PipeThread Drilled Hole Sizes Drill sizes given are the ‘closest’ drill size. NOMINAL SIZE NPT NPTF NPSC NPSM NPSF NPSI BSPT BSPP 1/16 - 27 D (0.246) D 1/4 - 19 0.4375 0.4531 3/8 - 18 0.5625 0.5781 0.5781 0.6093 0.5781 0.5781 3/8 - 19 0.5781 0.5937 1/2 - 14 0.7031 0.7031 0.7187 0.75 0.7187 0.7187 0.7187 0.7343 5/8 - 14 0.8125

38 NPT : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more.
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
34 0.7500 49/64 0.7656 25/32 0.7812 13/16 0.8125 53/64 0.8281 27/32 0.8438 7/8 0.8750 57/64 0.8906 29/32 0.9062 15/16 0.9375 61/64 0.9531 31/32 0.9688 1 1.0000 1-1/64 1.0156 1-1/32 1.0313 Screw Size Close Fit Free Fit No. or Diameter Diameter Equivalent Drill Size Decimal Equivalent Drill Size Decimal Equivalent Clearance Hole Drill Chart

TapDrill Sizes Charts; GLOSSARY; LEARNING Menu Toggle. How to Use the Machining Doctor; Machining Doctor Classroom; G-Codes; Dryseal Pipe Threads (NPTF) British Pipe Threads (BSP) ACME Trapezoidal Threads; Materials Menu Toggle. 3-8 NPT : 3.5 : 8 : 3.452 - 3.467 : 3.3786 - 3.3862

TapDrill Size Calculator; THREADPRO ; LITERATURE. Catalogs; Brochures; Literature Request; OSG Shape It; LOGIN; News; THREAD MILLING AT-1 SERIES AT-2 SERIES EXOPRO® DRILLING 3/8-18 NPT PIPE TAP TiN: 264: 1310408: 3/8-18 NPT PIPE TAP TiCN: 188: 1310500: 1/2-14 NPT PIPE TAP: 102: lineunder the tap drill diameter will show the thread tap size & thread series and form. If a controlled minimum tap depth or tight joint min. length is to be shown, the depth of minimum For hydraulic fittings, use 1/8 NPTF tap drill – Ø .339 For grease fittings with .125-27 NPTF thread, tap .125-27 NPSF to .31 for minimum full depth
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    • 3 8 npt thread drill size