Machinery's Handbook, 31st Edition
Bolts 1683 American National Standard Round Head and Round Head Square Neck Bolts ANSI/ASME B18.5-2012 (R2017)
R H Round Head Square Neck Bolt P
Round Head Bolt
Q
H
O
E
E
R
45° Max
A
L
L
A
Body Dia., E
Corner Rad. on Square, Q
Dia. of Head, A
Height of Head, H
Fillet Rad., R Max.
Width of Square, O
Depth of Square, P
Nominal Size
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max. .031 .031 .031 .047 .047 .047 .078 .078 .094 .094
No. 10 0.199 .182 .469 .438 .114 .094 .031 .199 .185 .125 .094 1 ∕ 4 0.260 .237 .594 .563 .145 .125 .031 .260 .245 .156 .125 5 ∕ 16 0.324 .298 .719 .688 .176 .156 .031 .324 .307 .187 .156 3 ∕ 8 0.388 .360 .844 .782 .208 .188 .031 .388 .368 .219 .188 7 ∕ 16 0.452 .421 .969 .907 .239 .219 .031 .452 .431 .250 .219 1 ∕ 2 0.515 .483 1.094 1.032 .270 .250 .031 .515 .492 .281 .250 5 ∕ 8 0.642 .605 1.344 1.219 .344 .313 .062 .642 .616 .344 .313 3 ∕ 4 0.768 .729 1.594 1.469 .406 .375 .062 .768 .741 .406 .375 7 ∕ 8 0.895 .852 1.844 1.719 .469 .438 .062 .895 .865 .469 .438 1 1.022 .976 2.094 1.969 .531 .500 .062 1.022 .990 .531 .500
All dimensions are in inches unless otherwise specified. Threads are Unified Standard, Class 2A, UNC Series, in accordance with ANSI/ASME B1.1. For threads with additive finish, the maximum diameters of Class 2A shall apply before plating or coating, whereas the basic diameters (Class 2A maximum diameters plus the allowance) shall apply to a bolt after plating or coating. Bolts are designated in the sequence shown: nominal size (number, fraction or decimal equiva lent); threads per inch; nominal length (fraction or decimal equivalent); product name; material; and protective finish, if required. i.e.: 1 ∕ 2 -13 × 3 Round Head Square Neck Bolt, Steel .375-16 × 2.50 Step Bolt, Steel, Zinc Plated American National Standard T-Head Bolts ANSI/ASME B18.5-2012 (R2017)
K
E
A
R
B
H
L
Body Dia., E
Head Length, A
Head Width, B
Head Height, H
Head Rad., K Basic
Fillet Rad., R Max.
Nom. Size a or Basic Bolt Dia.
Max. Min. Max.
Min.
Max.
Min.
Max.
Min.
0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750
.260 .237 .500 .488 .280 .245 .204 .172 .324 .298 .625 .609 .342 .307 .267 .233 .388 .360 .750 .731 .405 .368 .331 .295 .452 .421 .875 .853 .468 .431 .394 .356 .515 .483 1.000 .975 .530 .492 .458 .418 .642 .605 1.250 1.218 .675 .616 .585 .541 .768 .729 1.500 1.462 .800 .741 .649 .601 .895 .852 1.750 1.706 .938 .865 .776 .724
.438 .500 .625 .875
.031 .031 .031 .031 .031 .062 .062 .062
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
.875 1.062 1.250 1.375 1.500
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1
1.0000 .062 a Where specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted. For information as to threads and method of bolt designation, see footnotes to preceding table. All dimensions are given in inches. 1.022 .976 2.000 1.950 1.063 .990 .903 .847
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