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IFI-128 is a standard developed through the procedures of Industrial Fasteners Institute. IFI-128 was first published in 1978 and reaffirmed, without technical change, in 1986 and in 2000.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Nuts

Unit of Measure

English

Nominal Size or Basic Major Dia. of Thread

5-3/4 in

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

5.7500 in

Basic Width Across Flats (F)

8-3/4 in

Max. Width Across Flats (F)

8.750 in

Min. Width Across Flats (F)

8.462 in

Max. Width Across Corners (G)

10.104 in

Min. Width Across Corners (G)

9.647 in

Basic Thickness (H)

17-1/4 in

Max. Thickness (H)

17.35 in

Min. Thickness (H)

17.15 in

Codes and Standards

Codes and Standards

IFI-128 2000