Machinery's Handbook, 31st Edition
Set Screws 1825 Table 15. ANSI Hexagon and Spline Socket Set Screws ANSI/ASME B18.3-2012 and ANSI/ASME B18.3-1998 (for Spline driven fasteners).
J
V
M M N
W
C
T
Flat Point
D
J
D J
L
D
R
Z
W
Q
C
X
Y
Oval Point For optional cup points and their dimensions see Table 10.
P
Cone Point
Half Dog
Cup Point
Socket Size
Half Dog Point
Oval Point Radius Basic
Min. Key Engagement Depth
Cup and Flat Point Diameters
Lgth. Limit for Angle
Nominal Size or Basic Screw Diameter
Hex. Nom.
Spl. Nom.
Dia. Max.
Lgth. Max.
Max.
Min.
Hex. T H a
Spl. T S a
Y b
J
M
C
P
Q
R
0 1 2 3 4 5 6 8
0.0600 0.028 0.033 0.033 0.027 0.040 0.017 0.045 0.050 0.026 0.0730 0.035 0.033 0.040 0.033 0.049 0.021 0.055 0.060 0.035 0.0860 0.035 0.048 0.047 0.039 0.057 0.024 0.064 0.060 0.040 0.0990 0.050 0.048 0.054 0.045 0.066 0.027 0.074 0.070 0.040 0.1120 0.050 0.060 0.061 0.051 0.075 0.030 0.084 0.070 0.045
0.09 0.09 0.13 0.13 0.19 0.19 0.19 0.25 0.25 0.31 0.38 0.44 0.50 0.57 0.75 0.88 1.00
0.1250 0.1380 0.1640 0.1900 0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000
0.072 0.067 0.057 0.083 0.033 0.094 0.080 0.055 0.072 0.074 0.064 0.092 0.038 0.104 0.080 0.055 0.096 0.087 0.076 0.109 0.043 0.123 0.090 0.080 0.111 0.102 0.088 0.127 0.049 0.142 0.100 0.080 0.145 0.132 0.118 0.156 0.067 0.188 0.125 0.125 0.183 0.172 0.156 0.203 0.082 0.234 0.156 0.156 0.216 0.212 0.194 0.250 0.099 0.281 0.188 0.188 0.251 0.252 0.232 0.297 0.114 0.328 0.219 0.219 0.291 0.291 0.270 0.344 0.130 0.375 0.250 0.250 0.372 0.371 0.347 0.469 0.164 0.469 0.312 0.312 0.454 0.450 0.425 0.562 0.196 0.562 0.375 0.375 0.595 0.530 0.502 0.656 0.227 0.656 0.500 0.500
1 ∕ 16 1 ∕ 16 5 ∕ 64 3 ∕ 32
10
1 ∕ 4
1 ∕ 8
5 ∕ 16
5 ∕ 32 3 ∕ 16 7 ∕ 32
3 ∕ 8
7 ∕ 16
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1 ∕ 4
5 ∕ 16
3 ∕ 8 1 ∕ 2
1
… 0.609 0.579 0.750 0.260 0.750 0.562 … 0.689 0.655 0.844 0.291 0.844 0.562 … 0.767 0.733 0.938 0.323 0.938 0.625 … 0.848 0.808 1.031 0.354 1.031 0.625 … 0.926 0.886 1.125 0.385 1.125 0.750 … 1.086 1.039 1.312 0.448 1.321 1.000 … 1.244 1.193 1.500 0.510 1.500 1.000
… 1.13 … 1.25 … 1.50 … 1.63 … 1.75 … 2.00
9 ∕ 16 9 ∕ 16
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2 1 3 ∕ 4
5 ∕ 8 5 ∕ 8 3 ∕ 4
1.7500 1 2.0000 1
2
… 2.25 a Reference should be made to the Standard for shortest optimum nominal lengths to which the minimum key engagement depths T H and T S apply. b Cone point angle Y is 90 degrees plus or minus 2 degrees for these nominal lengths or longer and 118 degrees plus or minus 2 degrees for shorter nominal lengths. All dimensions are in inches. The thread conforms to the Unified Standard, Class 3A, UNC and UNF series. The socket depth T is included in the Standard and some are shown here. The nominal length L of all socket type set screws is the total or overall length. For nominal screw lengths of 1 ∕ 16 through 3 ∕ 16 inch (0 through 3 sizes incl.) the standard length increment is 0.06 inch; for lengths 1 ∕ 8 through 1 inch the increment is 1 ∕ 8 inch; for lengths 1 through 2 inches the increment is 1 ∕ 4 inch; for lengths 2 through 6 inches the increment is 1 ∕ 2 inch; for lengths 6 inches and longer the increment is 1 inch. Socket dimensions are given in Table 11. Length Tolerance: The allowable tolerance on length L for all set screws of the socket type is ± 0.01 inch for set screws up to 5 ∕ 8 inch long; ± 0.02 inch for screws over 5 ∕ 8 to 2 inches long; ± 0.03 inch for screws over 2 to 6 inches long and ± 0.06 inch for screws over 6 inches long. Socket dimensions are given in Table 11. For manufacturing details, including materials, not shown, see American National Standard ANSI/ASME B18.3-2012 and ANSI/ASME B18.3-1998 (for Spline driven fasteners).
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