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Jam nuts are tightened against the work surface and a finished or heavy hex nut is tightened agianst the jam to keep it from loosening
Thread Diameter-Pitch 1 3/4"-5 inches
Width Across the Flats 2 5/8" inches
Thickness/Height 31/32" inches
Manufactured to ASME B18.2.2 & SAE J995 specifications