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Sales Systems Limited Products and Services > Fasteners > Nuts > Hex Nuts > Hex Coupling Nuts > Item # HCN03750XXX  
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Item # HCN03750XXX, Hex Coupling Nut, 0.3750" Nominal Dia.

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.

Manufacturer  · Specifications  · Codes and Standards



Industrial Fasteners Institute




Unit of Measure


Nominal Size or Basic Major Dia. of Thread

3/8 in

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

0.3750 in

Basic Width Across Flats (F)

9/16 in

Max. Width Across Flats (F)

0.562 in

Min. Width Across Flats (F)

0.551 in

Max. Width Across Corners (G)

0.650 in

Min. Width Across Corners (G)

0.628 in

Basic Thickness (H)

1-1/8 in

Max. Thickness (H)

1.13 in

Min. Thickness (H)

1.11 in

Codes and Standards

Codes and Standards

IFI-128 2000

Distributor of Industry Standard and Military Specification Threaded Fasteners