Bordo 4252-1/4B 1/4" x 18TPI NPT Bottoming Chrome Alloy Tap

Bordo 4252-1/4B 1/4" x 18TPI NPT Bottoming Chrome Alloy Tap

NPT is a US standard for tapered threads used to join pipes and fittings. ANSI/ASME standard B1.20.1 covers threads of 60° 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.

Features:

• National Pipe Tapered
• ANSI/ASME standard B1.20.1 covers threads of 60° form with flat crests and roots
• Allows them to form a seal when torqued as the flanks of the threads compress against each other
• 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.

Specification:

• Diameter: 1/4"
• Pitch: 18TPI
• Lead: Bottoming
• Length: 62mm
• Tapping Drill: 11.1mm