American National Standard Round Head Ribbed Neck Bolts ANSI/ASME B18.5-2012 (R2017)
90° Approx.
H P
M
N
E
O
R
L
A
Depth Over Ribs, P
Head to Ribs, M For Lengths of
For Lengths of
Number of Ribs, N Approx.
Dia. Over Ribs, O
Fillet Radius, R
Body Diameter, E
Head Diameter, A
Head Height, H
Nominal Size a or Basic Bolt Diameter
7 ∕ 8 in. and Shorter
1 in. and Longer
7 ∕ 8 in. and Shorter
1 in. and 1 1 ∕ 8 in. ± 0.031
1 ∕ 4 in. and Longer
Max.
Min. 0.182 0.237 0.298 0.360 0.421 0.483 0.605 0.729
Max. 0.469 0.594 0.719 0.844 0.969 1.094 1.344 1.594
Min. 0.438 0.563 0.688 0.782 0.907 1.032 1.219 1.469
Max. 0.114 0.145 0.176 0.208 0.239 0.270 0.344 0.406
Min. 0.094 0.125 0.156 0.188 0.219 0.250 0.313 0.375
± 0.031 b
Min. 0.210 0.274 0.340 0.405 0.470 0.534 0.660 0.785
Max. c 0.031 0.031 0.031 0.031 0.031 0.031 0.062 0.062
No. 10 0.1900 0.199
0.031† 0.031† 0.031† 0.031† 0.031† 0.031†
0.063 0.063 0.063 0.063 0.063 0.063 0.094 0.094
9
0.250 0.250 0.250 0.250 0.250 0.250 0.313 0.313
0.407 0.407 0.407 0.407 0.407 0.407 0.438 0.438
0.594 0.594 0.594 0.594 0.594 0.594 0.625 0.625
0.2500 0.260 0.3125 0.324 0.3750 0.388 0.4375 0.452 0.5000 0.515 0.6250 0.642 0.7500 0.768
10 12 12 14 16 19 22
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2 5 ∕ 8 3 ∕ 4
0.094 0.094
a Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. b Tolerance on the No. 10 through 1 ⁄ 2 in. sizes for nominal lengths 7 ⁄ 8 in. and shorter shall be + 0.031 and − 0.000. c The minimum radius is one half of the value shown. All dimensions are given in inches unless otherwise specified. For information as to threads and method of designating bolts, see following table.
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