcro-style with hooks on the backing pad and loops on the disc) and PSA (pressure-sensitive adhesive, where the disc has a sticky back like a sticker). Both have legitimate use cases — but the forum-validated decision is increasingly toward hook-and-loop for workshop use.
| Feature | Hook-and-loop (Velcro) | PSA (adhesive) |
|---|---|---|
| Cost per disc | Higher | Lower |
| Disc reusability | Yes — peel off, swap grit, refit | No — single use, peel and discard |
| Grit-swap speed | Seconds | Slower — requires backing surface clean |
| Dust extraction holes | Aligned via Velcro positioning | Aligned by sticking carefully |
| RSI / wrist injury risk | Low — minimal force to swap | Higher — peeling PSA "can cause significant repetitive stress injuries" (Garage Journal forum quote) |
| Pad wear | Hook layer wears with use; pad is replaceable | Adhesive residue can require pad cleaning |
| Heat sensitivity | Stable across normal workshop temperatures | Adhesive can soften under heavy heat from continuous use |
| Best for | Variable grit work, finishing progression, anyone changing grit often | Long single-grit production jobs, batch sanding |
The forum reality from r/woodworking ("Hook and Loop VS PSA Why so much Hook and Loop?"): hook-and-loop has won the workshop market because the time saved swapping grits compounds over a project. PSA discs are still preferred for fixed-grit production lines where the same disc grit is used for hours without change.
Why hook-and-loop pads fail (and how to extend pad life)
The #1 forum complaint pattern about hook-and-loop systems: discs falling off, pad hook layer wearing out, "sander won't hold discs." Causes ranked by forum frequency:
- Pressing too hard on the sander — r/Tools top answer (85 answers): "You don't need to press down on a sander to sand. In fact pressing down on it is what..." wears the pad and slows the motor. Sander weight is sufficient pressure.
- Cheap discs with low-quality loop layer — r/woodworking: "If you're using cheap paper, absolutely" the loop fails fast.
- Tool-specific hook-loop incompatibility — different brands use different hook density; cheaper brands (Ozito mouse sander, B&D mouse) documented losing grip after dozens of disc swaps.
- Heat from continuous use — sander pad heats up under sustained sanding; some glues soften.
- Wrong-hole-pattern disc — using a 5-hole disc on an 8-hole pad creates a gap that catches air and pulls the disc loose.
Pad replacement: most quality sanders (Festool, Mirka, Bosch, Makita) have replaceable pads. Pads should be considered a wear item — replace every 6-12 months in trade use.
Dust extraction hole patterns — 5, 6, 8, 9-hole and beyond
Modern random orbital sanders have dust extraction — a vacuum draws dust through holes in the sanding disc and pad up through the sander body to a collection bag or vacuum hose. The disc and pad must have matching hole patterns or dust extraction doesn't work.
Common patterns:
- 5-hole — older Bosch, some Makita 5" (125mm) sanders
- 6-hole — common 125mm pattern, used by older Festool ETS
- 8-hole — current 125mm trade standard. Pferd 5 Pack Hook & Loop discs typically 8-hole. AIMS Pferd disc range
- 9-hole — current 150mm (6") standard. Makita Sanding Disc 150mm 9-Hole, Diablo Multi-Hole — AIMS Pferd 6-hole and 9-hole both available
- Multi-hole (16-48+) — current premium standard. Diablo Multi-Hole, Mirka Abranet (full mesh — every hole pulls dust). Compatible with multiple sander brands
- No-hole / plain — for sanders without dust extraction. Cheaper per disc
The decision: check your sander's pad pattern before ordering bulk. Multi-hole discs work across multiple sander brands but cost slightly more than fixed-pattern discs. For Mirka Abranet (full mesh), any pad pattern works — every point pulls dust.
