5/16 X 4 Hex Lag Screw
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5/16 X 4 Hex Lag Screw
Engineered for strong wood-to-wood or metal-to-wood connections, the 5/16 x 4 Hex Lag Screw is a heavy-duty fastener essential for construction and framing projects. Its hex head allows for high-torque installation with standard tools, while the coarse threads provide superior grip and pull-out resistance in lumber.
- Low Carbon Steel
- Conforms to ASTM A307
- 5/16" Diameter x 4" Length
- Hex Head for Wrench/Socket
Our 5/16 x 4 Hex Lag Screws are manufactured from industrial-grade low carbon steel, ensuring dependable strength and durability for general construction applications. These fasteners are designed to meet the performance requirements of ASTM A307, providing a minimum tensile strength suitable for light to medium-duty framing and structural connections. The hex head is cold-formed for precise dimensions, allowing for secure engagement with wrenches and sockets. A gimlet point ensures easy starting in wood, often without the need for extensive pre-drilling in softer materials.
Ideal for both commercial and residential construction, these hex lag screws are the go-to solution for fastening ledgers, deck frames, and heavy timber. Their robust design makes them suitable MRO supplies in industrial settings for securing machinery to wood floors or building support structures. Available from our Los Angeles warehouse, these commercial-grade lag screws provide the reliable performance required by contractors and fabricators for projects demanding strong, secure wood connections. Contact us for information on bulk 5/16 X 4 Hex Lag Screw orders.
Specifications
- Material: Low Carbon Steel
- Standards: ASTM A307
- Strength/Tensile: Approx. 60,000 psi (Typical for ASTM A307 Grade A)
- Dimensions: 5/16" Diameter x 4" Length
- Finish: Zinc-Plated (ASTM B633) or Hot-Dip Galvanized
- Certifications: Mill Test Reports (MTR) available upon request.
Applications
- Construction: Fastening deck ledgers, framing members, and stair stringers.
- Outdoor Structures: Assembling pergolas, gazebos, fences, and retaining walls.
- Industrial MRO: Anchoring light machinery, shelving, and support brackets to wood structures.
- Fabrication: Securing metal plates, brackets, or hardware to heavy timber or posts.
Target Users
Used by general contractors, framers, deck builders, and maintenance personnel for projects requiring strong, reliable wood fasteners. Ideal for anyone needing bulk construction hardware from our Los Angeles industrial supply warehouse.
Finish Options
Our 5/16 x 4 Hex Lag Screws are commonly stocked with a Zinc-plated finish for moderate corrosion resistance in indoor or dry environments. For superior protection against weather and moisture in outdoor applications, a Hot-Dip Galvanized (HDG) finish is also available.
How to Measure
Lag screws are measured by two key dimensions: Diameter (the shank thickness) and Length (measured from under the head to the tip). Ensure you select a length that provides sufficient embedment into the base material for maximum holding power.
Example: To order this product, specify: Hex Lag Screw, 5/16" x 4", Zinc-Plated.
Order Checklist
- Product name and required dimensions (e.g., 5/16" x 4")
- Material specification and quantity
- Surface finish requirements (e.g., Zinc or Galvanized)
- Certifications required (Mill Test Report - MTR)
- Special handling or delivery requirements
Quick Facts
- Product
- 5/16 X 4 Hex Lag Screw
- Material
- Low Carbon Steel
- Standards
- ASTM A307
- Key Properties
- Hex head for high torque, coarse threads for wood grip, general-purpose strength.
- Primary Applications
- Construction, Framing, Deck Building, MRO
- Location
- Los Angeles warehouse - Same-day pickup available
Available Sizes
We stock a wide range of hex lag screw diameters from 1/4" to 3/4" and lengths from 1" to 12". Our Los Angeles warehouse has bulk quantities ready for same-day pickup.
Custom sizes and finishes may be available by special order.
Contact for Sizing