5/16 X 3 Hex Lag Screws
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5/16 X 3 Hex Lag Screws
Engineered for heavy-duty wood applications, these 5/16" x 3" Hex Lag Screws provide exceptional holding power and durability. Featuring a hex head for high-torque installation and coarse threading for a secure grip in lumber, they are the ideal fastener for construction, framing, and MRO projects.
- Low Carbon Steel Construction
- Conforms to ASTM A307 / SAE J429 Standards
- Min. 60,000 PSI Tensile Strength
- Hex Head for High-Torque Driving
Bobco's 5/16 x 3 Hex Lag Screws are manufactured from industrial-grade low carbon steel, ensuring consistent performance and strength for light-duty to medium-duty applications. These fasteners meet the stringent requirements of ASTM A307 and SAE J429 standards, guaranteeing a minimum tensile strength of 60,000 PSI. The precision-formed hex head is designed for use with standard wrenches and sockets, allowing for easy, high-torque installation. A deep, coarse thread pattern provides a robust bite into wood, preventing pull-out and ensuring a long-lasting, secure connection in structural and non-structural joints.
These industrial-grade lag screws are essential for a wide range of commercial and MRO applications in the Los Angeles area. They are commonly used for attaching ledger boards for decks, securing heavy fixtures to wood studs, and assembling large-scale timber frames. Their reliability makes them a go-to choice for contractors, fabricators, and maintenance teams for projects requiring strong wood-to-wood or metal-to-wood connections. From new construction projects to on-site repairs, these fasteners deliver the holding power required for safe and durable results.
Specifications
- Material: Low Carbon Steel
- Standards: SAE J429 / ASTM A307
- Strength/Tensile: 60,000 psi minimum
- Dimensions: Diameter: 5/16", Length: 3"
- Finish: Zinc-Plated (ASTM B633), Hot-Dip Galvanized
- Certifications: Mill Test Reports (MTR) available upon request
Applications
- Construction & Framing: Securing beams, ledger boards, and structural wood components.
- Deck & Patio Building: Attaching support posts, joists, and railings securely to main structures.
- Landscaping & Outdoor Projects: Assembling retaining walls, large planters, and other outdoor wood structures.
- Industrial MRO: Anchoring heavy equipment, machinery, or shelving to wood floors, walls, or platforms.
Target Users
Ideal for general contractors, framers, deck builders, and MRO professionals who require robust, reliable fasteners for wood-based applications. They are also suitable for fabricators attaching metal hardware to wooden bases.
Finish Options
Our hex lag screws are available in multiple finishes to suit different environmental conditions. A standard Zinc Plating (per ASTM B633) offers good corrosion resistance for indoor or protected outdoor use. For maximum durability and protection against weathering in exterior applications, we recommend a Hot-Dip Galvanized (HDG) finish.
How to Measure
Lag screws are specified by their nominal diameter (shank thickness) and their length. The length is measured from the flat surface under the hex head to the sharp tip of the screw.
Example: 5/16" (Diameter) x 3" (Length) Hex Lag Screw, Zinc-Plated
Order Checklist
- Product name and required dimensions (Diameter x Length)
- Material specification and required quantity
- Confirm if washers are needed for the application
- Surface finish requirements (e.g., Zinc-Plated or Hot-Dip Galvanized)
- Certifications required (Mill Test Report - MTR)
- Special handling or delivery requirements
Quick Facts
- Product
- 5/16 X 3 Hex Lag Screws
- Material
- Low Carbon Steel
- Standards
- ASTM A307 / SAE J429
- Key Properties
- Excellent holding power in wood, hex head for high-torque driving, corrosion-resistant finishes.
- Primary Applications
- Wood Construction, Framing, Decks, MRO
- Location
- Los Angeles warehouse - Same-day pickup available
Available Sizes
We stock a comprehensive range of hex lag screws with diameters from 1/4" to 3/4" and lengths from 1" to 12". Available from our Los Angeles warehouse for immediate pickup in both zinc-plated and hot-dip galvanized finishes.
Bulk pricing and special orders are available upon request.
Contact for Sizing