Machinery's Handbook, 31st Edition
2554 INCH KEYS AND KEYSEATS Table 3. ANSI Standard Plain and Gib Head Keys ANSI/ASME B17.1-1967 (R2013)
B/2 Approx
Hub length
H
45°
A
Parallel
H
W*
W
B
W
Plain and gib head taper keys have a 1/8 ” taper in 12 ”
Gib Head Taper
W*
Hub length
Hub length H
W*
H
W
W
Plain Taper
Alternate Plain Taper
Nominal Key Size Width W Over To (Incl.)
Tolerance
Width, W
Height, H
Key
… 1 1 ∕ 4
+0.001 +0.002 +0.003 +0.000 +0.000 +0.000 +0.000 +0.001 +0.002 +0.003 +0.000 +0.000 +0.000 +0.000 +0.000 +0.000 +0.001 +0.002 +0.003
− 0.000 +0.001 − 0.000 +0.002 − 0.000 +0.003 − 0.002 +0.000 − 0.003 +0.000 − 0.004 +0.000 − 0.006 +0.000 − 0.000 +0.005 − 0.000 +0.005 − 0.000 +0.005 − 0.003 +0.000 − 0.004 +0.000 − 0.005 +0.000 − 0.006 +0.000 − 0.008 +0.000 − 0.013 +0.000 − 0.000 +0.005 − 0.000 +0.005 − 0.000 +0.005
− 0.000 − 0.000 − 0.000 − 0.002 − 0.003 − 0.004 − 0.006 − 0.005 − 0.005 − 0.005 − 0.003 − 0.004 − 0.005 − 0.006 − 0.008 − 0.013 − 0.000 − 0.000 − 0.000
Keystock
3
1 1 ∕ 4
3
3 1 ∕ 2
Square
…
3 ∕ 4
1 1 ∕ 2 2 1 ∕ 2 3 1 ∕ 2
3 ∕ 4
Bar Stock
1 1 ∕ 2 2 1 ∕ 2
… 1 1 ∕ 4
Parallel
Keystock
3 7
1 1 ∕ 4
3
…
3 ∕ 4
Rectangular
1 1 ∕ 2
3 ∕ 4
3 4 6 7 3 7
1 1 ∕ 2
Bar Stock
3 4 6
… 1 1 ∕ 4
Plain or Gib Head Square or Rectangular
Taper
1 1 ∕ 4
3
Gib Head Nominal Dimensions
Square
Rectangular
Square
Rectangular
Nominal Key Size Width, W
Nominal Key Size Width, W
H A B H A B
H A B H A B
1
1
1 1 ∕ 8 1 7 ∕ 16 1 3 ∕ 4
1 1 ∕ 4 1 3 ∕ 8 1 5 ∕ 8 2 3 ∕ 8 2 3 ∕ 8 2 3 ∕ 4 3 1 ∕ 2
1 5 ∕ 8
1 ∕ 8
1 ∕ 4
1 ∕ 4
3 ∕ 32
3 ∕ 16 1 ∕ 8
3 ∕ 4 7 ∕ 8
7 ∕ 8
1 ∕ 8
2
1
1 1 ∕ 4 1 1 ∕ 2 1 3 ∕ 4
1 1 ∕ 4 1 1 ∕ 2 1 3 ∕ 4
3 ∕ 16
5 ∕ 16 7 ∕ 16
5 ∕ 16 1 ∕ 8
1 ∕ 4
1 ∕ 4
3 ∕ 16
1
2 3 ∕ 8 2 3 ∕ 4 3 1 ∕ 2
1 1 ∕ 8 1 3 ∕ 4 1 3 ∕ 4
1 ∕ 4
3 ∕ 8
3 ∕ 16
5 ∕ 16 5 ∕ 16 7 ∕ 16 3 ∕ 8 7 ∕ 16 3 ∕ 8
1 ∕ 4
2
1 1 ∕ 2 1 1 ∕ 2 1 3 ∕ 4
5 ∕ 16
1 ∕ 2 5 ∕ 8 7 ∕ 8
7 ∕ 16 1 ∕ 4
5 ∕ 16
2
2
2 1 ∕ 4
3 ∕ 8 1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1 ∕ 4 3 ∕ 8
3 ∕ 8 1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
4 5 6
3
2
2 1 ∕ 2
2 1 ∕ 2
5 ∕ 8 3 ∕ 4 7 ∕ 8
1 ∕ 2
1
3
3
2
2 1 ∕ 4
3 1 ∕ 2
7 ∕ 16
9 ∕ 16
4
4
3
1 1 ∕ 4 1 3 ∕ 8
3 1 ∕ 2
3 1 ∕ 2
2 1 ∕ 2
1 ∕ 2 5 ∕ 8
5 ∕ 8 3 ∕ 4
1
1
… … … … … … …
All dimensions are given in inches. *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 = 1.8 H and B = 1.2 H .
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online