Machinery's Handbook, 31st Edition
2552 INCH KEYS AND KEYSEATS If special considerations dictate the use of a keyseat in the hub shallower than the pre ferred nominal depth shown, it is recommended that the tabulated preferred nominal standard keyseat always be used in the shaft. Keyseat Alignment Tolerances: A tolerance of 0.010 inch (0.254 mm), max is provided for offset (due to parallel displacement of keyseat centerline from centerline of shaft or bore) of keyseats in shaft and bore. The following tolerances for maximum lead (due to angular displacement of keyseat centerline from centerline of shaft or bore and measured at right angles to the shaft or bore centerline) of keyseats in shaft and bore are speci- fied: 0.002 inch (0.0508 mm) for keyseat length up to and including 4 inches (101.6 mm); 0.0005 inch per inch of length (0.0127 mm per mm) for keyseat lengths above 4 inches to and including 10 inches (254 mm); and 0.005 inch (0.127 mm) for keyseat lengths above 10 inches. For the effect of keyways on shaft strength, see Effect of Keyways on Shaft Strength on page 301.
T
S
Table 2. Depth Control Values S and T for Shaft and Hub ANSI/ASME B17.1-1967 (R2013)
Shafts, Parallel and Taper
Hubs, Parallel
Hubs, Taper
Nominal Shaft Diameter
Square
Rectangular
Square
Rectangular
Square
Rectangular
S
S
T
T
T
T
0.430 0.493 0.517 0.581 0.644 0.708 0.771 0.796 0.859 0.923 0.986 1.049 1.112 1.137 1.201 1.225 1.289 1.352 1.416 1.479 1.542 1.527 1.591 1.655 1.718 1.782 1.845 1.909 1.972 1.957 2.021 2.084 2.148
0.445 0.509 0.548 0.612 0.676 0.739 0.802 0.827 0.890 0.954 1.017 1.080 1.144 1.169 1.232 1.288 1.351 1.415 1.478 1.541 1.605 1.590 1.654 1.717 1.781 1.844 1.908 1.971 2.034 2.051 2.114 2.178 2.242
0.560 0.623 0.709 0.773 0.837 0.900 0.964 1.051 1.114 1.178 1.241 1.304 1.367 1.455 1.518 1.605 1.669 1.732 1.796 1.859 1.922 2.032 2.096 2.160 2.223 2.287 2.350 2.414 2.477 2.587 2.651 2.714 2.778
0.544 0.607 0.678 0.742 0.806 0.869 0.932 1.019 1.083 1.146 1.210 1.273 1.336 1.424 1.487 1.543 1.606 1.670 1.733 1.796 1.860 1.970 2.034 2.097 2.161 2.224 2.288 2.351 2.414 2.493 2.557 2.621 2.684
0.535 0.598 0.684 0.748 0.812 0.875 0.939 1.026 1.089 1.153 1.216 1.279 1.342 1.430 1.493 1.580 1.644 1.707 1.771 1.834 1.897 2.007 2.071 2.135 2.198 2.262 2.325 2.389 2.452 2.562 2.626 2.689 2.753
0.519 0.582 0.653 0.717 0.781 0.844 0.907 0.994 1.058 1.121 1.185 1.248 1.311 1.399 1.462 1.518 1.581 1.645 1.708 1.771 1.835 1.945 2.009 2.072 2.136 2.199 2.263 2.326 2.389 2.468 2.532 2.596 2.659
1 ∕ 2
9 ∕ 16
5 ∕ 8
11 ∕ 16
3 ∕ 4
13 ∕ 16
7 ∕ 8
15 ∕ 16
1
1 1 ∕ 16 1 1 ∕ 8 1 3 ∕ 16 1 1 ∕ 4 1 5 ∕ 16 1 3 ∕ 8 1 7 ∕ 16 1 1 ∕ 2 1 9 ∕ 16 1 5 ∕ 8 1 11 ∕ 16
1 3 ∕ 4
1 13 ∕ 16
1 7 ∕ 8
1 15 ∕ 16 2 1 ∕ 16 2 1 ∕ 8 2 3 ∕ 16 2 1 ∕ 4 2 2 5 ∕ 16 2 3 ∕ 8 2 7 ∕ 16 2 1 ∕ 2
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