Tap Drill Sets

Tap Drill Set Selection — Quick Reference

Tap drill sets — PRE-MATCHED tap + drill pairs for clean threaded hole cutting. Workshop + maintenance + fabrication. Includes tap (cutting + finishing) + correct tap drill bit (specific to thread + pitch). Saves lookup + ordering time.

Critical: Use CUTTING FLUID — see cutting lubricants for tap life + clean threads. See threading tap size chart for tap drill lookup. Brands: Sutton Tools, P&N. Companion: taps, drill bits, threading.

Tap Drill Sets for Australian Workshop Thread Cutting

Tap drill sets combine taps with their matching tapping drill bits in coordinated kits — eliminating the time and error of separately sourcing the right drill for each tap size. For Australian fitters, mechanics, and trade workers cutting threads, the right tap drill set has both components on hand without searching for the matching drill in a separate set. AIMS Industrial supplies tap drill sets in metric and imperial sizes from Sutton Tools, Bordo, and Champion.

What's in a tap drill set

A standard tap drill set typically includes:

• Hand taps in matching sizes (taper, intermediate, and bottoming for each thread size)
• Matching HSS drill bits sized at the correct tap drill size for each thread
• A tap wrench (for hand-tapping work)
• A hard case with labelled positions for organised storage

Common metric sets cover M3 through M12 (the everyday workshop range). Larger sets extend to M20 or beyond. Imperial sets cover the corresponding UNC and UNF sizes.

Why tap drill sets earn their place

• The right drill always on hand — no searching the drill set for the matching tap drill
• Reduced thread errors — using the wrong drill produces oversized or undersized threads; the matched set eliminates this
• Faster setup — particularly for service and repair work where threading isn't routine
• Apprentice and training kits — the matched set teaches correct tap-drill pairing

Tap drill sizing — the basic principle

Standard practice for thread cutting is to drill at a size that produces approximately 75% thread engagement — strong enough for most applications, easy enough to cut. Common metric tap drill pairings:

• M3 → 2.5mm drill
• M4 → 3.3mm drill
• M5 → 4.2mm drill
• M6 → 5.0mm drill
• M8 → 6.8mm drill
• M10 → 8.5mm drill
• M12 → 10.2mm drill

For higher thread engagement (stronger threads in critical applications), drill closer to the tap's minor diameter. For easier tapping in tough materials, drill slightly larger. Tap drill charts cover the range; tap drill sets pre-pair the standard 75%-engagement combinations.

Where tap drill sets earn their place

• Service and maintenance work — chasing damaged threads, cutting fresh threads in repair situations
• Workshop fitting and toolmaking — daily tapping work where varied sizes come up
• Apprentice training — teaching correct tap-drill pairing
• Site work — having matched tap and drill on hand for installation work

Tapping practice

Drill the hole to the correct tapping drill size (use the matched drill from the set). Use a quality tapping fluid (Tap Magic or Molycut for cutting fluid). Keep the tap square to the work. Back off every half turn to break the chip — particularly important on smaller taps where chip jams cause breakage. For deeper threads, the taper-then-bottoming sequence handles the work.

Brands stocked at AIMS

Sutton Tools, Bordo, and Champion cover the tap drill set range in HSS. Sets are typically supplied in hard cases with each tap and drill in labelled positions. For specialty thread forms or non-standard sizes, individual taps and drills are stocked separately.

Companion ranges at AIMS

Tap drill sets sit alongside our broader threading tool range — see metric hand taps, spiral flute taps, threading tools, and multi-purpose drill bits for the related products.

Need help speccing tap drill sets for trade or workshop use? contact our team — we'll match by size range and brand.