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The RFB-392-RFAB zinc finished steel Nut with a Nylon Insert. The Nylon insert helps with the nut from backing off or losing it’s clamping strength due to vibrations over time.
Wrench Size- 7/16 inch
Type-Nylon Insert Lock Nut
Material- Steel
Finish- Zinc
Dia/Thread Size- 1/4 inch -20
Thickness- 0.328 inch
Grade- 2