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IFI-100/107:2002
Prevailing-Torque Type Steel Hex and Hex Flange Nuts Regular and Light Hex Series
This standard establishes the dimensional, mechanical, and performance requirements for three grades of prevailing-torque type steel hex nuts in sizes No. 4 thru 1-1/2 in., and two grades of prevailing-torque type steel hex flange nuts in sizes 1/4 thru 3/4 in.
Industrial Fasteners Institute [ifi]