Spiral flute tap for stainless steel

Core Advantages

1. Large-angle spiral flute design for smooth upward chip evacuation
   Upward helical flutes lift long, tough stainless steel chips out of blind holes completely, no residual chips stuck at hole bottom to lock or snap taps. Exclusively for blind hole processing, forming taps are not recommended for stainless steel.
2. HSS-E M35 cobalt substrate / Powder metallurgy HSS optional
   5% cobalt high-speed steel delivers outstanding red hardness and thermal resistance, resisting softening under high cutting heat generated by poor thermal conductivity of stainless steel. High toughness reduces tap breakage during heavy-load tapping.
3. Multiple professional anti-adhesion coatings for stainless steel

• TiCN Rainbow Coating: High hardness & wear resistance, universal choice for 304 stainless steel
• Special SUS Composite Anti-Stick Coating: Ultra-low friction, suppress built-up edge for long continuous tapping
• TiAlN Coating: Excellent high-temperature oxidation resistance, for hard & high-tensile stainless steel
  ❌ Ordinary golden TiN coating not recommended for stainless steel, prone to material galling and fast abrasion.

4. Precision fully ground thread & optimized cutting geometry
   Custom rake/relief angles matched to stainless steel’s high ductility, lower tapping torque, produce smooth, burr-free threads with standard 6H tolerance. Stable dimensional consistency for batch precision parts.
5. Wide size & standard coverage
   Metric coarse/fine thread (M2–M24), UNC/UNF inch taps available, complies with DIN371, DIN376, ISO standards. Custom non-standard sizes & left-hand taps supported.

    

   

    

   Compatible Machining Materials

   ✅ SUS303, SUS304, SUS316, SUS316L Austenitic Stainless Steel

    

   ✅ Duplex stainless steel, chrome-moly alloy steel

    

   ✅ Low-alloy viscous steel with work-hardening tendency

    

   Recommended Tapping Operation Guidelines

   1. Spindle speed: Keep at 50%–70% of the speed used for medium carbon steel to reduce heat & work hardening
   2. Cutting fluid: Use sulfurized chlorinated extreme pressure tapping oil, regular machine oil is forbidden
   3. Bottom hole: Enlarge hole diameter by 5%–10% compared to standard carbon steel hole size to lower tapping resistance
   4. Operation tip: Retract tap regularly to clear accumulated chips during deep blind hole tapping

   Send inquiry for full catalog, technical tapping data sheet & factory quotation. Custom machining solution consultation is available 24/7.