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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
Specifications
Product |
N/A Nuts |
Unit of Measure |
N/A English |
Nominal Size or Basic Major Dia. of Thread |
N/A 2-1/2 in |
Nominal Size or Basic Major Dia. of Thread (Decimal) |
N/A 2.5000 in |
Basic Width Across Flats (F) |
N/A 3-7/8 in |
Max. Width Across Flats (F) |
N/A 3.875 in |
Min. Width Across Flats (F) |
N/A 3.750 in |
Max. Width Across Corners (G) |
N/A 4.474 in |
Min. Width Across Corners (G) |
N/A 4.275 in |
Basic Thickness (H) |
N/A 7-1/2 in |
Max. Thickness (H) |
N/A 7.55 in |
Min. Thickness (H) |
N/A 7.44 in |
