Standard Keyways
Keyway and Key Size Dimensions
Shaft Diameter
Cutter Width
Key Depth
3/8" = 0.375
3/32" = .093-3/4
3/64" = .046-7/8
1/2" = 0.5
1/8" = 0.125
1/16" = .062-1/2
5/8" = 0.625
3/16" = .187-1/2
3/32" = .093-3/4
11/16" = .687-1/2"
3/16" = .187-1/2
3/32" = .093-3/4
3/4" = 0.75
3/16" = .187-1/2
3/32" = .093-3/4
7/8" = 0.875
3/16" = .187-1/2
3/32" = .093-3/4
15/16" = .937-1/2"
1/4" = 0.25
1/8" = 0.125
1" = 1
1/4" = 0.25
1/8" = 0.125
1-1/8" = 1.125
1/4" = 0.25
1/8" = 0.125
1-3/16" = 1.187-1/2"
1/4" = 0.25
1/8" = 0.125
1-1/4" = 1.25
1/4" = 0.25
1/8" = 0.125
1-5/16" = 1.312-1/2
5/16" = .312-1/2
5/32" = .156-1/4
1-3/8" = 1.375
5/16" = .312-1/2
5/32" = .156-1/4
1-7/16" = 1.437-1/2
3/8" = 0.375
3/16" = .187-1/2
1-1/2" = 1.5
3/8" = 0.375
3/16" = .187-1/2
1-5/8" = 1.625
3/8" = 0.375
3/16" = .187-1/2
1-11/16" = 1.687-1/2
3/8" = 0.375
3/16" = .187-1/2
1-3/4" = 1.75
3/8" = 0.375
3/16" = .187-1/2
1-7/8" = 1.875
1/2" = 0.5
1/4" = 0.25
1-15/16" = 1.937-1/2
1/2" = 0.5
1/4" = 0.25
2" = 2
1/2" = 0.5
1/4" = 0.25
2-1/8" = 2.125
1/2" = 0.5
1/4" = 0.25
2-3/16" = 2.187-1/2
1/2" = 0.5
1/4" = 0.25
2-1/4" = 2.25
1/2" = 0.5
1/4" = 0.25
2-3/8" = 2.375
5/8" = 0.625
5/16" = .312-1/2
2-7/16" = 2.437-1/2
5/8" = 0.625
5/16" = .312-1/2
2-1/2" = 2.5
5/8" = 0.625
5/16" = .312-1/2
2-5/8" = 2.625
5/8" = 0.625
5/16" = .312-1/2
2-11/16" = 2.687-1/2
5/8" = 0.625
5/16" = .312-1/2
2-15/16" = 2.937-1/2
3/4" = 0.75
3/8" = 0.375
3" = 3
3/4" = 0.75
3/8" = 0.375
3-7/16" = 3.437-1/2
7/8" = 0.875
7/16" = .437-1/2
3-1/2" = 3.5
7/8" = 0.875
7/16" = .437-1/2
3-15/16" = 3.937-1/2
1" = 1
1/2" = 0.5
4" = 4
1" = 1
1/2" = 0.5
4-7/16" = 4.437-1/2
1" = 1
1/2" = 0.5
4-15/16" = 4.937-1/2
1-1/4" = 1.25
5/8" = 0.625
5-7/16" = 5.437
1-1/4" = 1.25
5/8" = 0.625
10" = 10
2-1/2" = 2.5
1-1/4" = 1.25