Tools & Gear Taps & Dies HSS Hand and Machine Taps

3048-2B 2" x 11 BSPT Bottoming HSS Tap HSS BSPT Bottoming Hand and Machine Tap. British Standard Pipe Taper (RC Series Pipe Taper) is based on the Whitworth thread form - a symmetrical V-thread with an angle of 55°. BSPT has been widely adopted internationally for interconnecting and sealing pipe ends by mating an external (male) with an internal (female) thread. The thread diameter increases along the length of the thread allowing the coupled pipes to form a seal when torqued as the flanks of the threads compress against each other. The taper is "1 to 16", meaning that for each 16 mm increase in the distance from the end, the diameter increases by 1 mm. Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use.