Tools & Gear Taps & Dies HSS-Co5 Spiral Flute Taps

AK08AF2 5/32" x 32 BSW Spiral Flute HSS-Co5 Tap - Goliath HSS-Co (Cobalt) Bright Finish BSW Spiral Flute Machine Tap. HSS-Co Spiral Flute Taps. Spiral Flute taps are designed primarily for machine tapping of blind holes. They are used to the best advantage in materials that produce long continuous chips. The right hand spiral forces the swarf out of the hole and prevents the chips from clogging at the bottom of the hole or in the flutes, which could cause tap breakage or spoiled threads. British Standard Whitworth angle of thread is 55 degrees as opposed to 60 degrees in Metric and Unified threads. This thread form was developed by Sir Joseph Whitworth in 1841. The thread form has rounded roots and crests and is specified in BS84:1956. Manufactured from HSS-Co5.