Yes, HSS (High-Speed Steel) taps can be used for stainless steel, but with some important considerations:
HSS has good hardness, toughness, and heat resistance, which makes it capable of handling harder materials like stainless steel.
Suitable for low to medium production volumes or manual tapping where cost-effectiveness is a factor.
Use the right HSS grade:
Choose HSS-E (Cobalt HSS, like M35 or M42) taps for better heat and wear resistance. These are more suitable than regular HSS for stainless applications.
Apply proper cutting fluid:
Stainless steel tends to work-harden. Using high-performance tapping oil reduces friction and prevents tap breakage.
Control the speed and feed:
Stainless steel requires lower cutting speeds to reduce heat build-up.
Use spiral flute taps for blind holes and straight flute or spiral point taps for through holes to improve chip evacuation.