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McMaster-Carr Supply Co - Distributor for BTI Tools

MSC Industrial Supply
www.MSCDirect.com

Low Prices on Millions of Products - Global Industrial

CONVERSION CHART

inch/mm CONVERSION CHART

TO CONVERT TO MILLIMETERS: MULTIPLY INCHES X 25.4
TO CONVERT TO INCHES: MULTIPLY MILLIMETERS X 0.03937*
*FOR SLIGHTLY GREATER ACCURACY WHEN CONVERTING TO INCHES:
DIVIDE MILLIMETERS BY 25.4
INCHES METRIC INCHES METRIC INCHES METRIC
FRACTIONAL DECIMAL mm FRACTIONAL DECIMAL mm FRACTIONAL DECIMAL mm
. 0.0039 0.1000 . 0.5512 14.0000 . 1.8898 48.0000
. 0.0079 0.2000 9/16 0.5625 14.2875 . 1.9291 49.0000
. 0.0118 0.3000 . 0.5709 14.5000 . 1.9685 50.0000
1/64 0.0156 0.3969 37/64 0.5781 14.6844 2 2.0000 50.8000
. 0.0157 0.4000 . 0.5906 15.0000 . 2.0079 51.0000
. 0.0197 0.5000 19/32 0.5938 15.0813 . 2.0472 52.0000
. 0.0236 0.6000 39/64 0.6094 15.4781 . 2.0866 53.0000
. 0.0276 0.7000 . 0.6102 15.5000 . 2.1260 54.0000
1/32 0.0313 0.7938 5/8 0.6250 15.8750 . 2.1654 55.0000
. 0.0315 0.8000 . 0.6299 16.0000 . 2.2047 56.0000
. 0.0354 0.9000 41/64 0.6406 16.2719 . 2.2441 57.0000
. 0.0394 1.0000 . 0.6496 16.5000 2 1/4 2.2500 57.1500
. 0.0433 1.1000 21/32 0.6563 16.6688 . 2.2835 58.0000
3/64 0.0469 1.1906 . 0.6693 17.0000 . 2.3228 59.0000
. 0.0472 1.2000 43/64 0.6719 17.0656 . 2.3622 60.0000
. 0.0512 1.3000 11/16 0.6875 17.4625 . 2.4016 61.0000
. 0.0551 1.4000 . 0.6890 17.5000 . 2.4409 62.0000
. 0.0591 1.5000 45/64 0.7031 17.8594 . 2.4803 63.0000
1/16 0.0625 1.5875 . 0.7087 18.0000 2 1/2 2.5000 63.5000
. 0.0630 1.6000 23/32 0.7188 18.2563 . 2.5197 64.0000
. 0.0669 1.7000 . 0.7283 18.5000 . 2.5591 65.0000
. 0.0709 1.8000 47/64 0.7344 18.6531 . 2.5984 66.0000
. 0.0748 1.9000 . 0.7480 19.0000 . 2.6378 67.0000
5/64 0.0781 1.9844 3/4 0.7500 19.0500 . 2.6772 68.0000
. 0.0787 2.0000 49/64 0.7656 19.4469 . 2.7165 69.0000
. 0.0827 2.1000 . 0.7677 19.5000 2 3/4 2.7500 69.8500
. 0.0866 2.2000 25/32 0.7813 19.8438 . 2.7559 70.0000
. 0.0906 2.3000 . 0.7874 20.0000 . 2.7953 71.0000
3/32 0.0938 2.3813 51/64 0.7969 20.2406 . 2.8346 72.0000
. 0.0945 2.4000 . 0.8071 20.5000 . 2.8740 73.0000
. 0.0984 2.5000 13/16 0.8125 20.6375 . 2.9134 74.0000
7/64 0.1094 2.7781 . 0.8268 21.0000 . 2.9528 75.0000
. 0.1181 3.0000 53/64 0.8281 21.0344 . 2.9921 76.0000
1/8 0.1250 3.1750 27/32 0.8438 21.4313 3 3.0000 76.2000
. 0.1378 3.5000 . 0.8465 21.5000 . 3.0315 77.0000
9/64 0.1406 3.5719 55/64 0.8594 21.8281 . 3.0709 78.0000
5/32 0.1563 3.9688 . 0.8661 22.0000 . 3.1102 79.0000
. 0.1575 4.0000 7/8 0.8750 22.2250 . 3.1496 80.0000
