Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Round Head Bolts

Unit of Measure

English

Nominal Size or Basic Bolt Dia.

5/8 in

Nominal Size or Basic Bolt Dia. (Decimal)

0.6250 in

Max. Body Dia. (E)

0.642 in

Min. Body Dia. (E)

0.605 in

Max. Head Dia. (A)

1.495 in

Min. Head Dia. (A)

1.375 in

Min. Flat on Head (F)

0.038 in

Max. Head Height (H)

0.316 in

Min. Head Height (H)

0.272 in

Max. Square Width (O)

0.642 in

Min. Square Width (O)

0.616 in

Max. Square Depth (P)

0.406 in

Min. Square Depth (P)

0.375 in

Max. Corner Radius on Square (Q)

0.078 in

Codes and Standards

Codes and Standards

ASME B18.5 1990 (R1998)
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