Buy Metric Thread Forming Taps Online in Australia
Metric Thread Forming Tap Selection — Quick Reference
Thread forming taps (also called fluteless taps or cold-form taps) FORM threads by displacement — NOT cutting (no chips produced). Stronger threads than cut taps in ductile materials (aluminium + brass + copper + mild steel + galv). No chip clearance issues + better surface finish.
| Tap Spec | Best For | Notes |
|---|---|---|
| HSS Thread Forming Tap (Standard) | Mild steel + aluminium + brass + copper | Workshop default — economic + reliable |
| HSS Cobalt Thread Forming Tap (M35/M42) | Stainless steel + tough alloys | Higher hardness + heat resistance |
| TiN-Coated Thread Forming Tap | Production + extended tool life | Yellow gold colour — extends life ~2-3× |
| TiCN / TiAlN Coated | Hardened ductile materials + production | Premium coating for higher-volume use |
| Metric Coarse Sizes (M3-M16+) | Standard workshop sizes | M3 / M4 / M5 / M6 / M8 / M10 / M12 typical |
| Metric Fine Sizes (M6 × 0.75 etc) | Precision + aerospace + automotive | Match thread pitch to spec |
| Form Tap with Lube Grooves | Heavy-duty + sustained production use | Lubricant flows down to thread-forming zone |
Critical drill size difference: Thread FORMING uses a LARGER tap drill than thread CUTTING — material displaces (not removes) — so the starting hole is bigger. For M6 cut tap = 5.0mm drill; M6 FORM tap = 5.6mm drill (specific to spec). Wrong drill = stripped thread OR tap breakage. Materials that form well: aluminium + brass + copper + galv + mild steel ≤300 HB hardness. NOT suitable for cast iron + hardened steel + brittle materials (no plastic deformation possible). Use cutting fluid — forming generates significant heat. Brands: Sutton Tools, Bordo, OSG, Yamawa. Companion: taps, threading, tap + die sets, threading tap size chart.
People Also Ask — Metric Thread Forming Taps
Q: How is a thread forming tap different from a cutting tap?
Thread forming taps don't cut chips — they cold-form the thread by displacing material around the lobes of the tap. The result is a chip-free threading process, threads 30-40% stronger than cut threads (the grain flows around the thread rather than being severed), and zero risk of chips jamming and snapping the tap. The trade-off: thread forming only works in ductile materials, not brittle ones.
Q: Which materials can be thread-formed?
Aluminium, copper alloys, brass, low-carbon mild steel, austenitic stainless steel (304, 316), and other ductile metals form well. Cast iron, hardened steel above about 35 HRC, and brittle materials (some bronzes, high-carbon tool steel) cannot be thread-formed — they'll fracture rather than displace, breaking the tap. If unsure, run a test in scrap before committing to thread-forming a production batch.
Q: Do thread-forming taps need a different drill size than cutting taps?
Yes — typically the tap drill is slightly larger because the material is displaced, not cut away. Manufacturer's tap-drill charts for forming taps publish specific sizes (often called 'form tap' drill size). For example, an M8 cutting tap uses 6.8mm drill; the M8 forming tap typically uses 7.4-7.5mm drill. Using the cutting-tap drill size with a forming tap causes excess displacement and tap breakage.
Q: Do I need cutting fluid for thread forming?
Yes — even though no chips are produced, the displacement work generates heat and friction. Use a thread forming oil specifically formulated for forming taps; standard cutting oil works but forming-specific fluids contain extra lubricants for the displacement action. Aluminium thread forming particularly benefits from a dedicated forming fluid to prevent built-up edge and surface tearing.
Q: Are thread-forming taps worth the extra cost?
For production threading in suitable materials, yes — the elimination of chip jamming, stronger threads, and longer tool life (no cutting edges to wear) typically pay back the higher tap cost within hundreds of threads. For occasional workshop threading, cutting taps remain the more flexible choice — they handle all material types and don't require precise drill-size selection. Choose based on volume and material consistency.