US / Inch - Grade 5 Finished Hex Nuts. These are standard Hex Nuts (also called Finished Hex Nuts) that are made from Medium Carbon Zinc-plated Steel (RoHS compliant Cr+3 zinc).

Available sizes:

1/4"-20

1/4"-28 (Fine)

5/16"-18

5/16"-24 (Fine)

3/8"-16

3/8"-24 (Fine)