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Hex Keys

Looped T-Handle Hex Key & Sets

These keys are precision heat treated, hardened, and tempered to ensure maximum toughness at the wrench core. The continuous "loop" handle is correctly proportioned and contoured for balanced two-fisted grip and extra leverage. Available individually or in sets.

Group codes Represented: THW
Part# Examples: 31916THW

Hex Keys Hex key kit photo

Hex keys provide a precision fit for maximum engagement, and prevent rounding of hex sockets. They are made of a heat treated alloy steel that meets ANSI specifications B18.3 and GGG-K-275. Stocked in short and long arm sizes in diameters from 0.028" to 1 3/4" and lengths from 15/16" to 23 1/2". Available with extra long arm sizes. and in sets

Group codes Represented: LAHK, SAHK, MHK
Part# Example: 14LAHK, 62SAHK

Hex keys diagram

 

 

 

Hex Keys & Bits, Long & Short Arm
Nominal Key or Bit and Socket Size
W
Y
B
C
R
K
Hex Width Across the Flats
Hex Width Across the Corners
Length of Short Arm
Length of Long Arm
Radius of Bend
Chamfer
Short Series
Long Series
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Min
Max
....
.028
.0280
.0275
.0314
.0300
.312
.125
1.312
1.125
2.688
2.500
.062
.003
.035
.0350
.0345
.0393
.0378
.438
.250
2.766
2.578
.004
.050
.0500
.0490
.0560
.0540
.625
.438
1.750
1.562
2.938
2.750
.006
1/16
.062
.0625
.0615
.0701
.0680
.656
.469
1.844
1.656
3.094
2.906
.008
5/64
.078
.0781
.0771
.0880
.0859
.703
.516
1.969
1.781
3.281
3.094
.078
3/32
.094
.0937
.0927
.1058
.1035
.750
.562
2.094
1.906
3.469
3.281
.094
.009
7/64
.109
.1094
.1079
.1238
.1210
.797
.609
2.219
2.031
3.656
3.469
.109
.014
1/8
.125
.1250
.1235
.1418
.1390
.844
.656
2.344
2.156
3.844
3.656
.125
.015
9/64
.141
.1406
.1391
.1593
.1566
.891
.703
2.469
2.281
4.031
3.844
.141
.016
5/32
.156
.1562
.1547
.1774
.1745
.938
.750
2.594
2.406
4.219
4.031
.156
3/16
.188
.1875
.1860
.2135
.2105
1.031
.844
2.844
2.656
4.594
4.406
.188
.022
7/32
.219
.2187
.2172
.2490
.2460
1.125
.938
3.094
2.906
4.969
4.781
.219
.024
1/4
.250
.2500
.2485
.2845
.2815
1.219
1.031
3.344
3.156
5.344
5.156
.250
.030
5/16
.312
.3125
.3110
.3570
.3531
1.344
1.156
3.844
3.656
6.094
5.906
.312
.032
3/8
.375
.3750
.3735
.4285
.4238
1.469
1.281
4.344
4.156
6.844
6.656
.375
.044
7/16
.438
.4375
.4355
.5005
.4944
1.594
1.406
4.844
4.656
7.594
7.406
.438
.047
1/2
.500
.5000
.4975
.5715
.5650
1.719
1.531
5.344
5.156
8.344
8.156
.500
.050
9/16
.562
.5625
.5600
.6420
.6356
1.844
1.656
5.844
5.656
9.094
8.906
.562
.053
5/8
.625
.6250
.6225
.7146
.7080
1.969
1.781
6.344
6.156
9.844
9.656
.625
.055
3/4
.750
.7500
.7470
.8580
.8512
2.219
2.031
7.344
7.156
11.344
11.156
.750
.070
7/8
.875
.8750
.8720
1.0020
.9931
2.469
2.281
8.344
8.156
12.844
12.656
.875
.076
1
1.000
1.0000
.9970
1.1470
1.1350
2.719
2.531
9.344
9.156
14.344
14.156
1.000
.081
Tolerance on Length of Key Bits
±0.062
Hex Keys & Bits
Nominal Size
Torsion Shear Average (Inch-Pounds)
Torque Rating (Inch-Pounds)
.028
1.1
.86
.035
2.3
1.80
.050
6.5
5.00
1/16
11.9
9.50
5/64
25.0
19.40
3/32
43.0
33.50
7/64
68.0
52.90
1/8
98.0
77.90
9/64
146.0
117.00
5/32
195.0
156.00
3/16
342.0
273.00
7/32
535.0
428.00
1/4
770.0
615.00
5/16
1600.0
1315.00
3/8
2500.0
2150.00
7/16
4500.0
3665.00
1/2
6300.0
5130.00
9/16
8750.0
7010.00
5/8
12000.0
9810.00
3/4
19500.0
15570.00
7/8
29000.0
23400.00
1
43500.0
35100.00

 

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