Tap Drill Size Chart
Bolt Size Drill Size Closest Fractional Decimal (in) Decimal (mm) 9mm-1.25mm 7.9mm – 0.311 7.899 9mm-1.00mm 8.1mm – 0.319 8.1 9mm-0.75mm 8.3mm – 0.327 8.301 9/16-18 NF 33/64″ 33/64″ 0.516 13.096 9/16-12 NC 31/64″ 31/64″ 0.484 12.304 8mm-1.25mm 6.9mm 17/64″ 0.272 6.899 8mm-1.00mm 7.1mm – 0.28 7.099 8-40 NS #28 – 0.141 3.569 8-36 NF … Read more