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Standard Plain and Gib Head Keys Specifications per. ANSI B17.1

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Standard Plain and Gib Head Keys Specifications per. ANSI B17.1

tandard Plain and Gib Head Keys

All dimensions are given in inches

Key Type
Nominal
Key Size
Tolerance
Width W
Over
To (Incl.)
Width, W
Height, H
Parallel
Square
Keystock
1-1⁄4
+0.001 −0.000
+0.001 −0.000
1-1⁄4
3
+0.002 −0.000
+0.002 −0.000
3
3-1⁄2
+0.003 −0.000
+0.003 −0.000
Bar Stock
3⁄4
+0.000 −0.002
+0.000 −0.002
3⁄4
1-1⁄2
+0.000 −0.003
+0.000 −0.003
1-1⁄2
2-1⁄2
+0.000 −0.004
+0.000 −0.004
2-1⁄2
3-1⁄2
+0.000 −0.006
+0.000 −0.006
Rectangular
Keystock
1-1⁄4
+0.001 −0.000
+0.005 −0.005
1-1⁄4
3
+0.002 −0.000
+0.005 −0.005
3
7
+0.003 −0.000
+0.005 −0.005
Bar Stock
3⁄4
+0.000 −0.003
+0.000 −0.003
3⁄4
1-1⁄2
+0.000 −0.004
+0.000 −0.004
1-1⁄2
3
+0.000 −0.005
+0.000 −0.005
3
4
+0.000 −0.006
+0.000 −0.006
4
6
+0.000 −0.008
+0.000 −0.008
6
7
+0.000 −0.013
+0.000 −0.013
Taper
Plain or Gib Head
Square or Rectangular
1-1/4
+0.001 −0.000
+0.005 −0.000
1-1⁄4
3
+0.002 −0.000
+0.005 −0.000
3
7
+0.003 −0.000
+0.005 −0.000
Gib Head Nominal Dimensions
Nominal Key
Size Width, W
Square
Rectangular
Nominal Key
Size Width, W
Square
Rectangular
H
A
B
H
A
B
H
A
B
H
A
B
1⁄8
1⁄8
1⁄4
1⁄4
3⁄32
3⁄16
1⁄8
1
1
1-5⁄8
1-1⁄8
3⁄4
1-1⁄4
7⁄8
3⁄16
3⁄16
5⁄16
5⁄16
1⁄8
1⁄4
1⁄4
1-1⁄4
1-1⁄4
2
1-7⁄16
7⁄8
1-3⁄8
1
1⁄4
1⁄4
7⁄16
3⁄8
3⁄16
5⁄16
5⁄16
1-1⁄2
1-1⁄2
2-3⁄8
1-3⁄4
1
1-5⁄8
1-1⁄8
5⁄16
5⁄16
1⁄2
7⁄16
1⁄4
7⁄16
3⁄8
1-3⁄4
1-3⁄4
2-3⁄4
2
1-1⁄2
2-3⁄8
1-3⁄4
3⁄8
3⁄8
5⁄8
1⁄2
1⁄4
7⁄16
3⁄8
2
2
3-1⁄2
2-1⁄4
1-1⁄2
2-3⁄8
1-3⁄4
1⁄2
1⁄2
7⁄8
5⁄8
3⁄8
5⁄8
1⁄2
2-1⁄2
2-1⁄2
4
3
1-3⁄4
2-3⁄4
2
5⁄8
5⁄8
1
3⁄4
7⁄16
3⁄4
9⁄16
3
3
5
3-1⁄2
2
3-1⁄2
2-1⁄4
3⁄4
3⁄4
1-1⁄4
7⁄8
1⁄2
7⁄8
5⁄8
3-1⁄2
3-1⁄2
6
4
2-1⁄2
4
3
7⁄8
7⁄8
1-3⁄8
1
5⁄8
1
3⁄4

*For locating position of dimension H. Tolerance does not apply.
For larger sizes the following relationships are suggested as guides for establishing A and B: A = 1.8H and B = 1.2H.

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