Disc sizes — 125mm, 150mm, 175mm, 178mm, 180mm
The two dominant disc sizes for Australian random orbital sanders are 125mm (5") and 150mm (6"). Older or larger machines use 178mm (7") or 180mm.
| Size | Sander class | Typical use |
|---|---|---|
| 75mm (3") | Pneumatic sanders, palm sanders | Spot sanding, automotive panel detail, small parts |
| 100mm (4") | Angle grinder accessories, palm sanders | Welding cleanup, deburring, angle grinder use with fibre disc backing pad |
| 125mm (5") | Most common random orbital sander | Trade workshop standard. Makita, Bosch, Festool ETS range |
| 150mm (6") | Larger random orbital, mid-grade angle grinder | Furniture making, larger surfaces, premium sander class (Festool ETS 150) |
| 175mm (7") | Industrial sanders, fibre disc on 178mm angle grinder | Heavy stock removal, marine surface prep, automotive heavy work |
| 180mm (7") | 9-inch grinders (note: 9" banned in AU; 7" is the largest legal angle grinder) | Heavy industrial — see our Angle Grinder Guide for AU regulatory context |
The 9-inch grinder ban: under AU/UK workplace safety regulations, 230mm/9" angle grinders are restricted because they exceed the maximum hand-tool grinder size for safe operator control. Most AU workshops use 100mm, 125mm or 178mm. Sanding discs at 230mm are commercial-only.
Grit progression — FEPA P-grade vs CAMI grade
"Grit" measures the size of the abrasive grain. Coarser grit = larger particles = faster stock removal but rougher finish. Finer grit = smaller particles = slower removal but smoother finish.
Two grading systems exist and they're not interchangeable:
| FEPA P-grade | CAMI grade | Approximate equivalence | Application |
|---|---|---|---|
| P40-P60 | 40-60 | ~Equivalent | Heavy stock removal, paint stripping, mill scale |
| P80-P120 | 80-100 | P-grade slightly finer | Intermediate sanding, rough levelling, between coats |
| P150-P240 | 120-180 | P-grade noticeably finer | Finish sanding, pre-paint prep |
| P320-P600 | 220-320 | P-grade much finer | Fine finish work, wood pre-finish, paint feathering |
| P800-P3000 | 400-600 | P-grade much finer | Automotive clear coat polish, very fine finish, lacquer prep |
The practical implication: FEPA P-grade discs (the automotive standard) are not the same as CAMI grade discs at the same nominal number. A "P240" automotive paint disc is finer than a "240" cabinet-grade woodworking disc. Norton, Pferd, Klingspor and most AU brands use the FEPA P-grade system. Festool and Mirka use FEPA. Cheaper imports sometimes label without specifying.
Standard grit progression strategies:
- Heavy stock removal: P40 → P80 → P120 (steel, wood roughout)
- Finish wood: P80 → P120 → P180 → P240 (cabinetry, furniture)
- Paint preparation: P80 → P180 → P320 → P600 (panel beating, body work)
- Clear coat polish: P1000 → P1500 → P2000 → P3000 (wet sanding clear coat before machine polish)
The rule: never skip more than one or two grit steps. Going from P80 directly to P240 leaves coarse scratches that the finer disc can't remove.
Fibre disc backing pad — the angle grinder setup
Fibre discs (resin fibre discs) are heavy-duty sanding discs designed for angle grinder use. They aren't flat-flexible like paper sanding discs — they're semi-rigid vulcanised fibre with abrasive bonded directly. This rigidity means they need a backing pad behind them to flex slightly during use and prevent the disc from cracking.
Norton's mounting procedure (from their YouTube training):
- Remove the original grinding disc and inner flange from the angle grinder
- Fit the rubber backing pad onto the spindle (sometimes the original inner flange is removed entirely; sometimes it stays)
- Place the fibre disc over the backing pad
- Fit the retaining nut (often a special flat nut, not the cup-style nut for grinding discs)
- Tighten with the angle grinder spindle lock
The backing pad does three things: cushions the fibre disc against grinder vibration, provides the slight flex that makes the disc cut effectively, and prevents the disc edge from cutting the spindle nut on flat-face work.
