5/16" Hex Lag Screws – Zinc Plated Steel

ASTM A307 Grade A Compliant – Cr+3 RoHS Compliant

Secure your framing and decking projects with 5/16" Zinc Plated Hex Lag Screws from Monster Bolts. Engineered for structural wood connections, these lag screws deliver reliable holding power for framing, deck ledger attachments, and outdoor builds. The zinc plating provides durable corrosion protection while maintaining affordability and high performance.

Key Specifications (Framing & Deck Use)

• Diameter: 5/16 inch
• Thread Size: 9 Threads Per Inch (9 TPI)
• Wrench Size (Across Flats): 1/2 inch
• Type: Hex Lag Screw (also known as Lag Bolt)
• System of Measurement: Inch (Imperial / US)
• Material: Zinc Plated Steel ASTM A307 Grade A, Cr+3 RoHS Compliant
• Specifications: Conforms to ASME B18.2.1

Material & Performance Advantages

• Structural Holding Power: Designed for framing and ledger connections where dependable shear and withdrawal strength matter.
• Zinc Corrosion Protection: Cr+3 zinc plating provides durable, cost-effective rust resistance for exterior use.
• A307 Grade A Steel: Delivers consistent performance for construction-grade applications.
• RoHS Compliant: Environmentally safe Cr+3 plating meets modern compliance standards.

Ideal Applications

• Deck framing and ledger attachments
• Exterior timber framing
• Fences, gates, and pergolas
• General structural wood fastening
• Outdoor construction projects

Installation Tips

• Pre-drill pilot holes to prevent wood splitting and ease installation.
• Use a 1/2" wrench or socket for proper torque and secure fit.
• Ensure proper pilot size and sufficient embedment into sound lumber for structural integrity.
• Confirm the lag screw is appropriate for your framing or decking load requirements.

Order Yours Today

Choose 5/16" Zinc Plated Hex Lag Screws for dependable, heavy-duty performance in structural framing and deck applications. Trusted by builders, contractors, and DIY professionals nationwide. Enjoy fast U.S. shipping and dedicated support from Monster Bolts.

✔️ Built for framing, decking, and outdoor construction

✔️ ASTM A307 Grade A, Cr+3 RoHS Compliant Zinc Plating

✔️ Reliable corrosion protection and strength for exterior use