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  • Square machine screw nuts shall have tops and bottoms flat, without chamfer. The bearing surface shall be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg.
  • 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

Machine Screw Nuts

Unit of Measure

English

Nominal Size or Basic Thread Dia.

1/4 in

Nominal Size or Basic Thread Dia. (Decimal)

0.2500 in

Basic Width Across Flats (F)

7/16 in

Max. Width Across Flats (F)

0.438 in

Min. Width Across Flats (F)

0.423 in

Max. Width Across Corners (G)

0.619 in

Min. Width Across Corners (G)

0.581 in

Max. Thickness (H)

0.193 in

Min. Thickness (H)

0.178 in

Codes and Standards

Codes and Standards

ANSI/ASME B18.6.3 1998