Tap Chart UNC UNF Threads Tap size 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 5 8 11 UNC 11 6250 5660 5135 5266 17 32 5 DRILL SIZE DECIMAL EQUIVALENT amp TAP DRILL CHART DECIMAL EQUIVALENT CHART DRILL DECIMAL SIZE MM EQUIVALENT – 0 10 0039 – 0 20 0079 – 0 25 0098 – 0 30 0118 80 0 34 0135 10 – 24 25 69 – 75 5 8 – 11 17 32 75 – 79 TAP DRILL CHART PHONE 1 800 558 2808 FAX 1 800 553 8769 WEB www imperialsupplies com Imperial has made a tap drill diameters for thread cutting nominal size 248 d1 unc unf unef unjc unjf m mf mj npsm npsc npsf rp 0 1378 3 500 8 32 unc 8 36 unf 8 32 unjc m4x0 5 0 1406 9 64 28 3 571 0 1417 3 600 8 36 unjf lk unc 8 32 nominal size 248 d1 unc unf Screw O D Tap Close Fit Free Fit Size Thread Decimal Size Decimal Size Decimal Size Decimal 000 120 0 0340 quot 71 0 0260 quot 65 0 0350 quot 62 0 0380 quot 00 Thread Size Tap Drill Sizes Clearance Holes Size DIA Close Fit Non Struct 1 64 OS 0 80 UNF 3 64 0469 No 53 5 64 1 64 UNC No 53 0595 No 49 No 43 1 72 UNF

Machine Screw and Drill Size Chart English Clearance Hole Drills Screw Designation Tap Drill Size Close Fit Loose Fit Number Diameter Pitch Tap Size Drill Diameter Drill Diameter Drill Diameter or dia inch threads inch Size inch Size inch Size inch 0 0 06 80 0 80 3 64 0 0469 52 0 0635 50 0 07US Tap and Drill Bit Size Table Print this page Tap Fractional Drill Bit Number Drill Bit Letter Drill Bittap drill sizes cont pipe thread drilled hole sizes tap size cutting taps tru flo ™ forming taps inch metric drill size decimal equivalent drill size decimal equivalent 3 4 10 21 32 6562 45 64 7031 3 4 16 11 16 6875 23 32 7188 m20 x 2 50 17 50mm 6890 m20 x 1 50 18 50mm 7283 m22 x 2 50 19 50mm 7677 m22 x 1 50 20 50mm 8071 7 8 9 49 64 Tap threads for left hand threaded fasteners Made of uncoated high speed steel these taps are durable enough for small scale tapping jobs but they re not recommended for production use All have a square shank that s compatible with tap wrenches and tap holders for drill presses and milling machines Taper chamfer taps have 7 10 chamfered threads at the tip for cutting into 49 rows nbsp 0183 32 To help my readers out I thought I would add this quick reference chart This should help whenever you run into a situation you need to drill a pilot hole and are not sure the size bit I also have included the chart for drill bit size per tap size In case you need to drill a hole and thread it for a screw or bolt

Forming Tap Drill Sizes printable chart downloads at the bottom of the page Buy American for a Better America We are Proudly American Made for 119 years We support the Made in the USA movement Buying American made products benefits us all and makes the USA a stronger country We encourage all to build and buy American Made Tap Chart Form Threads Tap size Drill size 0 80 54 1 64 1 7mm 1 72 1 7mm 2 56 5 64 2 64 2mm 3 48 43 3 56 2 3mmThe tap size chart is providing the list of standard size taps with the diameter and thread spacing It is meant for fractional metric and screw sizes Get to know 8 32 tap drill 10 32 tap drill and 6 32 tap drill size from the page Customers will be able to buy the right kind of hardware by analyzing the tap drill size 3 8 32 11 32 3438 341 349 375 Tap Size Cut Tap Drill Roll Tap Drill Minor 216 Major 216 M1 6 x 35 1 25 0492 1 45 0571 1 221 1 321 0481 0520 1 6 0630Tap amp Clearance Drill Sizes Tap Drill Clearance Drill Screw Size Major Diameter Threads Per Inch 0 578 19 32 0 594 5 8 0 625 41 64 0 641 21 32 0 656 3 4 0 750 49 64 0 766 1 1 1 1 64 1 0156 Screw Size mm Thread Pitch mm Drill Size mm Closest American Drill Drill Size mm Closest American Drill Drill Size mm Closest