HEX KEYS

NOMINAL KEY
& SOCKET SIZE
W
Y
B
C
C
R
HEX WIDTH
ACROSS FLATS
HEX WIDTH
ACROSS CORNERS
LENGTH OF 
SHORT SIDE
BOTH STYLES
SHORT STYLE
LENGTH OF
LONG SIDE
LONG STYLE
LENGTH OF
LONG SIDE
RADIUS 
OF 
BEND
max
min
max
min
max
min
max
min
max
min
min
0.028
0.2800
0.0275
0.0314
0.0300
0.312
0.125
1.312
1.125
2.688
2.500
0.062
0.035
0.3500
0.0345
0.0393
0.3780
0.438
0.250
1.312
1.125
2.766
2.578
0.062
0.050
0.5000
0.0490
0.0560
0.0540
0.625
0.438
1.750
1.562
2.938
2.750
0.062
1/16
0.062
0.6250
0.0615
0.0701
0.0680
0.656
0.469
1.844
1.656
3.094
2.906
0.062
5/64
0.078
0.7810
0.0771
0.0880
0.0859
0.703
0.516
1.969
1.781
3.281
3.094
0.078
3/32
0.094
0.9370
0.0927
0.1058
0.1035
0.750
0.562
2.094
1.906
3.469
3.281
0.094
7/64
0.109
0.1094
0.1079
0.1238
0.1210
0.797
0.609
2.219
2.031
3.656
3.469
0.109
1/8
0.125
0.1250
0.1235
0.1418
0.1390
0.844
0.656
2.344
2.156
3.844
3.656
0.125
9/64
0.141
0.1406
0.1391
0.1593
0.1566
0.891
0.703
2.469
2.281
4.031
3.844
0.141
5/32
0.156
0.1562
0.1547
0.1774
0.1745
0.938
0.750
2.594
2.406
4.219
4.031
0.156
3/16
0.188
0.1875
0.1860
0.2135
0.2105
1.031
0.844
2.844
2.656
4.594
4.406
0.188
7/32
0.219
0.2187
0.2172
0.2490
0.2460
1.125
0.938
3.094
2.906
4.969
4.781
0.219
1/4
0.250
0.2500
0.2485
0.2845
0.2815
1.219
1.031
3.344
3.156
5.344
5.156
0.250
5/16
0.312
0.3125
0.3110
0.3570
0.3531
1.344
1.156
3.844
3.656
6.094
5.906
0.312
3/8
0.375
0.3750
0.3735
0.4285
0.4238
1.469
1.281
4.344
4.156
6.844
6.656
0.375
7/16
0.438
0.4375
0.4355
0.5005
0.4944
1.594
1.406
4.844
4.656
7.594
7.406
0.438
1/2
0.500
0.5000
0.4975
0.5715
0.5650
1.719
1.531
5.344
5.156
8.344
8.156
0.500

Hex keys can be manufactured to your specifications with short and long arm lengths that are not listed above. Six lobe also known as Torx® drive keys and Spline keys are also available. Hex keys are also available in all metric sizes. Ask your salesperson for more details.

Plated hex keys should be measured using the above dimensions before plating is applied. Long series and Short series refers to the length of long arm on the hex key. Hex keys can be manufactured to any length you require.

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