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IFI-555:2005
Test Procedure for the Performance of Nonmetallic Resistant Element Prevailing-Torque Nuts - Metric Series
This standard establishes a conformance test procedure for metric nonmetallic resistant element prevailing-torque nuts with specified prevailing-torque requirements, in nominal sizes M4 thru M20 intended for application temperatures of - 45°C to 120°C. Both partial (less than 360°) and full circumference (360°) element designs are included.
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Industrial Fasteners Institute [ifi]
Industrial Fasteners Institute [ifi]