• Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • The minimum radius is one half of the value shown.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Round Head Bolts

Unit of Measure

English

Nominal Size or Basic Bolt Dia.

3/8 in

Nominal Size or Basic Bolt Dia. (Decimal)

0.3750 in

Max. Body Dia. (E)

0.388 in

Min. Body Dia. (E)

0.329 in

Max. Head Dia. (A)

0.844 in

Min. Head Dia. (A)

0.782 in

Max. Head Height (H)

0.208 in

Min. Head Height (H)

0.188 in

Max. Square Width (O)

0.388 in

Min. Square Width (O)

0.368 in

Max. Square Depth (P)

0.156 in

Min. Square Depth (P)

0.125 in

Max. Corner Radius on Square (Q)

0.047 in

Max. Fillet Radius (R)

0.031 in

Codes and Standards

Codes and Standards

ASME B18.5 1990 (R1998)
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