11/64 0.1719 4.3656 . 0.8858 22.5000 . 3.1890 81.0000
. 0.1772 4.5000 57/64 0.8906 22.6219 . 3.2283 82.0000
3/16 0.1875 4.7625 . 0.9055 23.0000 . 3.2677 83.0000
. 0.1969 5.0000 29/32 0.9063 23.0188 . 3.3071 84.0000
13/64 0.2031 5.1594 59/64 0.9219 23.4156 . 3.3465 85.0000
. 0.2165 5.5000 . 0.9252 23.5000 . 3.3858 86.0000
7/32 0.2188 5.5563 15/16 0.9375 23.8125 . 3.4252 87.0000
15/64 0.2344 5.9531 . 0.9449 24.0000 . 3.4646 88.0000
. 0.2362 6.0000 61/64 0.9531 24.2094 3 1/2 3.5000 88.9000
1/4 0.2500 6.3500 . 0.9646 24.5000 . 3.5039 89.0000
. 0.2559 6.5000 31/32 0.9688 24.6063 . 3.5433 90.0000
17/64 0.2656 6.7469 . 0.9843 25.0000 . 3.5827 91.0000
. 0.2756 7.0000 63/64 0.9844 25.0031 . 3.6220 92.0000
9/32 0.2813 7.1438 1 1.0000 25.4000 . 3.6614 93.0000
. 0.2953 7.5000 . 1.0039 25.5000 . 3.7008 94.0000
19/64 0.2969 7.5406 . 1.0236 26.0000 . 3.7402 95.0000
5/16 0.3125 7.9375 . 1.0433 26.5000 . 3.7795 96.0000
. 0.3150 8.0000 . 1.0630 27.0000 . 3.8189 97.0000
21/64 0.3281 8.3344 . 1.0827 27.5000 . 3.8583 98.0000
. 0.3346 8.5000 . 1.1024 28.0000 . 3.8976 99.0000
11/32 0.3438 8.7313 . 1.1220 28.5000 . 3.9370 100.0000
. 0.3543 9.0000 . 1.1417 29.0000 4 4.0000 101.6000
23/64 0.3594 9.1281 . 1.1614 29.5000 . 4.3307 110.0000
. 0.3740 9.5000 . 1.1811 30.0000 4 1/2 4.5000 114.3000
3/8 0.3750 9.5250 . 1.2205 31.0000 . 4.7244 120.0000
25/64 0.3906 9.9219 1 1/4 1.2500 31.7500 5 5.0000 127.0000
. 0.3937 10.0000 . 1.2598 32.0000 . 5.1181 130.0000
13/32 0.4063 10.3188 . 1.2992 33.0000 . 5.5118 140.0000
. 0.4134 10.5000 . 1.3386 34.0000 . 5.9055 150.0000
27/64 0.4219 10.7156 . 1.3780 35.0000 6 6.0000 152.4000
. 0.4331 11.0000 . 1.4173 36.0000 . 6.2992 160.0000
7/16 0.4375 11.1125 . 1.4567 37.0000 . 6.6929 170.0000
. 0.4528 11.5000 . 1.4961 38.0000 . 7.0866 180.0000
29/64 0.4531 11.5094 1 1/2 1.5000 38.1000 . 7.4803 190.0000
15/32 0.4688 11.9063 . 1.5354 39.0000 . 7.8740 200.0000
. 0.4724 12.0000 . 1.5748 40.0000 8 8.0000 203.2000
31/64 0.4844 12.3031 . 1.6142 41.0000 . 9.8425 250.0000
. 0.4921 12.5000 . 1.6535 42.0000 10 10.0000 254.0000
1/2 0.5000 12.7000 . 1.6929 43.0000 20 20.0000 508.0000
. 0.5118 13.0000 . 1.7323 44.0000 30 30.0000 762.0000
33/64 0.5156 13.0969 1 3/4 1.7500 44.4500 40 40.0000 1016.0000
17/32 0.5313 13.4938 . 1.7717 45.0000 60 60.0000 1524.0000
. 0.5315 13.5000 . 1.8110 46.0000 80 80.0000 2032.0000
35/64 0.5469 13.8906 . 1.8504 47.0000 100 100.0000 2540.0000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THREAD/SCREW - 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

