Ex 3/8 - 18 NPT - For additional dimensions, see NPT Pipe Thread Calculator. Supplements: Thread calculators and charts Reference: ANSI/ASME B1.20.1 - 1983 DrysealPipe Threads (NPTF) British Pipe Threads (BSP) ACME Trapezoidal Threads; Materials Menu Toggle. Machinability Chart; Material Standards Conversion; Thread Height Cres/ Root Tap Drill Size Lead Angle Minor Diameter Thread addendum series id #12 - 32 UNEF: 0.216: 32: 0.0313: 0.1957: 0.0169: Theproblem is the Drill size, or start diameter. I have seen recomendations to Drill with an R Drill and a Q Drill, I have seen people who Bore to .3339 only. What occurs is the Tap (not single point or Threadmill) opens up the Drilled hole, which varies by depth. Obviously. If the Minor diameter of the 'Box' isn't correct you lose the dry seal. NationalStandard Taper Pipe Threads Size NPT Chart; Internal British ISO Pipe Threads (Whitworth Form) Table per. BS EN ISO 228; Standard Taper Pipe Threads NPT Basic

Themain physical differences between NPT and NPTF are the flatness of the peaks and valleys of the threads. For the sake of our NPT tap drill chart, you simply need to know the distinction between an NPT fitting and NPTF. For example, reading across you’ll find that a 1/8 NPT tap will require an “R” size tap drill. A 3/8 NPT tap will

Thread. 3/4 – 10. 21/32. 68 – 72; 3/4 – 16. 11/16; 71 – 77. M20 x 2.5; 11/16. 74 – 78; 7/8 – 9. 49/64; 72 – 76. 3/8 – 18 NPT.7031: 45/64. 45/64: 1/2 – 14 NPT.9219: 59/64. 59/64: 3/4 – 14 NPT. Drill This Hole Size. Decimal . Inches: Drill Size. Nearest . Fraction. To Tap For This Size . Bolt or Screw.4999. 12.7 mm
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    • 3 8 npt thread drill size