Coupling nuts have long, hexagonal bodies. They are used to hold a threaded rod or machine screw at each end.
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A563 GRADE A HEX COUPLING NUT, PLAIN (INCH)

1/4-20 X 1 3/4 COUPLING NUT A563 GRADE A
Web Price $237.83
A563 GRADE A HEX COUPLING NUT, PLAIN (INCH)

1/4-28 X 7/8 COUPLING NUT A563 GRADE A
Web Price $337.79
A563 GRADE A HEX COUPLING NUT, PLAIN (INCH)

5/16-18 X 1 3/4 COUPLING NUT A563 GRADE A
Web Price $240.53
A563 GRADE A HEX COUPLING NUT, PLAIN (INCH)

5/16-24 X 7/8 COUPLING NUT A563 GRADE A
Web Price $352.64
A563 GRADE A HEX COUPLING NUT, PLAIN (INCH)

3/8-16 X 1 3/4 COUPLING NUT A563 GRADE A
Web Price $242.76
Diameter N/A 1/4 N/A 1/4 N/A 5/16 N/A 5/16 N/A 3/8
Pitch N/A Coarse N/A Fine N/A Coarse N/A Fine N/A Coarse
Length N/A 1 3/4 N/A 7/8 N/A 1 3/4 N/A 7/8 N/A 1 3/4
Material N/A A563 Grade A
Finish N/A Plain
Package Quantity N/A 500 N/A 2500 N/A 500 N/A 2000 N/A 500