1 4 unc tap size Over Wire Tap Drill Size 1 4 20 UNCPossible Thread Classes External Threads 1A 2A 3A Internal Threads 1B 2B 3B 1 4 20 UNC 1A External Permisable values for thread Class 1A Values are calculated for Length of engagement of 5xPitch For calculations of different engagement length use the Thread Calculator
P Steel M Stainless steel K Grey cast iron malleable and spheroidal iron N Aluminium and other non ferrous metal S Special super and titanium alloys UNC Coarse Major Diameter in 1 4 Threads per Inch tpi 20 Major Diameter mm 6 350 mm Tap Drill Size mm 5 35 mm Pitch mm 1 270 mm Here s an example using the chart to read the specifications for a 1 4 28 UNF thread UNF Fine Major Diameter in 1 4 Threads per Inch tpi 28 Major Diameter mm 6 350 mm
1 4 unc tap size
1 4 unc tap size
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UNC UNF UNS 2D 3D
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Taps Standards And Dimensions
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The perfect drill size for a 1 4 20 tap is a 7 drill bit with a diameter of 13 64 This size is recommended for 1 4 20 UNC tap threads When drilling harder materials such as steel or stainless steel a 7 32 drill bit may be Tap Drill Charts Unified National UNC UNF Pitch TPI Drill Size inch Pitch TPI Drill Size inch 0 80 3 64 1 64 0 059 53 72 0 059 53 2 56 0 067 51 64 0 070 50 3 48 5 64 56 0 081 46 4 40 0 089 43 48 0 093 42 5 40 0 099 39 44 0 104 37 6 32 0 106 36 40 0 113 33 8 32 0 136 29 36 0 136 29
This formula works for both metric and imperial units and for all 60 degree threads all ISO DIN UTS UNC UNS and UNF bolts The first tap drill chart below is in mm and the next in inches Both are available as a printable tap drill chart PDF as well Tap Drill Chart mm and inches Drill sizes given are the closest drill size Tap Drill Size mm Pitch mm in mm 1 64 64 0 073 1 854 1 50 0 397 2 56 56 0 086 2 184 1 80 0 453 3 48 48 0 099 2 515 2 10 0 529 4 40 40 0 112 2 845 2 35 0 635 5 40 40 0 125 3 175 2 65 0 635 6 32 32 0 138 3 505 2 85 0 794 8 32 32 0 164 4 166 3 50 0 794 10 24 24 0 190 4 826 4 00
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Calculating Tap Drill Size for M8 X 1 25 Metric Thread D 8 mm P 1 25 mm H p 65 T D 8 65 1 25 76 98 6 94 mm Calculating Tap Drill Size for UNC 1 4 20 InchThread D 0 25 T P I 20 Tooth per Inch H p 80 T D 0 25 80 76 98 20 0 198 The above examples are for cutting taps Inch sizes national coarse thread series tap size drill size 0 80 3 64 1 64 53 2 56 51 3 48 5 64 4 40 43 5 40 39 6 32 36 8 32 29 10 24 25 12 24 17 1 4 20 7 5 16 18 f 3 8 16 5 16 7 16 14 u 1 2 13 27 64 9 16 12 31 64 5 8 11 17 32 3 4 10 21 32 7 8 9 49 64 1 8 7 8 1 1 8 7 63 64 1 1 4 7 1 7 64 1 1
This resource is an essential tool providing detailed information on a vast range of tap sizes from 0000 160 to 2 4 1 2 For each size you ll find the diameter in both inches and millimeters the thread count per inch TPI the thread pitch in millimeters and the recommended tap drill size The tap size chart provides a list of standard size taps specifying the diameter and thread spacing for fractional metric and screw sizes The decimal equivalents of the diameters are shown in both English and Metric units Fractional sizes are listed in inches while metric sizes are listed in millimeters following the letter M
Tap Chart UNC UNF UNF 32 1900 1697 1517 1562 21 1 4 20 Tap
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How To Use The Drill Tap Wall Chart GD T Basics
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1 4 unc tap size - 1 1 4 7 UNC 1 25 7 0 1429 1 1572 0 0773 0 0357 1 12 2 25 1 0799 0 0464 Metric Values Classes Tolerances UNC 138 1 3 8 6 UNC 1 375 6 0 1667 1 2667 0 0902 0 0417 1 2233 2 4 1 1765 0 0541 Metric Values Classes Tolerances UNC 152 1 1 2 6 UNC 1 5 6 0 1667 1 3917 0 0902 0 0417 1 3483 2 18 1 3015 0 0541