Email Us Today: 
Call Us Toll Free: 
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
Specifications
Product |
N/A Nuts |
Unit of Measure |
N/A English |
Nominal Size or Basic Major Dia. of Thread |
N/A 5/16 in |
Nominal Size or Basic Major Dia. of Thread (Decimal) |
N/A 0.3125 in |
Basic Width Across Flats (F) |
N/A 1/2 in |
Max. Width Across Flats (F) |
N/A 0.500 in |
Min. Width Across Flats (F) |
N/A 0.489 in |
Max. Width Across Corners (G) |
N/A 0.577 in |
Min. Width Across Corners (G) |
N/A 0.557 in |
Basic Thickness (H) |
N/A 15/16 in |
Max. Thickness (H) |
N/A 0.95 in |
Min. Thickness (H) |
N/A 0.93 in |
