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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
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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