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The Hillman 661310 hex nut is a steel external hex fastener with a 5/16"-18 Unified National Coarse thread. It has a white/zinc exterior finish and is sold as a single packaged item. The part is intended for general-purpose hex nut fastening applications and the drive system is external hex for wrench installation.
Steel hex nut, 5/16"-18 Unified National Coarse thread, external hex drive, white/zinc finish, pack of 1
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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