• Unification. Bold type indicates products unified dimensionally with British and Canadian standards.
  • Smaller Sizes. For sizes 1/4 in. through 1 in., the nuts specified in Table are recommended.
  • Tops of Nuts. Tops of nuts shall be flat and chamfered. Diameter of the chamfer circle shall be equal to the maximum width across flats within a tolerance of minus 15 percent. The length of chamfer at hex corners shall be from 5 to 15 percent of the basic thread diameter. The surface of chamfer may be
  • more
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Nuts

Unit of Measure

English

Nominal Size or Basic Major Dia. of Thread

3-1/4 in

Nominal Size or Basic Major Dia. of Thread (Decimal)

3.2500 in

Basic Width Across Flats (F)

5 in

Max. Width Across Flats (F)

5.000 in

Min. Width Across Flats (F)

4.838 in

Max. Width Across Corners (G)

5.774 in

Min. Width Across Corners (G)

5.515 in

Basic Thickness (H)

3-1/4 in

Max. Thickness (H)

3.314 in

Min. Thickness (H)

3.124 in

Codes and Standards

Codes and Standards

ASME/ANSI B18.2.2 1987 (R 1999)
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