UNC

Tap Drill Size Chart — UNC (Unified National Coarse)

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UNC Tap Drill Sizes UNC (Unified National Coarse) is the default thread series in the US. If a drawing says “1/2-13” — that’s UNC. Coarse threads are stronger, more forgiving of dirty conditions, and easier to assemble than fine threads. Thread Size TPI Tap Drill Decimal (in) 75% Thread Clearance Drill #1-64 64 #53 0.0595 … Read more

Unified Screw Thread Dimensions — Coarse (UNC)

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UNC Thread Specifications This table gives the basic thread dimensions for UNC (Unified National Coarse) threads per ASME B1.1. These are the numbers you need for thread design, tolerance calculation, and thread gauge verification. Size TPI Major Ø (in) Pitch Ø (in) Minor Ø (in) Tensile Stress Area (in²) #1-64 64 0.0730 0.0629 0.0527 0.00263 … Read more