Machinery's Handbook, 31st Edition
1816 Cap Screws Table 6. American National Standard Hexagon and Spline Socket Flat Countersunk Head Cap Screws ANSI/ASME B18.3-2012
Theoretical Sharp Absolute Minimum
A A
Round or Flat
L
H
Enlarged View of Head
L T
80° ±2°
D
M a
J
T
Head Diameter
Head Height
Hexagon Socket Size
Key Engage ment
Body Diameter
Theoretical Sharp
Spline Socket Size
Abs. Min.
Max.
Min.
Max.
Reference
Nom.
Min.
Nominal Size
D
A
H
M a
J
T
0 1 2 3 4 5 6 8
0.0600 0.0730 0.0860 0.0990 0.1120 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
0.0568 0.0695 0.0822 0.0949 0.1075 0.1202 0.1329 0.1585 0.1840 0.2435 0.3053 0.3678 0.4294 0.4919 0.6163 0.7406 0.8647 0.9886 1.1086 1.2336 1.3568 1.4818
0.138 0.168 0.197 0.226 0.255 0.281 0.307 0.359 0.411 0.531 0.656 0.781 0.844 0.938 1.188 1.438 1.688 1.938 2.188 2.438 2.688 2.938
0.117 0.143 0.168 0.193 0.218 0.240 0.263 0.311 0.359 0.480 0.600 0.720 0.781 0.872 1.112 1.355 1.604 1.841 2.079 2.316 2.553 2.791
0.044 0.054 0.064 0.073 0.083 0.090 0.097 0.112 0.127 0.161 0.198 0.234 0.234 0.251 0.324 0.396 0.468 0.540 0.611 0.683 0.755 0.827
0.048 0.060 0.060 0.072 0.072 0.096 0.096 0.111 0.145 0.183 0.216 0.251 0.291 0.372 0.454 0.454
0.035 0.050 0.050
0.025 0.031 0.038 0.044 0.055 0.061 0.066 0.076 0.087 0.111 0.135 0.159 0.159 0.172 0.220 0.220 0.248 0.297 0.325 0.358 0.402
1 ∕ 16 1 ∕ 16 5 ∕ 64 5 ∕ 64 3 ∕ 32
10
1 ∕ 8
1 ∕ 4
5 ∕ 32 3 ∕ 16 7 ∕ 32
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 4
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
5 ∕ 16
3 ∕ 8 1 ∕ 2
… … … … …
9 ∕ 16
1
5 ∕ 8 3 ∕ 4 7 ∕ 8 7 ∕ 8
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
… 1 0.435 a 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. The body of the screw is the unthreaded cylindrical portion of the shank where not threaded to the head; the shank being the portion of the screw from the point of juncture of the conical bearing surface and the body to the flat of the point. The length of thread L T is the distance measured from the extreme point to the last complete (full form) thread. Standard length increments of No. 0 through 1-inch sizes are as follows: 1 ∕ 16 inch for nominal screw lengths of 1 ∕ 8 through 1 ∕ 4 inch; 1 ∕ 8 inch for lengths of 1 ∕ 4 through 1 inch; 1 ∕ 4 inch for lengths of 1 inch through 3 1 ∕ 2 inches; 1 ∕ 2 inch for lengths of 3 1 ∕ 2 through 7 inches; and 1 inch for lengths of 7 through 10 inches, incl. For screw sizes over 1 inch, length increments are: 1 ∕ 2 inch for nominal screw lengths of 1 inch through 7 inches; 1 inch for lengths of 7 through 10 inches; and 2 inches for lengths over 10 inches. Threads shall be Unified external threads with radius root; Class 3A UNRC and UNRF series for sizes No. 0 through 1 inch and Class 2A UNRC and UNRF series for sizes over 1 inch to 1 1 ∕ 2 inches, incl. For manufacturing details not shown, including materials, see American National Standard ANSI/ASME B18.3-2012 and ANSI/ASME B18.3-1998 (for Spline driven fasteners). Socket dimensions are given in Table 11.
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