IFI 149 Large-Size Heavy Hex Screws

IFI-149 covered large-size heavy hex screws beyond ordinary ASME B18.2.1 dimensions. Drawing identifies heavy hex head, shank and length.

IFI 149 Large-Size Heavy Hex Screws technical drawing: IFI-149 covered large-size heavy hex screws beyond ordinary ASME B18.2.1 dimensions. Drawing identifies heavy hex head, shank and length.

Standard scope and dimension key

Scope	Head width	Head height	Length	Source
3 1/4–6 in	s	k	L	IFI-149 drawing
Heavy hex	Across flats	Under head	Under head	Verify each size
Thread	Unified series	—	—	Per order

Published scope is 3 1/4 through 6 in. This table gives dimension keys only; obtain per-size values and tolerances from the controlled standard drawing.