5/16"-18 Grade 2 Hex Nut Zinc Plated (Coarse Thread)

Reliable Fastening for General Projects: 5/16"-18 Grade 2 Zinc Hex Nuts

These are standard 5/16"-18 Grade 2 Hex Nuts (nominal size close to 8mm), designed for coarse thread (18 TPI) bolts. Featuring uniform threads for smooth installation, they require a common 1/2" wrench or socket for tightening.

Manufactured to Grade 2 specifications, these steel nuts are suitable for general fastening tasks not requiring high strength. The zinc-plated finish offers moderate corrosion resistance, primarily for indoor or dry conditions. This product is available in 100-piece bags or 2000-piece boxes to meet various project needs.

Specs

• Product Type: Standard Hex Nut
• Size: 5/16 inch Nominal Diameter (~8mm equivalent)
• Thread Pitch: 18 TPI (Unified National Coarse - UNC)
• Grade: Grade 2 (Low Carbon Steel)
• Material: Steel
• Finish: Zinc Plated
• Required Wrench/Socket Size: 1/2 inch
• Inside Diameter: 0.3125 in (5/16")
• Outside Diameter (Across Flats): 1/2 in
• Thread Direction: Right Hand
• Weight (Approx. per piece): 0.01 lbs
• Packaging Options: 100 pcs/bag, 2000 pcs/box

Features

• Standard Size & Thread: Fits common 5/16" diameter bolts (near 8mm) with standard 18 TPI coarse threads for wide compatibility.
• Reliable Grade 2 Strength: Offers dependable holding power for general-purpose fastening in construction, assembly, and DIY projects.
• Zinc Plated Protection: Standard hex nut zinc plated finish provides moderate resistance against rust and corrosion, suitable for indoor or dry condition use.
• Smooth, Easy Threading: Uniform manufacturing ensures clean threads for easy starting and tightening without binding or burrs.
• Uses Standard 1/2" Wrench: Tightens securely using a common 1/2 inch wrench or socket, readily available in most toolsets.
• Bulk Value Packaging: Available in convenient, clearly packaged 100-piece bags or cost-effective 2000-piece boxes to suit project size and budget.

FAQ

What applications are these Grade 2 nuts suitable for?

They are ideal for general-purpose uses like DIY projects, light machinery assembly, wood framing, furniture repair, and other tasks where high tensile strength is not critical. They should be paired with compatible low-strength bolts (e.g., Grade 2 or ASTM A307).

Can I use these hex nuts outdoors?

The zinc plating offers moderate protection, best suited for indoor or dry environments. For outdoor applications exposed to weather or treated lumber, a Hot Dip Galvanized (HDG) or Stainless Steel nut is recommended for better corrosion resistance.

What size wrench tightens these nuts?

You will need a standard 1/2 inch wrench or socket.