Bordo – 1/4″ x 18 NPT Bottoming HSS Tap

Description

1/4″ x 18 NPT Bottoming HSS Tap
HSS NPT Bottoming Hand and Machine Tap.
National Pipe Tapered is a US standard for tapered threads used to join pipes and fittings. ANSI/ASME standard B1.20.1 covers threads of 60º form with flat crests and roots. The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other. However a clearance remains between the crests and roots of the threads, resulting in a leakage around this spiral. This means that NPT fittings must be made leak free with the aid of thread seal tape or a thread sealant compound. For each 12″ increase in distance from the end, the diameter increases by 3/4″.
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.
Category: Bordo, Taps & Dies, HSS Hand and Machine Taps, HSS Tap NPT
Drill Diameter (mm): 11.1
Overall Length (mm): 67
Pitch (tpi): 18
Lead: Bottoming