Common forum mistakes:
- Using a fibre disc without a backing pad — the disc cracks or the abrasive doesn't engage properly
- Using the wrong size backing pad — backing pad must match the disc size (115mm pad for 115mm disc, 125mm for 125mm)
- Using a grinding disc retaining nut — cup-shaped grinder nut spaces the fibre disc wrong. Use the flat (sanding) nut
- Mounting at angle — disc must sit flat against the backing pad. Cocked mounting causes vibration and disc failure
AIMS stocks Norton Fibre Disc Backing Pad 115mm and Klingspor Smooth Backing Pad for Fibre Disc ST358 — see /collections/fibre-discs.
Tool compatibility — disc to tool
| Tool | Typical disc | Attachment | Use |
|---|---|---|---|
| Random orbital sander | 125mm or 150mm with hole pattern | Hook-and-loop primarily | Fine finish sanding, paint prep, varnish work |
| Palm sander (1/4 sheet) | Triangular or rectangular | Hook-and-loop or PSA | Detail work, between cabinet stiles, restoration |
| Disc sander (bench) | 178mm (7") or 305mm (12") plain back | Adhesive backed | Edge sanding, jig work, fine joint preparation |
| Angle grinder (115mm, 125mm) | 100mm, 115mm, 125mm fibre disc | Backing pad + flat nut | Heavy stock removal, mill scale, weld dressing, paint stripping |
| Angle grinder (178mm) | 175mm, 180mm fibre disc | Backing pad + flat nut | Industrial heavy removal, large surface prep |
| Drill / drill press | 50mm to 75mm with shaft mandrel | Shaft-mounted backing pad | Occasional sanding, light deburring, hobby work |
| Die grinder | 25mm to 75mm with shaft mandrel | Shaft-mounted backing pad | Detail metal work, tight access, mould/die work |
| Belt sander | Sanding belt (continuous loop) | Tracked over rollers | Heavy stock removal on flat work — see our Belt Sander Guide |
Common sanding disc problems — the forum-validated diagnostic table
| Problem | Cause | Fix |
|---|---|---|
| Disc keeps falling off the sander | Hook layer worn; wrong hole pattern; pressing too hard wearing pad | Replace pad if hook layer worn; match disc holes to pad; r/Tools: "You don't need to press down on a sander" |
| Disc loads up / clogs fast | Aluminium oxide on paint or aluminium; no stearate coating | Switch to stearate-coated anti-clog disc; or silicon carbide on paint |
| Disc wears out in minutes | Wrong grain for material (aluminium oxide on stainless); cheap disc; pressing too hard | Apply abrasive grain golden rule — zirconia for steel, ceramic for stainless |
| Scratches won't sand out | Skipping too many grit steps | Never skip more than one grit step. Go back to coarser grit, then progress |
| Hook-and-loop pad falling apart | Cheap sander with glued-not-bonded pad; wear from heat | Replace pad (most sanders have replaceable pads). r/woodworking: "PSA, this exact same thing happened to my Black and Decker mouse sander. The hook and loop pad was glued to the foam backing" |
| Dust everywhere despite dust extraction | Disc hole pattern doesn't match pad; vacuum not strong enough; mesh better for full extraction | Match holes to pad; upgrade vacuum; consider Mirka Abranet mesh (every hole extracts) |
| Fibre disc cracking | No backing pad; pad worn out; mounted at angle | Always use matching backing pad; replace pad if worn; ensure disc sits flat |
| Burning the work / heat marks | Pressing too hard; wrong grain (aluminium oxide on stainless burns hot); dull disc | Lighter pressure; correct grain for material; replace dull disc |
| Disc rolling under at edges | Disc oversized for pad; sander tilted; soft backing pad | Match disc to pad size exactly; keep sander flat to work |
Brand reality — AIMS vs the AU and global market
| Brand | Tier | Origin | Forum / market reputation | AIMS supply |
|---|---|---|---|---|
| Pferd | AIMS dominant | German engineering | The most-stocked AU trade brand. Full hook-and-loop, fibre disc, sanding belt, PolyVac floor sanding ranges. AS-compliant. | ✓ 129 sanding disc SKUs + 75 sanding belts + 23 fibre discs = 227 across the cluster |
