Machinery's Handbook, 31st Edition
Cap Screws
1817
Table 7. American National Standard Hexagon Socket and Spline Socket Button Head Cap Screws ANSI/ASME B18.3-2012 A L H S
A
D
M b
J
Slight Flat and/or Countersink Permissible
Hexagon Socket Size a
Head Side Height
Spline Socket Size a
Standard Length
Screw Diameter
Head Diameter
Head Height
Basic
Max.
Min.
Max.
Min.
Ref.
Nom.
Nom.
Max.
Nominal Size
D
A
H
S
M b
J
L
0 1 2 3 4 5 6 8
0.0600 0.114 0.104 0.032 0.026 0.010 0.048 0.0730 0.139 0.129 0.039 0.033 0.010 0.060 0.0860 0.164 0.154 0.046 0.038 0.010 0.060 0.0990 0.188 0.176 0.052 0.044 0.010 0.072 0.1120 0.213 0.201 0.059 0.051 0.015 0.072 0.1250 0.238 0.226 0.066 0.058 0.015 0.096 0.1380 0.262 0.250 0.073 0.063 0.015 0.096 0.1640 0.312 0.298 0.087 0.077 0.015 0.111 0.1900 0.361 0.347 0.101 0.091 0.020 0.145 0.2500 0.437 0.419 0.132 0.122 0.031 0.183 0.3125 0.547 0.527 0.166 0.152 0.031 0.216 0.3750 0.656 0.636 0.199 0.185 0.031 0.251 0.5000 0.875 0.851 0.265 0.245 0.046 0.372 0.6250 1.000 0.970 0.331 0.311 0.062 0.454
0.035 0.050 0.050
1 ∕ 2 1 ∕ 2 1 ∕ 2 1 ∕ 2 1 ∕ 2 1 ∕ 2 5 ∕ 8 3 ∕ 4
1 ∕ 16 1 ∕ 16 5 ∕ 64 5 ∕ 64 3 ∕ 32
10
1 1 1
1 ∕ 8
1 ∕ 4
5 ∕ 32 3 ∕ 16 7 ∕ 32 5 ∕ 16
5 ∕ 16
1 1 ∕ 4
3 ∕ 8 1 ∕ 2 5 ∕ 8
2 2
3 ∕ 8
a Socket dimensions are given in Table 11. b Spline driven fasteners are removed from the latest revision. For additional information on these fasteners, see ANSI/ASME B18.3-1998. All dimensions in inches. These cap screws have been designed and recommended for light fastening applications. They are not suggested for use in critical high-strength applications where socket head cap screws should normally be used. Standard length increments for socket button head cap screws are as follows: 1 ∕ 16 inch for nominal screw lengths of 1 ∕ 8 through 1 ∕ 4 inch, 1 ∕ 8 inch for nominal screw lengths of 1 ∕ 4 through 1 inch, and 1 ∕ 4 inch for nominal screw lengths of 1 inch through 2 inches. Tolerances on lengths are − 0.03 inch for lengths up to 1 inch inclusive. For lengths from 1 through 2 inches, inclusive, length tolerances are − 0.04 inch. The thread conforms to the Unified standard, Class 3A, with radius root, UNRC and UNRF. To prevent interference, American National Standard ANSI/ASME B18.3.4M-1986 gives metric dimensional and general requirements for a lower head profile hexagon socket button head cap screw. Because of its design, wrenchability and other design factors are reduced; therefore, B18.3.4M should be reviewed carefully. Available only in metric sizes and with metric threads. 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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