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, HDG (INCH)

1/4-20 X 1 3/4 COUPLING NUT A563 GRADE A GALVANIZED
Web Price $470.98
A563 GRADE A HEX COUPLING NUT, HDG (INCH)

1/4-20 X 1 3/4 COUPLING NUT A563 GRADE A GALVANIZED
Web Price $41.90
A563 GRADE A HEX COUPLING NUT, HDG (INCH)

5/16-18 X 1 3/4 COUPLING NUT A563 GRADE A GALVANIZED
Web Price $216.09
A563 GRADE A HEX COUPLING NUT, HDG (INCH)

5/16-18 X 1 3/4 COUPLING NUT A563 GRADE A GALVANIZED
Web Price $23.10
A563 GRADE A HEX COUPLING NUT, HDG (INCH)

3/8-16 X 1 3/4 COUPLING NUT A563 GRADE A GALVANIZED
Web Price QUOTE
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
Length N/A 1 3/4
Material N/A A563 Grade A
Finish N/A Galvanized
Package Quantity N/A 1000 N/A 50 N/A 500 N/A 30 N/A 500