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.
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Unit of Measure
Items
Hex Coupling Nuts

Hex Coupling Nut, 0.2500" Nominal Dia.
Hex Coupling Nuts

Hex Coupling Nut, 0.3125" Nominal Dia.
Hex Coupling Nuts

Hex Coupling Nut, 0.3750" Nominal Dia.
Hex Coupling Nuts

Hex Coupling Nut, 0.4375" Nominal Dia.
Hex Coupling Nuts

Hex Coupling Nut, 0.5000" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Nuts
Codes and Standards N/A IFI-128 2000
Unit of Measure N/A English
Nominal Size or Basic Major Dia. of Thread N/A 1/4 in N/A 5/16 in N/A 3/8 in N/A 7/16 in N/A 1/2 in
Nominal Size or Basic Major Dia. of Thread (Decimal) N/A 0.2500 in N/A 0.3125 in N/A 0.3750 in N/A 0.4375 in N/A 0.5000 in
Basic Width Across Flats (F) N/A 3/8 in N/A 1/2 in N/A 9/16 in N/A 11/16 in N/A 3/4 in
Max. Width Across Flats (F) N/A 0.375 in N/A 0.500 in N/A 0.562 in N/A 0.688 in N/A 0.750 in
Min. Width Across Flats (F) N/A 0.365 in N/A 0.489 in N/A 0.551 in N/A 0.675 in N/A 0.736 in
Max. Width Across Corners (G) N/A 0.433 in N/A 0.577 in N/A 0.650 in N/A 0.794 in N/A 0.866 in
Min. Width Across Corners (G) N/A 0.416 in N/A 0.557 in N/A 0.628 in N/A 0.769 in N/A 0.839 in
Basic Thickness (H) N/A 3/4 in N/A 15/16 in N/A 1-1/8 in N/A 1-5/16 in N/A 1-1/2 in
Max. Thickness (H) N/A 0.76 in N/A 0.95 in N/A 1.13 in N/A 1.32 in N/A 1.51 in
Min. Thickness (H) N/A 0.740 in N/A 0.93 in N/A 1.11 in N/A 1.30 in N/A 1.49 in
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