Threads by size

Major diameter and pitch. Tap a size for its minor diameters, tap drill, clearance hole and the threads it's easy to mix it up with.

ISO metric coarse

• M1.6Ø1.6 mm, 0.35 mm pitch
• M2Ø2 mm, 0.4 mm pitch
• M2.5Ø2.5 mm, 0.45 mm pitch
• M3Ø3 mm, 0.5 mm pitch
• M4Ø4 mm, 0.7 mm pitch
• M5Ø5 mm, 0.8 mm pitch
• M6Ø6 mm, 1 mm pitch
• M8Ø8 mm, 1.25 mm pitch
• M10Ø10 mm, 1.5 mm pitch
• M12Ø12 mm, 1.75 mm pitch
• M14Ø14 mm, 2 mm pitch
• M16Ø16 mm, 2 mm pitch
• M18Ø18 mm, 2.5 mm pitch
• M20Ø20 mm, 2.5 mm pitch
• M22Ø22 mm, 2.5 mm pitch
• M24Ø24 mm, 3 mm pitch
• M27Ø27 mm, 3 mm pitch
• M30Ø30 mm, 3.5 mm pitch
• M33Ø33 mm, 3.5 mm pitch
• M36Ø36 mm, 4 mm pitch
• M39Ø39 mm, 4 mm pitch
• M42Ø42 mm, 4.5 mm pitch
• M45Ø45 mm, 4.5 mm pitch
• M48Ø48 mm, 5 mm pitch
• M52Ø52 mm, 5 mm pitch
• M56Ø56 mm, 5.5 mm pitch
• M60Ø60 mm, 5.5 mm pitch
• M64Ø64 mm, 6 mm pitch

ISO metric fine

• M6×0.75Ø6 mm, 0.75 mm pitch
• M8×1Ø8 mm, 1 mm pitch
• M10×1.25Ø10 mm, 1.25 mm pitch
• M10×1Ø10 mm, 1 mm pitch
• M12×1.5Ø12 mm, 1.5 mm pitch
• M12×1.25Ø12 mm, 1.25 mm pitch
• M14×1.5Ø14 mm, 1.5 mm pitch
• M16×1.5Ø16 mm, 1.5 mm pitch
• M18×1.5Ø18 mm, 1.5 mm pitch
• M18×2Ø18 mm, 2 mm pitch
• M20×1.5Ø20 mm, 1.5 mm pitch
• M20×2Ø20 mm, 2 mm pitch
• M22×1.5Ø22 mm, 1.5 mm pitch
• M24×2Ø24 mm, 2 mm pitch
• M24×1.5Ø24 mm, 1.5 mm pitch
• M27×2Ø27 mm, 2 mm pitch
• M30×2Ø30 mm, 2 mm pitch
• M30×1.5Ø30 mm, 1.5 mm pitch
• M33×2Ø33 mm, 2 mm pitch
• M36×3Ø36 mm, 3 mm pitch
• M36×2Ø36 mm, 2 mm pitch
• M39×3Ø39 mm, 3 mm pitch
• M42×3Ø42 mm, 3 mm pitch
• M42×2Ø42 mm, 2 mm pitch
• M45×3Ø45 mm, 3 mm pitch
• M48×3Ø48 mm, 3 mm pitch
• M48×2Ø48 mm, 2 mm pitch
• M52×3Ø52 mm, 3 mm pitch
• M56×4Ø56 mm, 4 mm pitch
• M60×4Ø60 mm, 4 mm pitch
• M64×4Ø64 mm, 4 mm pitch

UNC

• #4-40 UNCØ2.84 mm, 40 TPI
• #5-40 UNCØ3.18 mm, 40 TPI
• #6-32 UNCØ3.51 mm, 32 TPI
• #8-32 UNCØ4.17 mm, 32 TPI
• #10-24 UNCØ4.83 mm, 24 TPI
• #12-24 UNCØ5.49 mm, 24 TPI
• 1/4-20 UNCØ6.35 mm, 20 TPI
• 5/16-18 UNCØ7.94 mm, 18 TPI
• 3/8-16 UNCØ9.52 mm, 16 TPI
• 7/16-14 UNCØ11.11 mm, 14 TPI
• 1/2-13 UNCØ12.7 mm, 13 TPI
• 9/16-12 UNCØ14.29 mm, 12 TPI
• 5/8-11 UNCØ15.88 mm, 11 TPI
• 3/4-10 UNCØ19.05 mm, 10 TPI
• 7/8-9 UNCØ22.23 mm, 9 TPI
• 1-8 UNCØ25.4 mm, 8 TPI
• 1-1/8-7 UNCØ28.58 mm, 7 TPI
• 1-1/4-7 UNCØ31.75 mm, 7 TPI
• 1-3/8-6 UNCØ34.92 mm, 6 TPI
• 1-1/2-6 UNCØ38.1 mm, 6 TPI
• 1-3/4-5 UNCØ44.45 mm, 5 TPI
• 2-4.5 UNCØ50.8 mm, 4.5 TPI

