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IFI-155:2005
Test Procedure for the Performance of Nonmetallic Resistant Element Prevailing-Torque Nuts
This standard establishes a test procedure for nonmetallic resistant element prevailing-torque nuts having coarse threads, to determine their conformance with specified prevailing-torque requirements in nominal sizes #10 thru 1 in. intended for application temperatures of - 49°F to 250°F. Both partial (less than 360°) and full circumference (360°) element designs are included.
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Industrial Fasteners Institute [ifi]