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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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