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Box of 50 zinc-plated steel coupling nuts, 7/8 inch long

L.H. DOTTIE

L.H. DOTTIE RC4 Coupling Nut 5/16-18 Steel Zinc 7/8 in 50 PK

SKU CH-X8ZY-FDFEF

Zinc-plated steel coupling nuts, 5/16-18 thread, 7/8 inch long, pack of 50

  • Product typeNuts
  • Secure threaded connections with 5/16-18 coupling nuts
  • Corrosion-resistant zinc-plated steel for lasting durability
  • Extended 7/8 in length provides extra grip space
  • 50-piece pack covers multiple installation jobs
  • Free shipping on orders of 75 or more

Threaded coupling nut 5/16-18

This pack supplies fifty steel coupling nuts with 5/16-18 threads and a 7/8 in overall length. Zinc plating protects the surface against corrosion in damp or outdoor conditions. The hardware suits maintenance crews, fabrication shops and DIY builders who need to join two externally threaded rods or studs. Bulk quantity reduces reorder frequency on recurring jobs.

Corrosion resistance and installation

Zinc plating forms a sacrificial barrier that slows rust formation on the steel substrate during normal exposure. The nuts install with a standard wrench or socket sized for the 5/16-18 thread form, requiring no special tools or lubricants. Tightening torque follows common practice for this thread size and material combination.

Build integration

Each nut bridges two male-threaded components, effectively extending the reach of anchor rods, all-thread or machine screws. The 7/8 in body length provides adequate grip engagement for typical structural or mechanical connections. Pack of fifty supports multiple assemblies or spares inventory without additional packaging waste.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $25.99
Pricier than about 58% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameDOTTIE
Product typeNuts

Questions about this item

How do I install the 5/16-18 coupling nut on threaded rod, and what step causes cross-threading?

Start the nut by hand until at least two full threads engage before using a wrench; forcing it with a tool on the first turn is what cross-threads the 5/16-18 threads.

What maintenance or replacement will the zinc-plated steel nuts need over time?

Inspect the zinc coating for white corrosion powder; once the plating is breached and red rust appears on the steel, replace the affected nuts.

What limit appears first when the coupling nut is under sustained tensile load?

The 5/16-18 thread engagement length will reach its proof-load limit before the 7/8 in body yields, so the joint fails at the threads first.

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