THREADSCREW - Drill & Tap Chart Machine Screw Size Threads Per Inch Minor Dia Tap Drills Clearance Hole Drills Alum, Brass, & Plasitcs 75% Thread Stainless Steel, Steels & Iron 9/16-18 UNF 18 .5625 .5264 .4943 .5024 33/64 5/8-11 UNC 11 .6250 .5660 .5135 .5266 17/32 5/8-18 UNF 18 .6250 .5869 .5568 .5649 37/64 Seethis table for diameters of twist drills. I 32 9⁄ 16″ 5⁄ 16″ 0.3125 P 18 F 24 3⁄ 8″ ¼″ 0.25 F 11⁄ 16″ 0.68753 11⁄ 16 24 — ¾″ 0.75 ¾ 10 21⁄ 32″ 16 20 14,18,24 1 1⁄ 8″ 13⁄ 16″ 0.8125 13⁄ Tapsize. NF/NC UNF/UNC: Threads per inch. Basic major dia (inches) Basic effective dia (inches) Basic minor dia of ext. threads (inches) Basic minor dia of int. threads (inches) TapDrill Sizes for 9/16 - 18 UNF. If not specified, assume a thread depth of 75%. You See more 716-20 unf 20 .4375 .4050 .3762 .3834 25/64 1/2-13 unc 13 .5000 .4500 .4056 .4167 27/64 1/2-20 unf 20 .5000 .4675 .4387 .4459 29/64 9/16-12 unc 12 .5625 Tapsize NF/NC UNF/UNC Threads per inch Basic major dia (inches) Basic effective dia (inches) Basic minor dia of ext. threads (inches) Basic minor dia of int. threads (inches) Drill size 0-80 UNF 80" .0600" .0519" .0447" .0465" 3/64" 1-64 UNC 64" .0730" .0629" .0538" .0561" #54 2-56 UNC 56" .0860" .0744" .0641" .0667" TapDrill Sizes Unified Unified Coarse Thread Thread Size mm Inch Thread Size mm Inch 1 - 64 UNC 1.50 53 0 - 80 UNF 1.25 3/64" 5/16" - 18 UNC 6.80 F 1/4" - 28 UNF 5.50 3 3/8" - 16 UNC 8.25 5/16" 5/16" - 24 UNF 6.90 I 7/16" - 14 UNC 9.65 U 3/8" - 24 UNF 8.50 Q TapSize TPI Tapping Drill mm 1/16* 60 1.2 3/32* 48 1.85 1/8 40 2.55 5/32* 32 3.2 3/16 24 3.7 7/32* 24 4.5 1/4 20 5.1 5/16 18 6.5 3/8 16 7.9 7/16 14 9.3 1/2 12 10.5 9/16 12 12.1 5/8 Vay Nhanh Fast Money.

9 16 18 unf tap drill size