| Norton Abrasives | Global authority — AIMS stocked | USA — Saint-Gobain | The global abrasives reference. Speedgrip discs, Metalite, SG ceramic. Sets the industry standard. | ✓ 32 sanding discs + 8 sanding belts + 5 fibre discs = 45 across the cluster |
| Klingspor | German specialty — AIMS stocked | Germany | Forum-quoted premium. Red Ceramic Fibre Disc FS964 is the AU trade-preferred ceramic fibre disc for stainless. Smooth Backing Pad ST358 for fibre disc setup. | ✓ 30 sanding discs + 9 sanding belts + 6 fibre discs = 45 across the cluster |
| 3M (Cubitron II) | Global premium ceramic | USA — global | 3M Cubitron II ceramic alumina is the most-quoted premium grain on Reddit r/Welding and r/woodworking. Forum-tested for 30-minute sustained sanding | Not stocked — specialty automotive/industrial distributor channel |
| Sia Abrasives | Swiss premium | Switzerland | Premium FEPA P-grade. Sold at Sydney Tools, Supercheap Auto. 1815 Series heavy duty | Not stocked — automotive specialty channel |
| Mirka (Abranet) | Finnish mesh specialty | Finland | r/BeginnerWoodWorking top quote: "Mirka abranet is great when paired with good dust collection." Premium mesh disc for full dust extraction | Not stocked — specialty woodworking distributor |
| Festool | German premium tool ecosystem | Germany | Brand-tied to Festool sander platform. Granat range. Premium price | Not stocked — Festool dealer channel |
| Diablo / Bosch / Makita | Brand-tied tool consumables | USA / Germany / Japan | Bunnings/Mitre 10 tier. Brand-platform matched to cordless tools | Not stocked — retail tool chain channel |
| Trax | AU workshop value — AIMS stocked | AU brand | Workshop tier across pneumatic and abrasives | ✓ 15 sanding discs + 1 sanding belt |
| Maxigear | AU value — AIMS stocked | AU brand | Workshop tier | ✓ 13 sanding discs + 1 sanding belt |
| Linishall | AU manufacturer — AIMS stocked | AU | Specialty for bench grinder and linishing applications | ✓ 4 sanding discs + 2 sanding belts |
| Abbott & Ashby | AU workshop — AIMS stocked | AU brand | Workshop tier across welding and abrasives | ✓ 4 sanding discs + 6 sanding belts |
| Flexovit | Global abrasives — AIMS stocked | European | European brand under Saint-Gobain | ✓ 4 sanding discs |
| Bordo / Rocket | AU workshop — AIMS stocked | AU | Workshop tier | ✓ 2-3 SKUs each |
AIMS sanding disc range
AIMS stocks 371 SKUs across the abrasive disc ecosystem at the AU industrial trade tier:
Hook-and-loop sanding discs (the workshop default): Pferd Hook and Loop Sanding Disc 8-Hole range covers 125mm in P40 through P400+ grits. Pferd 5 Pack Hook & Loop Paper Discs in aluminium oxide and zirconia for production work. Linishall Self Adhesive Sanding Disc for bench disc sanders.
Resin fibre discs (angle grinder heavy-duty): Pferd Resin Fibre Disc - Zirconia for mild steel; Klingspor Red Ceramic Fibre Disc for Steel/Stainless Steel FS964 for stainless and hardened steel; Norton Metalite Maroon Aluminium Oxide Sand Fibre Disc for general work.
Sanding belts: Pferd 75 SKUs across the size range for belt sanders (75mm × 533mm, 100mm × 610mm and larger). Klingspor 9 SKUs, Norton 8, Abbott & Ashby 6 — full coverage from 60 grit to 320 grit.
Backing pads (for fibre disc): Norton Fibre Disc Backing Pad 115mm, Klingspor Smooth Backing Pad for Fibre Disc ST358.
Specialty: Pferd PolyVac Disc Paper Floor Sanding Al Oxide (for floor sanding machines), specialty grit and backing combinations for niche applications.
Not stocked at AIMS: 3M Cubitron II (specialty industrial distributor), Sia Abrasives (Swiss automotive specialty), Mirka Abranet (specialty woodworking), Festool Granat (Festool dealer), Diablo / Makita / Bosch consumables (Bunnings/retail tool chain). Call (02) 9773 0122 or visit contact us for specialty brand sourcing.
