DIMENSION DIAGRAM (8)
Shaft, Key and Flange Dimensions (in.)
Shaft Tolerance
Depth Control Values S and T for Shaft and Hub
Nominal Shaft Dia.
Tolerance +0 ~ -.0005 ” +0 ~ -.001 ”
¹⁄₄ ~ 1¹⁄₂ + 1¹⁄₂ ~ 6¹⁄₂
Parallel Key and Keyseats (ANSI B 17.1-1967, R1973) Shaft diameter and accompanying key size
Parallel Square
Parallel Square
Nominal Shaft Diameter
Nominal Shaft Diameter
S
T
S
T
.430 .493 .517 .581 .644 .708 .771 .796 .859 .923 .986
.560 .623 .709 .773 .837 .900 .964
1.527 1.591 1.655 1.718 1.782 1.845 1.909 1.972 1.957 2.021 2.084 2.148 2.211 2.275 2.338 2.402 2.387 2.450 2.514 2.577
2.032 2.096 2.160 2.223 2.287 2.350 2.414 2.477 2.587 2.651 2.714 2.778 2.841 2.905 2.968 3.032 3.142 3.205 3.269 3.332
¹⁄₂ ⁹⁄₁₆ ⁵⁄₈ ¹¹⁄₁₆ ³⁄₄ ¹³⁄₁₆ ⁷⁄₈ ¹⁵⁄₁₆ 1 1¹⁄₁₆ 1¹⁄₈ 1³⁄₁₆ 1¹⁄₄ 1⁵⁄₁₆ 1³⁄₈ 1⁷⁄₁₆ 1¹⁄₂ 1⁹⁄₁₆ 1⁵⁄₈ 1¹¹⁄₁₆ 1³⁄₄
1¹³⁄₁₆ 1⁷⁄₈ 1¹⁵⁄₁₆ 2 2¹⁄₁₆ 2¹⁄₈ 2³⁄₁₆ 2¹⁄₄ 2⁵⁄₁₆ 2³⁄₈ 2⁷⁄₁₆ 2¹⁄₂ 2⁹⁄₁₆ 2⁵⁄₈ 2¹¹⁄₁₆ 2³⁄₄ 2¹³⁄₁₆ 2⁷⁄₈ 2¹⁵⁄₁₆ 3
Nominal Shaft Diameter
Nominal Key Size
Nominal Keyseat Depth
Width W
Height H
Over
To (incl.)
H/2
⁵⁄₁₆ ⁷⁄₁₆ ⁹⁄₁₆ ⁷⁄₈ 1¹⁄₄ 1³⁄₈ 1³⁄₄ 2¹⁄₄ 2³⁄₄
⁷⁄₁₆ ⁹⁄₁₆ ⁷⁄₈ 1¹⁄₄ 1³⁄₈ 1³⁄₄ 2¹⁄₄ 2³⁄₄ 3
³⁄₃₂ ¹⁄₈ ³⁄₁₆ ¹⁄₄ ⁵⁄₁₆
³⁄₃₂ ¹⁄₈ ³⁄₁₆ ¹⁄₄ ⁵⁄₁₆
³⁄₆₄ ¹⁄₁₆ ³⁄₃₂ ¹⁄₈ ⁵⁄₃₂ ³⁄₁₆ ¹⁄₄ ⁵⁄₁₆ ³⁄₈
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
³⁄₈ ¹⁄₂ ⁵⁄₈ ³⁄₄
³⁄₈ ¹⁄₂ ⁵⁄₈ ³⁄₄
1.049 1.112 1.137 1.201 1.255 1.289 1.352 1.416 1.479 1.542
ANSI Standard Fits for Parallel Keys
Key Width
Side Fit
Type of Key
Width Tolerance Key Keyseat
Fit Range
Over
To (incl.)
Parallel Square
+0.001 -0.000
+0.002 -0.000
0.002 CL 0.001 INT
— 3/4
CL = Clearance INT = Interference
Details of NEMA-C Flange Input Type
NEMA Frame No.
Hole dia.
B D J
K
T
U
V W Y
+.0014 -.0 +.0014 -.0 +.0018 -.0 +.0018 -.0
+.0015 -.0 +.0020 -.0 +.0020 -.0 +.0020 -.0
56C
.236
6.63
5.875
4.500
.55
.709
.1875
2.100
.433
⁵⁄₈
143/145 TC
.236
6.50
5.875
4.500
.55
.964
.1875
2.200
.433
⁷⁄₈
182/184 TC
.236
9.00
7.250
8.500
.944
1.241
.25
2.866
1.591
1¹⁄₈
213/215 TC
.236
9.00
7.250
8.500
.78
1.518
.3125
3.361
1.591
1³⁄₈
Dimension Y is for quill shaft depth of DISCO.
D-72
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