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2022-11-14

Here's the English version of how to choose standard HSS taps based on workpiece material and hole depth:

Material Type	Recommended Tap Type	Notes
Soft materials (Aluminum, Brass, Plastic)	Spiral Flute Tap	Smooth chip removal, avoids clogging
Carbon Steel, Alloy Steel	Straight Flute / Spiral Flute	General-purpose, spiral flute preferred for blind holes
Stainless Steel, Hard Steel	High Helix Spiral Flute (≥35°)	Improves chip evacuation, reduces risk of breakage
Cast Iron, Powder Metal	Straight Flute Tap	Brittle chips, no need for aggressive chip evacuation

Hole Type	Hole Depth (Relative to Diameter)	Recommended Tap Type	Notes
Through Hole	≤2×D	Spiral Point Tap (Gun Tap)	Pushes chips forward, ideal for fast tapping
Blind Hole	≤1.5×D	Straight Flute / Spiral Flute	For shallow blind holes, straight flute is sufficient
Blind Hole	≥2×D	Spiral Flute Tap (35°–45° helix)	Effective chip evacuation for deep blind holes

Note: D = Nominal thread diameter (e.g., M10 means D = 10mm)

Precision Level	Application	Recommended Class
Standard Fit	General mechanical parts	H2 (2B)
Precision Fit	Sealing parts, precision assembly	H3 or tighter

Coating	Suitable Materials	Benefit
TiN	General materials	Increased wear resistance
TiAlN	Stainless/Hard steel	High temperature resistance
Uncoated	Aluminum, Brass	Reduces built-up edge and sticking

Jiangsu Xingrui Tools CO.,LTD

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FeiDa indutrial Park,Hou Xiang Town,DanYang City,Jiang Su Province,China.

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