Adjacent guides: Sandpaper Grit Guide (grit numbering and grain selection — sheet/roll format), Flap Disc Guide (overlapping abrasive flap discs for angle grinder), Grinding Disc Guide (bonded grinding wheels for stock removal), Cutting Disc Guide (thin reinforced cutting wheels), Belt Sander Guide, Angle Grinder Guide (AU 9-inch grinder regulatory context), Bench Grinder Guide.
Frequently Asked Questions
What's the difference between a sanding disc and a grinding disc?
Grinding discs are thick bonded abrasive wheels used for aggressive stock removal — they grind metal away. Sanding discs are flexible (or semi-flexible) coated abrasives used for surface smoothing, levelling and finishing — they sand material away in smaller increments. Norton's framing: "Grinding discs are for aggressive removal, flap discs are slower but give a better finish, and fiber discs respect the flatness of the steel." Sanding discs sit in the finishing zone where surface quality matters more than cut rate.
What abrasive grain should I use on stainless steel?
Ceramic alumina is the right grain for stainless. The forum-validated rule from r/metalworking: "Soft metals are fine with aluminum oxide, mild steels are best with zirconia, and hardened/alloyed/stainless steel are best with ceramic." Aluminium oxide wears too fast on stainless — the grain rounds rather than fractures. Zirconia works on mild steel but underperforms on stainless. Ceramic alumina (Klingspor Red FS964, 3M Cubitron II, Pferd ceramic) maintains cut rate throughout disc life on stainless. The premium grain costs more per disc but works out cheaper per square metre.
Hook-and-loop or PSA — which is better?
Hook-and-loop wins for most workshop work. Reasons: discs are reusable (peel off, swap grit, refit), no peeling repetitive stress injury risk (Garage Journal flagged this as a real RSI cause for production PSA users), faster grit swaps, and the pad is replaceable when the hook layer eventually wears. PSA wins only for single-grit batch production where the same disc grit is used for hours without change — cheaper per disc and stable. For variable grit work, hook-and-loop is the answer.
Why do my sanding discs keep falling off?
Three forum-validated causes: pressing too hard on the sander (r/Tools top answer: "You don't need to press down on a sander to sand. In fact pressing down on it is what..."), cheap pads with weak hook layer, and mismatched hole patterns (5-hole disc on 8-hole pad creates air gap). Fix by reducing pressure (sander weight is enough), replacing the pad (most sanders have replaceable pads), and matching disc holes to pad pattern exactly.
What's the difference between FEPA P-grade and CAMI grade?
Two different grit grading systems with different scales. FEPA P-grade is the European/automotive standard (P40-P3000). CAMI grade is the US woodworking standard (40-600). They're not equivalent — at the same nominal number, P-grade is finer than CAMI above 240. A "P320" auto disc is finer than a "320" cabinet disc. AU brands (Pferd, Norton, Klingspor, Festool, Mirka) use FEPA P-grade. Most premium discs label clearly with the P prefix. Cheaper imports sometimes label without specifying — when in doubt, treat unlabeled discs as CAMI grade (coarser than they appear).
What does the stearate coating do?
Stearate (typically zinc stearate or calcium stearate) is a soft soap-like compound applied as a thin layer over the abrasive on some sanding discs. It prevents the disc from loading or clogging with soft swarf — aluminium, paint, sealer, primer. Stearate-coated discs last 3-5× longer on paint stripping and aluminium work than uncoated. Look for "anti-clog," "non-loading," or "stearate" in the product name. Especially important for automotive paint prep and aluminium fabrication.
What hole pattern do I need on my disc?
Match the disc hole pattern to your sander's pad pattern. Common patterns: 5-hole (older Bosch, some Makita 125mm), 6-hole (older Festool ETS), 8-hole (current 125mm trade standard — Pferd 8-hole range), 9-hole (current 150mm standard — Makita 9-hole). Multi-hole discs (Diablo, Mirka) work across multiple brands. For Mirka Abranet full mesh, any pad pattern works — every mesh point extracts dust. Check your sander's pad before bulk ordering.
