Tools & Gear Taps & Dies HSS Hand and Machine Taps

3060-1/4TS 1/4" x 26 Brass HSS Tap Set HSS BSB Hand and Machine Tap Set. British Standard Brass (BSB or simply "Brass"). Brass tubing has a uniform wall thickness, irrespective of the tube diameter, therefore any thread cut on, or in, it needs to have the same depth, so 26 TPI is standard on all BSB diameters. BSB is often confused with BS Cycle thread, the difference being that brass thread has an angle of 55° whereas Cycle is 60°. Bottoming Taps have a lead of two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole. Intermediate Taps have a lead of four threads and are used in most general purpose applications to cut a thread true to a pre-drilled pilot hole. Taper Taps have a lead of eight threads and are used as a starting tap in difficult or high precision holes. Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use.