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  • 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.

1/4 in

Nominal Size or Basic Bolt Dia. (Decimal)

0.2500 in

Max. Body Dia. (E)

0.260 in

Min. Body Dia. (E)

0.237 in

Max. Head Length (A)

0.500 in

Min. Head Length (A)

0.488 in

Max. Head Width (B)

0.280 in

Min. Head Width (B)

0.245 in

Max. Head Height (H)

0.204 in

Min. Head Height (H)

0.172 in

Basic Head Radius (K)

0.438 in

Max. Fillet Radius (R)

0.031 in

Codes and Standards

Codes and Standards

ASME B18.5 1990 (R1998)