Can I use a fibre disc without a backing pad?
No. Fibre discs are semi-rigid vulcanised fibre and need a rubber backing pad to flex slightly during use. Without the pad: the disc cracks, the abrasive doesn't engage properly, vibration increases, and the disc fails fast. AIMS stocks Norton Fibre Disc Backing Pad 115mm and Klingspor Smooth Backing Pad ST358 for proper fibre disc setup on angle grinders. Match backing pad size to disc size exactly (115mm pad for 115mm disc, 125mm for 125mm).
Why are 9-inch angle grinders banned in Australia?
Under AU/UK workplace safety regulations, 230mm/9-inch angle grinders are restricted from common workplace use because they exceed the maximum hand-tool grinder size for safe operator control. The kickback torque and disc inertia at 9" exceed what an unsupported operator can manage safely. Most AU workshops use 100mm, 115mm, 125mm or 178mm angle grinders. The 178mm (7") is the largest size legally available for hand-held use in most contexts. Sanding discs at 230mm exist for commercial-only fixed installations. See our Angle Grinder Guide for detail.
How long should a sanding disc last?
Depends on grain, material and pressure. Aluminium oxide on wood: 20-40 minutes of sustained sanding. Zirconia on mild steel: 30-60 minutes. Ceramic alumina on stainless: 30-90 minutes (the premium grain advantage). Forum reality from r/woodworking 170+ comments: even premium discs (3M Cubitron II) fail at 30 minutes if pressed too hard. The single biggest determinant is operator pressure — let the disc do the work. If a disc fails in under 15 minutes, the grain is wrong, the pressure is wrong, or the disc is cheap.
Can I use a sanding disc on concrete or stone?
For light surface prep, yes — silicon carbide discs handle some concrete and masonry work. For serious concrete grinding, no — you need diamond abrasive. The high CPC on "concrete sanding disc" search reflects commercial concrete polishing demand, which is mostly diamond-tipped tooling. AIMS doesn't stock diamond sanding discs but the cluster includes diamond cup wheels for concrete grinding via our Diamond Blade Guide coverage.
What's the best disc for paint stripping?
Aluminium oxide with anti-clog stearate coating is the standard. Silicon carbide also works well — it cuts paint cleanly without loading. For thick old paint or epoxy, a coarser grit (P40-P60) with stearate coating; for primer/topcoat removal, P80-P150. Always use a sander with dust extraction — paint dust is a respiratory hazard. See our Respirator Guide for P3 filter selection on lead paint or old paint of unknown composition.
What disc do I need for an angle grinder?
For heavy material removal: fibre disc (resin fibre) with matching backing pad. Choose grain by material: zirconia for mild steel, ceramic alumina for stainless. For finer finishing: flap disc (see our Flap Disc Guide). For aggressive grinding: grinding disc (see our Grinding Disc Guide). For cutting: cutting disc (see our Cutting Disc Guide). Sanding discs for angle grinder use are specifically fibre discs — flat sanding discs for orbital sanders don't fit angle grinder spindles.
What does "open coat" vs "closed coat" mean?
Closed coat means the abrasive grain covers ~95% of the backing surface — maximum cut rate but loads easily. Open coat means the grain covers ~50-70% of the backing — slower cut but resists loading on soft materials. Closed coat is the default for hard materials (steel, hardwood). Open coat is preferred for soft materials (aluminium, paint, sealer) where loading is the main failure mode. Most discs don't label this explicitly — open coat discs are usually marketed for "aluminium," "paint" or "non-loading" applications.
How do I extend the life of my sanding pad?
Three forum-validated practices: (1) Light pressure only — r/Tools top quote: "You don't need to press down on a sander to sand. In fact pressing down on it is what..." wears the pad and slows the motor. (2) Match disc hole pattern to pad to avoid the air-gap-pulls-disc-off problem. (3) Replace the pad as a consumable — most quality sanders (Festool, Mirka, Bosch, Makita) have replaceable pads sold as service parts. In trade use, pads typically last 6-12 months. Cheap sanders with glued-not-bonded pads will fail earlier — r/woodworking documented Black & Decker mouse sander pad-foam delamination.