Hex nuts are six-sided, internally threaded fasteners, mated with bolts, studs, screws, and other externally threaded products. The addition of the hex nut ensures that the bolt, etc., stays in place.

Heavy hex nuts are wider across the flats and thicker than hex nuts.
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HEX MACHINE SCREW NUT, PLAIN (INCH)

1/2-13 HEAVY HEX NUT A563 GRADE A YELLOW ZINC PLATED
Web Price $183.96
HEX MACHINE SCREW NUT, PLAIN (INCH)

1/2 HEAVY HEX NUT A563 GRADE A YELLOW ZINC PLATED
Web Price $52.03
HEX MACHINE SCREW NUT, PLAIN (INCH)

5/8-11 HEAVY HEX NUT A563 GRADE A YELLOW ZINC PLATED
Web Price $191.94
HEX MACHINE SCREW NUT, PLAIN (INCH)

5/8 HEAVY HEX NUT A563 GRADE A YELLOW ZINC PLATED
Web Price $47.51
Diameter N/A 1/2 N/A 1/2 N/A 5/8 N/A 5/8
Pitch N/A Coarse
Length N/A
Material N/A A563 Grade A
Finish N/A Yellow Zinc Plated
Package Quantity N/A 700 N/A 100 N/A 400 N/A 50