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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

ANSI Standard Keys and

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 stanbdards show 1-1/4 inches, preferred height is 1-1/2 inches.

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