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Hex Security Key

Nominal Size

Hexagon Width Across Flats

Length of Short Arm

Length of Long Arm

Hole Size

Max

Min

Max

Min

Max

Min

+ .005

1/16

.0625

.0615

.656

.469

1.844

1.656

.038

3/32

.0937

.0927

.750

.562

2.094

1.906

.050

1/8

.1250

.1235

.844

.656

2.344

2.156

.075

9/64

.1406

.1391

.891

.703

2.469

2.281

.084

5/32

.1562

.1547

.938

.750

2.594

2.406

.097

3/16

.1875

.1860

1.031

.844

2.844

2.656

.102

7/32

.2187

.2172

1.125

.938

3.094

2.906

.123

1/4

.2500

.2485

1.219

1.031

3.344

3.156

.123

5/16

.3125

.3110

1.344

1.156

3.844

3.656

.201