CONVERSION CHARTS

Bolt size to standard and metric wrench sizes

Bolt Standard Metric Bolt Standard Metric
1/8″ 5/16″ 8mm 1″ 25mm
3/16″ 3/8″ 10mm 3/4″ 1-1/8″ 29mm
1/4″ 7/16″ 11mm 1-1/4″ 32mm
5/16″ 1/2″ 13mm 7/8″ 1-5/16″ 34mm
3/8″ 9/16″ 14mm 1-3/8″ 35mm
7/16″ 5/8″ 16mm 1″ 1-1/2″ 38mm
1/2″ 3/4″ 19mm 1-5/8″ 41mm
9/16″ 13/16″ 21mm 1-1/8″ 1-11/16″ 43mm
7/8″ 22mm 1-3/4″ 45mm
5/8″ 15/16″ 24mm 1-1/4″ 1-7/8″ 48mm
1-3/8″ 2″ 51mm

Drill bit to tap conversion chart

Tap Fractional
Drill
Bit
Number
Drill
Bit
Letter
Drill
Bit
0-80 3/64
1-64 53
2-56 50
3-48 47
4-40 3/32 43
5-40 38
6-32 7/64 35
8-32 29
10-24 5/32 25
10-32 5/32 21
12-24 11/64 16
1/4-20 13/64 7
1/4-28 7/32 3
5/16-18 17/64 F
5/16-24 I
3/8-16 5/16
3/8-24 21/64 Q
7/16-14 23/64 U
7/16-20 25/64
1/2-13 27/64
1/2-20 29/64
9/16-12 31/64
9/16-18 33/64
5/8-11 17/32
5/8-18 37/64
3/4-10 21/32
3/4-16 11/16

Fraction-decimal-millimeter conversion

Fraction Decimal MM Fraction Decimal MM
1/64 0.0156 0.3969 1-1/64 1.0156 25.7969
1/32 0.0313 0.7938 1-1/32 1.0313 26.1938
3/64 0.0469 1.1906 1-3/64 1.0469 26.5906
1/16 0.0625 1.5875 1-1/16 1.0625 26.9875
5/64 0.0781 1.9844 1-5/64 1.0781 27.3844
3/32 0.0938 2.3813 1-3/32 1.0938 27.7813
7/64 0.1094 2.7781 1-7/64 1.1094 28.1781
1/8 0.1250 3.175 1-1/8 1.125 28.575
9/64 0.1406 3.5719 1-9/64 1.1406 28.9719
5/32 0.1563 3.9688 1-5/32 1.1563 29.3688
11/64 0.1719 4.3656 1-11/64 1.1719 29.7656
3/16 0.1875 4.7625 1-3/16 1.1875 30.1625
13/64 0.2031 5.1594 1-13/64 1.2031 30.5594
7/32 0.2188 5.5563 1-7/32 1.2188 30.9563
15/64 0.2344 5.9531 1-15/64 1.2344 31.3531
1/4 .2500 6.3500 1-1/4 1.25 31.75
17/64 0.2656 6.7469 1-17/64 1.2656 32.1469
9/32 0.2813 7.1438 1-9/32 1.2813 32.5438
19/64 0.2969 7.5406 1-19/64 1.2969 32.9406
5/16 0.3125 7.9375 1-5/16 1.3125 33.3375
21/64 0.3281 8.3344 1-21/64 1.3281 33.7344
11/32 0.3438 8.7313 1-11/32 1.3438 34.1313
23/64 0.3594 9.1281 1-23/64 1.3594 34.5281
3/8 0.3750 9.5250 1-3/8 1.375 34.925
25/64 0.3906 9.9219 1-25/64 1.3906 35.3219
13/32 0.4063 10.3188 1-13/32 1.4063 35.7188
27/64 0.4219 10.7156 1-27/64 1.4219 36.1156
7/16 0.4375 11.1125 1-7/16 1.4375 36.5125
29/64 0.4531 11.5094 1-29/64 1.4531 36.9094
15/32 0.4688 11.9063 1-15/32 1.4688 37.3063
31/64 0.4844 12.3031 1-31/64 1.4844 37.7031
1/2 0.5000 12.7000 1-1/2 1.5 38.1
33/64 0.5156 13.0969 1-33/64 1.5156 38.4969
17/32 0.5313 13.4938 1-17/32 1.5313 38.8938
35/64 0.5469 13.8906 1-35/64 1.5469 39.2906
9/16 0.5625 14.2875 1-9/16 1.5625 39.6875
37/64 0.5781 14.6844 1-37/64 1.5781 40.0844
19/32 0.5938 15.0813 1-19/32 1.5938 40.4813
39/64 0.6094 15.4781 1-39/64 1.6094 40.8781
5/8 0.625 15.875 1-5/8 1.625 41.275
41/64 0.6406 16.2719 1-41/64 1.6406 41.6719
21/32 0.6563 16.6688 1-21/32 1.6563 42.0688
43/64 0.6719 17.0656 1-43/64 1.6719 42.4656
11/16 0.6875 17.4625 1-11/16 1.6875 42.8625
45/64 0.7031 17.8594 1-45/64 1.7031 43.2594
23/32 0.7188 18.2563 1-23/32 1.7188 43.6563
47/64 0.7344 18.6531 1-47/64 1.7344 44.0531
3/4 0.75 19.05 1-3/4 1.75 44.45
49/64 0.7656 19.4469 1-49/64 1.7656 44.8469
25/32 0.7813 19.8438 1-25/32 1.7813 45.2438
51/64 0.7969 20.2406 1-51/64 1.7969 45.6406
13/16 0.8125 20.6375 1-13/16 1.8125 46.0375
53/64 0.8281 21.0344 1-53/64 1.8281 46.4344
27/32 0.8438 21.4313 1-27/32 1.8438 46.8313
55/64 0.8594 21.8281 1-55/64 1.8594 47.2281
7/8 0.875 22.225 1-7/8 1.875 47.625
57/64 0.8906 22.6219 1-57/64 1.8906 48.0219
29/32 0.9063 23.0188 1-29/32 1.9063 48.4188
59/64 0.9219 23.4156 1-59/64 1.9219 48.8156
15/16 0.9375 23.8125 1-15/16 1.9375 49.2125
61/64 0.9531 24.2094 1-61/64 1.9531 49.6094
31/32 0.9688 24.6063 1-31/32 1.9688 50.0063
63/64 0.9844 25.0031 1-63-64 1.9844 50.4031
1 1 25.4 2 2 50.8
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