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Design Fits for Parallel and Taper Keys
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Standard Design Fits for Parallel and Taper Keys per. ANSI B17.1
|
Type
of Key |
Key
Width |
Side Fit
|
Top and
Bottom Fit |
||||||
|
Over
|
To
(Incl.) |
Width
Tolerance |
Fit Rangea
|
Depth
Tolerance |
Fit
Rangea |
||||
|
Key
|
Key-Seat
|
Key
|
Shaft
Key-Seat |
Hub
Key-Seat |
|||||
|
Class 1 Fit for Parallel Keys
|
|||||||||
|
Square
|
…
|
1⁄2
|
+0.000
−0.002 |
+0.002
−0.000 |
0.004 CL
0.000 |
+0.000
−0.002 |
+0.000
−0.015 |
+0.010
−0.000 |
0.032 CL
0.005 CL |
|
1⁄2
|
3⁄4
|
+0.000
−0.002 |
+0.003
−0.000 |
0.005 CL
0.000 |
+0.000
−0.002 |
+0.000
−0.015 |
+0.010
−0.000 |
0.032 CL
0.005 CL |
|
|
3⁄4
|
1
|
+0.000
−0.003 |
+0.003
−0.000 |
0.006 CL
0.000 |
+0.000
−0.003 |
+0.000
−0.015 |
+0.010
−0.000 |
0.033 CL
0.005 CL |
|
|
1
|
1-1⁄2
|
+0.000
−0.003 |
+0.004
−0.000 |
0.007 CL
0.000 |
+0.000
−0.003 |
+0.000
−0.015 |
+0.010
−0.000 |
0.033 CL
0.005 CL |
|
|
1-1⁄2
|
2-1⁄2
|
+0.000
−0.004 |
+0.004
−0.000 |
0.008 CL
0.000 |
+0.000
−0.004 |
+0.000
−0.015 |
+0.010
−0.000 |
0.034 CL
0.005 CL |
|
|
2-1⁄2
|
3-1⁄2
|
+0.000
−0.006 |
+0.004
−0.000 |
0.010 CL
0.000 |
+0.000
−0.006 |
+0.000
−0.015 |
+0.010
−0.000 |
0.036 CL
0.005 CL |
|
|
Rectangular
|
…
|
1⁄2
|
+0.000
−0.003 |
+0.002
−0.000 |
0.005 CL
0.000 |
+0.000
−0.003 |
+0.000
−0.015 |
+0.010
−0.000 |
0.033 CL
0.005 CL |
|
1⁄2
|
3⁄4
|
+0.000
−0.003 |
+0.003
−0.000 |
0.006 CL
0.000 |
+0.000
−0.003 |
+0.000
−0.015 |
+0.010
−0.000 |
0.033 CL
0.005 CL |
|
|
3⁄4
|
1
|
+0.000
−0.004 |
+0.003
−0.000 |
0.007 CL
0.000 |
+0.000
−0.004 |
+0.000
−0.015 |
+0.010
−0.000 |
0.034 CL
0.005 CL |
|
|
1
|
1-1⁄2
|
+0.000
−0.004 |
+0.004
−0.000 |
0.008 CL
0.000 |
+0.000
−0.004 |
+0.000
−0.015 |
+0.010
−0.000 |
0.034 CL
0.005 CL |
|
|
1-1⁄2
|
3
|
+0.000
−0.005 |
+0.004
−0.000 |
0.009 CL
0.000 |
+0.000
−0.005 |
+0.000
−0.015 |
+0.010
−0.000 |
0.035 CL
0.005 CL |
|
|
3
|
4
|
+0.000
−0.006 |
+0.004
−0.000 |
0.010 CL
0.000 |
+0.000
−0.006 |
+0.000
−0.015 |
+0.010
−0.000 |
0.036 CL
0.005 CL |
|
|
4
|
6
|
+0.000
−0.008 |
+0.004
−0.000 |
0.012 CL
0.000 |
+0.000
−0.008 |
+0.000
−0.015 |
+0.010
−0.000 |
0.038 CL
0.005 CL |
|
|
6
|
7
|
+0.000
−0.013 |
+0.004
−0.000 |
0.017 CL
0.000 |
+0.000
−0.013 |
+0.000
−0.015 |
+0.010
−0.000 |
0.043 CL
0.005 CL |
|
|
Class 2 Fit for Parallel and Taper Keys
|
|||||||||
|
Parallel
Square |
…
|
1-1⁄4
|
+0.001
−0.000 |
+0.002
−0.000 |
0.002 CL
0.001 INT |
+0.001
−0.000 |
+0.000
−0.015 |
+0.010
−0.000 |
0.030 CL
0.004 CL |
|
1-1⁄4
|
3
|
+0.002
−0.000 |
+0.002
−0.000 |
0.002 CL
0.002 INT |
+0.002
−0.000 |
+0.000
−0.015 |
+0.010
−0.000 |
0.030 CL
0.003 CL |
|
|
3
|
3-1⁄2
|
+0.003
−0.000 |
+0.002
−0.000 |
0.002 CL
0.003 INT |
+0.003
−0.000 |
+0.000
−0.015 |
+0.010
−0.000 |
0.030 CL
0.002 CL |
|
|
Parallel
Rectangular |
…
|
1-1⁄4
|
+0.001
−0.000 |
+0.002
−0.000 |
0.002 CL
0.001 INT |
+0.005
−0.005 |
+0.000
−0.015 |
+0.010
−0.000 |
0.035 CL
0.000 CL |
|
1-1⁄4
|
3
|
+0.002
−0.000 |
+0.002
−0.000 |
0.002 CL
0.002 INT |
+0.005
−0.005 |
+0.000
−0.015 |
+0.010
−0.000 |
0.035 CL
0.000 CL |
|
|
3
|
7
|
+0.003
−0.000 |
+0.002
−0.000 |
0.002 CL
0.003 INT |
+0.005
−0.005 |
+0.000
−0.015 |
+0.010
−0.000 |
0.035 CL
0.000 CL |
|
|
Taper
|
…
|
1-1⁄4
|
+0.001
−0.000 |
+0.002
−0.000 |
0.002 CL
0.001 INT |
+0.005
−0.000 |
+0.000
−0.015 |
+0.010
−0.000 |
0.005 CL
0.025 INT |
|
1-1⁄4
|
3
|
+0.002
−0.000 |
+0.002
−0.000 |
0.002 CL
0.002 INT |
+0.005
−0.000 |
+0.000
−0.015 |
+0.010
−0.000 |
0.005 CL
0.025 INT |
|
|
3
|
b
|
+0.003
−0.000 |
+0.002
−0.000 |
0.002 CL
0.003 INT |
+0.005
−0.000 |
+0.000
−0.015 |
+0.010
−0.000 |
0.005 CL
0.025 INT |
|
a Limits of variation.
CL = Clearance;
INT = Interference.
b To (Incl.) 31⁄2-inch Square and 7-inch Rectangular key widths.
All dimensions are given in inches.
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