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Shaft Diameter vs Key Sizes Design Recommendations
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Recommended ANSI Standard Keys and Keyseats Design per. ANSI B17.1
Recommended uniform relationship between shaft diameter and key sizes for parallel and taper keys. All sizes are in inch units.
|
Nominal
Shaft Diameter |
Nominal
Key Size |
Normal
Keyseat Depth |
||||
|---|---|---|---|---|---|---|
|
Over
|
To (Incl.)
|
Width, W
|
Height, H
|
H/2
|
||
|
Square
|
Rectangular
|
Square
|
Rectangular
|
|||
|
5/16
|
7/16
|
3/32
|
3/32
|
…
|
3/64
|
…
|
|
7/16
|
9/16
|
1/8
|
1/8
|
3/32
|
1/16
|
3/64
|
|
9/16
|
7/8
|
3/16
|
3/16
|
1/8
|
3/32
|
1/16
|
|
7/8
|
1-1/4
|
1/4
|
1/4
|
3/16
|
1/8
|
3/32
|
|
1-1/4
|
1-3/8
|
5/16
|
5/16
|
1/4
|
5/32
|
1/8
|
|
1-3/8
|
1-3/4
|
3/8
|
3/8
|
1/4
|
3/16
|
1/8
|
|
1-3/4
|
2-1/4
|
1/2
|
1/2
|
3/8
|
1/4
|
3/16
|
|
2-1/4
|
2-3/4
|
5/8
|
5/8
|
7/16
|
5/16
|
7/32
|
|
2-3/4
|
3-1/4
|
3/4
|
3/4
|
1/2
|
3/8
|
1/4
|
|
3-1/4
|
3-3/4
|
7/8
|
7/8
|
5/8
|
7/16
|
5/16
|
|
3-3/4
|
4-1/2
|
1
|
1
|
3/4
|
1/2
|
3/8
|
|
4-1/2
|
5-1/2
|
1-1/4
|
1-1/4
|
7/8
|
5/8
|
7/16
|
|
5-1/2
|
6-1/2
|
1-1/2
|
1-1/2
|
1
|
3/4
|
1/2
|
|
Square Keys preferred for shaft diameters
above this line; rectangular keys, below |
||||||
|
6-1/2
|
7-1/2
|
1-3/4
|
1-3/4
|
1-1/2 a
|
7/8
|
3/4
|
|
7-1/2
|
9
|
2
|
2
|
1-1/2
|
1
|
3/4
|
|
9
|
11
|
2-1/2
|
2-1/2
|
1-3/4
|
1-1/4
|
7/8
|
a Some key standards show 1-1/4 inches, preferred height is 1-1/2 inches.
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