UNF

• #4-48 UNFØ2.84 mm, 48 TPI
• #6-40 UNFØ3.51 mm, 40 TPI
• #8-36 UNFØ4.17 mm, 36 TPI
• #10-32 UNFØ4.83 mm, 32 TPI
• 1/4-28 UNFØ6.35 mm, 28 TPI
• 5/16-24 UNFØ7.94 mm, 24 TPI
• 3/8-24 UNFØ9.52 mm, 24 TPI
• 7/16-20 UNFØ11.11 mm, 20 TPI
• 1/2-20 UNFØ12.7 mm, 20 TPI
• 9/16-18 UNFØ14.29 mm, 18 TPI
• 5/8-18 UNFØ15.88 mm, 18 TPI
• 3/4-16 UNFØ19.05 mm, 16 TPI
• 7/8-14 UNFØ22.23 mm, 14 TPI
• 1-12 UNFØ25.4 mm, 12 TPI
• 1-1/8-12 UNFØ28.58 mm, 12 TPI
• 1-1/4-12 UNFØ31.75 mm, 12 TPI
• 1-1/2-12 UNFØ38.1 mm, 12 TPI

BSP parallel (G)

• G1/16Ø7.72 mm, 28 TPI
• G1/8Ø9.73 mm, 28 TPI
• G1/4Ø13.16 mm, 19 TPI
• G3/8Ø16.66 mm, 19 TPI
• G1/2Ø20.96 mm, 14 TPI
• G5/8Ø22.91 mm, 14 TPI
• G3/4Ø26.44 mm, 14 TPI
• G1Ø33.25 mm, 11 TPI
• G1-1/4Ø41.91 mm, 11 TPI
• G1-1/2Ø47.8 mm, 11 TPI
• G2Ø59.61 mm, 11 TPI
• G2-1/2Ø75.18 mm, 11 TPI
• G3Ø87.88 mm, 11 TPI

BSPT taper (R / Rc)

• R1/8Ø9.73 mm, 28 TPI
• R1/4Ø13.16 mm, 19 TPI
• R3/8Ø16.66 mm, 19 TPI
• R1/2Ø20.96 mm, 14 TPI
• R3/4Ø26.44 mm, 14 TPI
• R1Ø33.25 mm, 11 TPI
• R1-1/4Ø41.91 mm, 11 TPI
• R1-1/2Ø47.8 mm, 11 TPI
• R2Ø59.61 mm, 11 TPI

NPT taper

• 1/8-27 NPTØ10.29 mm, 27 TPI
• 1/4-18 NPTØ13.72 mm, 18 TPI
• 3/8-18 NPTØ17.15 mm, 18 TPI
• 1/2-14 NPTØ21.34 mm, 14 TPI
• 3/4-14 NPTØ26.67 mm, 14 TPI
• 1-11.5 NPTØ33.4 mm, 11.5 TPI
• 1-1/4-11.5 NPTØ42.16 mm, 11.5 TPI
• 1-1/2-11.5 NPTØ48.26 mm, 11.5 TPI
• 2-11.5 NPTØ60.33 mm, 11.5 TPI

BSW Whitworth

• 1/8 BSWØ3.18 mm, 40 TPI
• 3/16 BSWØ4.76 mm, 24 TPI
• 1/4 BSWØ6.35 mm, 20 TPI
• 5/16 BSWØ7.94 mm, 18 TPI
• 3/8 BSWØ9.52 mm, 16 TPI
• 7/16 BSWØ11.11 mm, 14 TPI
• 1/2 BSWØ12.7 mm, 12 TPI
• 9/16 BSWØ14.29 mm, 12 TPI
• 5/8 BSWØ15.88 mm, 11 TPI
• 3/4 BSWØ19.05 mm, 10 TPI
• 7/8 BSWØ22.23 mm, 9 TPI
• 1 BSWØ25.4 mm, 8 TPI
• 1-1/4 BSWØ31.75 mm, 7 TPI
• 1-1/2 BSWØ38.1 mm, 6 TPI

Trapezoidal (Tr)

• Tr8×1.5Ø8 mm, 1.5 mm pitch
• Tr10×2Ø10 mm, 2 mm pitch
• Tr12×3Ø12 mm, 3 mm pitch
• Tr14×3Ø14 mm, 3 mm pitch
• Tr16×4Ø16 mm, 4 mm pitch
• Tr18×4Ø18 mm, 4 mm pitch
• Tr20×4Ø20 mm, 4 mm pitch
• Tr22×5Ø22 mm, 5 mm pitch
• Tr24×5Ø24 mm, 5 mm pitch
• Tr26×5Ø26 mm, 5 mm pitch
• Tr28×5Ø28 mm, 5 mm pitch
• Tr30×6Ø30 mm, 6 mm pitch
• Tr32×6Ø32 mm, 6 mm pitch
• Tr36×6Ø36 mm, 6 mm pitch
• Tr40×7Ø40 mm, 7 mm pitch
• Tr44×7Ø44 mm, 7 mm pitch
• Tr50×8Ø50 mm, 8 mm pitch
• Tr60×9Ø60 mm, 9 mm pitch

Acme

• 1/4-16 ACMEØ6.35 mm, 16 TPI
• 5/16-14 ACMEØ7.94 mm, 14 TPI
• 3/8-12 ACMEØ9.52 mm, 12 TPI
• 7/16-12 ACMEØ11.11 mm, 12 TPI
• 1/2-10 ACMEØ12.7 mm, 10 TPI
• 5/8-8 ACMEØ15.88 mm, 8 TPI
• 3/4-6 ACMEØ19.05 mm, 6 TPI
• 7/8-6 ACMEØ22.23 mm, 6 TPI
• 1-5 ACMEØ25.4 mm, 5 TPI
• 1-1/4-5 ACMEØ31.75 mm, 5 TPI
• 1-1/2-4 ACMEØ38.1 mm, 4 TPI
• 1-3/4-4 ACMEØ44.45 mm, 4 TPI
• 2-4 ACMEØ50.8 mm, 4 TPI