INCH KEYS AND KEYSEATS Machinery's Handbook, 31st Edition
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Table 4. ASME Standard Fits for Parallel and Taper Keys ANSI/ASME B17.1-1967 (R2013)
Key Width
Side Fit
Top and Bottom Fit
Depth Tolerance
Width Tolerance
Type of Key
Shaft Key-Seat
Hub Key-Seat
Fit Range a
To (Incl.)
Fit Range a
Key Key-Seat
Key
Over
Class 1 Fit for Parallel Keys
+0.000 +0.002 0.004 CL +0.000 +0.000 +0.010 0.032 CL − 0.002 − 0.000 0.000 − 0.002 − 0.015 − 0.000 0.005 CL +0.000 +0.003 0.005 CL +0.000 +0.000 +0.010 0.032 CL − 0.002 − 0.000 0.000 − 0.002 − 0.015 − 0.000 0.005 CL +0.000 +0.003 0.006 CL +0.000 +0.000 +0.010 0.033 CL − 0.003 − 0.000 0.000 − 0.003 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.007 CL +0.000 +0.000 +0.010 0.033 CL − 0.003 − 0.000 0.000 − 0.003 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.008 CL +0.000 +0.000 +0.010 0.034 CL − 0.004 − 0.000 0.000 − 0.004 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.010 CL +0.000 +0.000 +0.010 0.036 CL − 0.006 − 0.000 0.000 − 0.006 − 0.015 − 0.000 0.005 CL +0.000 +0.002 0.005 CL +0.000 +0.000 +0.010 0.033 CL − 0.003 − 0.000 0.000 − 0.003 − 0.015 − 0.000 0.005 CL +0.000 +0.003 0.006 CL +0.000 +0.000 +0.010 0.033 CL − 0.003 − 0.000 0.000 − 0.003 − 0.015 − 0.000 0.005 CL +0.000 +0.003 0.007 CL +0.000 +0.000 +0.010 0.034 CL − 0.004 − 0.000 0.000 − 0.004 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.008 CL +0.000 +0.000 +0.010 0.034 CL − 0.004 − 0.000 0.000 − 0.004 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.009 CL +0.000 +0.000 +0.010 0.035 CL − 0.005 − 0.000 0.000 − 0.005 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.010 CL +0.000 +0.000 +0.010 0.036 CL − 0.006 − 0.000 0.000 − 0.006 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.012 CL +0.000 +0.000 +0.010 0.038 CL − 0.008 − 0.000 0.000 − 0.008 − 0.015 − 0.000 0.005 CL +0.000 +0.004 0.017 CL +0.000 +0.000 +0.010 0.043 CL − 0.013 − 0.000 0.000 − 0.013 − 0.015 − 0.000 0.005 CL Class 2 Fit for Parallel and Taper Keys +0.001 +0.002 0.002 CL +0.001 +0.000 +0.010 0.030 CL − 0.000 − 0.000 0.001 INT − 0.000 − 0.015 − 0.000 0.004 CL +0.002 +0.002 0.002 CL +0.002 +0.000 +0.010 0.030 CL − 0.000 − 0.000 0.002 INT − 0.000 − 0.015 − 0.000 0.003 CL +0.003 +0.002 0.002 CL +0.003 +0.000 +0.010 0.030 CL − 0.000 − 0.000 0.003 INT − 0.000 − 0.015 − 0.000 0.002 CL +0.001 +0.002 0.002 CL +0.005 +0.000 +0.010 0.035 CL − 0.000 − 0.000 0.001 INT − 0.005 − 0.015 − 0.000 0.000 CL +0.002 +0.002 0.002 CL +0.005 +0.000 +0.010 0.035 CL − 0.000 − 0.000 0.002 INT − 0.005 − 0.015 − 0.000 0.000 CL +0.003 +0.002 0.002 CL +0.005 +0.000 +0.010 0.035 CL − 0.000 − 0.000 0.003 INT − 0.005 − 0.015 − 0.000 0.000 CL +0.001 +0.002 0.002 CL +0.005 +0.000 +0.010 0.005 CL − 0.000 − 0.000 0.001 INT − 0.000 − 0.015 − 0.000 0.025 INT +0.002 +0.002 0.002 CL +0.005 +0.000 +0.010 0.005 CL − 0.000 − 0.000 0.002 INT − 0.000 − 0.015 − 0.000 0.025 INT +0.003 +0.002 0.002 CL +0.005 +0.000 +0.010 0.005 CL − 0.000 − 0.000 0.003 INT − 0.000 − 0.015 − 0.000 0.025 INT
…
1 ∕ 2
3 ∕ 4
1 ∕ 2
1
3 ∕ 4
Square
1
1 1 ∕ 2
2 1 ∕ 2
1 1 ∕ 2
3 1 ∕ 2
2 1 ∕ 2
…
1 ∕ 2
3 ∕ 4
1 ∕ 2
1
3 ∕ 4
1
1 1 ∕ 2
Rectan gular
3
1 1 ∕ 2
3
4
4
6
6
7
… 1 1 ∕ 4
Parallel Square
3
1 1 ∕ 4
3
3 1 ∕ 2
… 1 1 ∕ 4
Parallel Rectan gular
3
1 1 ∕ 4
3
7
… 1 1 ∕ 4
Taper
3
1 1 ∕ 4
b
3
a Limits of variation. CL = Clearance; INT = Interference. b To (Incl.) 3½-inch Square and 7-inch Rectangular key widths. All dimensions are given in inches. See also text on page 2539.
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