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Fractional Machine Screws Tapping
And Clearance Drills Table

This table is the chart for publication of information of fractional machine screws, along with tap and clearance drill information. If all else fails, you may want to use our Drill Size Conversion Table or our Tap Drill Size Calculator. The information available from our sources is usually sufficient for all computer related drill or screw requirements world wide.

Screw Size Tapping Drills Clearance Drills
Nom. Dia. (in)Threads
/Inch
SeriesDec. Equiv. Drill Size
(65-75% thread)
Equivalents Close FitFree Fit
(decimal)(mm) Drill SizeDec. Equiv.Drill SizeDec. Equiv.
1/1664NS0.0625 3/64"0.04691.1913 520.0635510.0670
72NS 3/64"0.04691.1913
5/6460NS0.0781 1/16"0.06251.5875 460.0810450.0820
72NS 520.06351.6129
3/3248NS0.0938 490.07301.8542 410.0960400.0980
50NS 490.07301.8542
7/6448NS0.1094 430.08902.2606 340.1110320.1160
1/832NS0.1250 3/32"0.09382.3825 300.1285290.1360
40NS 380.10152.5781
9/6440NS0.1406 320.11602.9464 270.1440260.1470
5/3232NS0.1563 1/8"0.12503.1750 200.1610190.1660
36NS 300.12853.2639
11/6432NS0.1719 9/64"0.14063.5712 160.1770150.1800
3/1624NS0.1875 260.14703.7338 110.191090.1960
32NS 220.15703.9878
13/6424NS0.2031 200.16104.0894 40.209030.2130
7/3224NS0.2188 160.17704.4958 20.221010.2280
32NS 120.18904.8006
15/6424NS0.2344 100.19354.9149 C0.2420D0.2460
1/420NC0.2500 70.20105.1054 F0.2570H0.2660
24NS 40.20905.3086
27NS 30.21305.4102
28NF 30.21305.4102
32NEF 7/32"0.21885.5575
5/1618NC0.3125 F0.25706.5278 P0.3230Q0.3320
20NS 17/64"0.26566.7462
24NF I0.27206.9088
27NS J0.27707.0358
32NEF 9/32"0.28127.1425
3/816NC0.3750 5/16"0.31257.9375 W0.3860X0.3970
20NS 21/64"0.32818.3337
24NF Q0.33208.4328
27NS R0.33908.6106
32NEF 11/32"0.3438"8.7325
7/1614NC0.4375 U0.36809.3472 29/64"0.453115/32"0.4687
20NF 25/64"0.39069.9212
24NS X0.397010.0838
27NS Y0.404010.2616
28NEF 15/32"0.468811.9075
1/212NS0.5000 27/64"0.421910.7163 33/64"0.515617/32"0.5312
13NC 27/64"0.421910.7163
20NF 29/64"0.453111.5087
24NS 29/64"0.453111.5087
27NS 15/32"0.468811.9075
28NEF 15/32"0.468811.9075
9/1612NC0.5625 31/64"0.484412.3038 37/64"0.578119/32"0.5938
18NF 33/64"0.515613.0962
24NEF 33/64"0.515613.0962
27NS 17/32"0.531313.4950
5/811NC0.6250 17/32"0.531313.4950 41/64"0.640621/32"0.6562
12NS 35/64"0.546913.8913
18NF 37/64"0.578114.6837
24NEF 37/64"0.578114.6837
27NS 19/32"0.593715.0800
11/1611NS0.6875 19/32"0.593715.0800 45/64"0.703123/32"0.6562
16NS 5/8"0.625015.8750
24NEF 41/64"0.640616.4084
3/410NC0.7500 21/32"0.656216.6675 49/64"0.765625/32"0.7812
12NS 43/64"0.671917.0663
16NF 11/16"0.687517.4625
20NEF 45/64"0.703117.8587
27NS 23/32"0.718718.2550
13/1610NS0.8125 23/32"0.718718.2550 53/64"0.828127/32"0.8438
20NEF 49/64"0.765619.4462
7/89NC0.8750 49/64"0.765619.4462 57/64"0.890629/32"0.9062
12NS 51/64"0.796920.2413
14NF 13/16"0.812520.6375
18NS 53/64"0.828121.0337
20NEF 53/64"0.828121.0337
27NS 27/32"0.843721.4300
15/169NS0.9375 53/64"0.828121.0337 61/64"0.953131/32"0.9688
20NEF 57/64"0.890622.6212
18NC1.0000 7/8"0.875022.2250 1-1/64"1.01561-1/32"1.0313
12NF 59/64"0.921923.4163
14NS 15/16"0.937523.8125
20NEF 61/64"0.953124.2087
27NS 31/32"0.968724.6050
32* 31/32"0.968724.6050
1-1/1618NEF1.0625 1"1.000025.4000 1-5/64"1.07811-3/32"1.0938
1-1/87NC1.1250 63/64"0.984425.0038 1-9/64"1.14061-5/32"1.1562
12NF 1-3/64"1.046926.5913
18NEF 1-1/16"1.062526.9875
1-3/1618NEF1.1875 1-1/8"1.125028.5750 1-13/64"1.20311-7/32"1.2188
1-1/47NC1.2500 1-7/64"1.109428.1788 1-17/64"1.26561-9/32"1.2812
12NF 1-11/64"1.171929.7663
18NEF 1-3/16"1.187530.1625
1-5/1618NEF1.3125 1-1/4"1.250031.7500 1-21/64"1.32811-11/32"1.3438
1-3/86NC1.3750 1-7/32"1.218830.9575 1-25/64"1.39061-13/32"1.4062
12NF 1-19/64"1.296932.9413
18NEF 1-5/16"1.312533.3375
1-7/1618NEF1.3693 1-3/8"1.375034.9250 1-29/64"1.45311-15/32"1.4688
1-1/26NC1.5000 1-11/32"1.343834.1325 1-33/64"1.51561-17/32"1.5312
12NF 1-27/64"1.421936.1163
18NEF 1-7/16"1.437536.5125
1-9/1618NEF1.5625 1-1/2"1.500038.1000 1-37/64"1.57811-19/32"1.5938
1-5/85 1/2NS1.6250 1-29/64"1.453136.9087 1-41/64"1.64061-21/32"1.6562
18NEF 1-9/16"1.562539.6875
1-11/1618NEF1.6875 1-5/8"1.625041.2750 1-45/64"1.70311-23/32"1.7188
1-3/45NC1.7500 1-9/16"1.562539.6875 1-49/64"1.76591-25/32"1.7812
1-7/85NS1.8750 1-11/16"1.687542.8625



24 1/2NC2.0000 1-25/32"1.781345.2450



Nom. Dia. (in)Threads
/Inch
SeriesDec. Equiv. Drill Size
(65-75% thread)
(decimal)(mm) Drill SizeDec. Equiv.Drill SizeDec. Equiv.
Equivalents Close FitFree Fit
Screw Size Tapping Drills Clearance Drills
Version 1.0.1


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