50% Thread

All Materials
Close Fit Free Fit
# or Dia Major
Dia
Drill
Size
Decimal
Equiv.
Drill
Size
Decimal
Equiv.
Drill
Size
Decimal
Equiv.
Drill
Size
Decimal
Equiv.
0 .0600 80 .0447 3/64 .0469 55 .0520 52 .0635 50 .0700
1 .0730 64 .0538 53 .0595 1/16 .0625 48 .0760 46 .0810
72 .0560 53 .0595 52 .0635
2 .0860 56 .0641 50 .0700 49 .0730 43 .0890 41 .0960
64 .0668 50 .0700 48 .0760
3 .0990 48 .0734 47 .0785 44 .0860 37 .1040 35 .1100
56 .0771 45 .0820 43 .0890
4 .1120 40 .0813 43 .0890 41 .0960 32 .1160 30 .1285
48 .0864 42 .0935 40 .0980
5 .125 40 .0943 38 .1015 7/64 .1094 30 .1285 29 .1360
44 .0971 37 .1040 35 .1100
6 .138 32 .0997 36 .1065 32 .1160 27 .1440 25 .1495
40 .1073 33 .1130 31 .1200
8 .1640 32 .1257 29 .1360 27 .1440 18 .1695 16 .1770
36 .1299 29 .1360 26 .1470
10 .1900 24 .1389 25 .1495 20 .1610 9 .1960 7 .2010
32 .1517 21 .1590 18 .1695
12 .2160 24 .1649 16 .1770 12 .1890 2 .2210 1 .2280
28 .1722 14 .1820 10 .1935
32 .1777 13 .1850 9 .1960
1/4 .2500 20 .1887 7 .2010 7/32 .2188 F .2570 H .2660
28 .2062 3 .2130 1 .2280
32 .2117 7/32 .2188 1 .2280
5/16 .3125 18 .2443 F .2570 J .2770 P .3230 Q .3320
24 .2614 I .2720 9/32 .2812
32 .2742 9/32 .2812 L .2900
3/8 .3750 16 .2983 5/16 .3125 Q .3320 W .3860 X .3970
24 .3239 Q .3320 S .3480
32 .3367 11/32 .3438 T .3580
7/16 .4375 14 .3499 U .3680 25/64 .3906 29/64 .4531 15/32 .4687
20 .3762 25/64 .3906 13/32 .4062
28 .3937 Y .4040 Z .4130
1/2 .5000 13 .4056 27/64 .4219 29/64 .4531 33/64 .5156 17/32 .5312
20 .4387 29/64 .4531 15/32 .4688
28 .4562 15/32 .4688 15/32 .4688
9/16 .5625 12 .4603 31/64 .4844 33/64 .5156 37/64 .5781 19/32 .5938
18 .4943 33/64 .5156 17/32 .5312
24 .5114 33/64 .5156 17/32 .5312
5/8 .6250 11 .5135 17/32 .5312 9/16 .5625 41/64 .6406 21/32 .6562
18 .5568 37/64 .5781 19/32 .5938
24 .5739 37/64 .5781 19/32 .5938
11/16 .6875 24 .6364 41/64 .6406 21/32 .6562 45/64 .7031 23/32 .6562
3/4 .7500 10 .6273 21/32 .6562 11/16 .6875 49/64 .7656 25/32 .7812
16 .6733 11/16 .6875 45/64 .7031
20 .6887 45/64 .7031 23/32 .7188
13/16 .8125 20 .7512 49/64 .7656 25/32 .7812 53/64 .8281 27/32 .8438
7/8 .8750 9 .7387 49/64 .7656 51/64 .7969 57/64 .8906 29/32 .9062
14 .7874 13/16 .8125 53/64 .8281
20 .8137 53/64 .8281 27/32 .8438
15/16 .9375 20 .8762 57/64 .8906 29/32 .9062 61/64 .9531 31/32 .9688
1 1.000 8 .8466 7/8 .8750 59/64 .9219 1-1/64 1.0156 1-1/32 1.0313
12 .8978 15/16 .9375 61/64 .9531
20 .9387 61/64 .9531 31/32 .9688

 

 

Tap Chart - Pipe Threads

Tap
size
Threads
per inch
Drill size w/ taper
pipe reamer
Drill size w/out
taper pipe reamer
Straight pipe
threads

1/16

27

15/64

D

1/4

1/8

27

21/64

Q

11/32

1/4

18

27/64

7/16

29/64

3/8

18

9/16

37/64

37/64

1/2

14

11/16

23/32

23/32

3/4

14

57/64

59/64

15/16

1

11.5

1 1/8

1 5/32

1 11/64

1 1/4

11.5

1 15/32

1 1/2

1 33/64

1 1/2

11.5

1 23/32

1 47/64

1 3/4

2

11.5

2 3/16

2 7/32

2 7/32

Note: All Sizes are Suggested only - We are not responsible for errors.