Dormer M Machine Tap Spiral Flute 40 , Pack of 1

HSS-E-PM Premium Powder Metal substrate provides superior abrasion resistance and edge strength 40 degree helix and specific rake designed for excellent performance when threading blind holes Back taper facilitates chip evacuation, reducing chipping on the last threads of the taps and also reducing torque when tap reverses Super B coating is a low friction and self lubricating hard coating which prevents built-up-edge and provides very high wear resistance Special flute geometry prevents nest formation of swarf, reducing the risk of re-cutting swarf on reversal