3/8 X 4 Hex Lag Screws (C)
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3/8 X 4 Hex Lag Screws (C)
Engineered for superior holding power in wood applications, these 3/8" x 4" hex lag screws are essential for construction, framing, and MRO projects. Their hex head allows for high-torque installation, while the coarse thread design ensures a secure grip in lumber and posts.
- Low Carbon Steel
- Meets ASTM A307 Specifications
- 3/8" Diameter x 4" Length
- Wood Construction & Framing
These hex lag screws are manufactured from high-quality low carbon steel, conforming to the strength and material requirements outlined in ASTM A307 standards. This ensures a minimum tensile strength of approximately 60,000 psi, providing robust and reliable fastening for light to medium-duty structural applications. The standard zinc plating (per ASTM B633) offers excellent corrosion resistance, making them suitable for both interior and exterior use where exposure to the elements is a concern. The gimlet point and coarse thread pitch are specifically designed to displace wood fibers and create a strong, lasting connection.
Ideal for projects requiring a strong wood-to-wood or metal-to-wood connection, 3/8 x 4 hex lag screws are a staple in the construction and fabrication industries. Common uses include attaching ledgers to structural members, securing heavy-duty framing, assembling decks, and mounting machinery to wood floors. Their durability and ease of installation with a standard socket or wrench make them a preferred choice for professional contractors, fabricators, and MRO teams in the Los Angeles area requiring dependable commercial-grade hardware for their projects.
Specifications
- Material: Low Carbon Steel
- Standards: ASTM A307, ASME B18.2.1 (Dimensional)
- Strength/Tensile: 60,000 psi (Minimum)
- Dimensions: 3/8" Diameter x 4" Length, Coarse Thread
- Finish: Zinc Plated (ASTM B633)
- Certifications: Mill Test Reports (MTR) available upon request.
Applications
- Construction: Fastening ledgers, deck framing, and securing structural posts.
- Framing: Joining heavy lumber in residential and commercial framing applications.
- Landscaping: Assembling retaining walls, pergolas, and other outdoor wood structures.
- MRO & Industrial: Mounting equipment, brackets, and fixtures to wood surfaces.
Target Users
These industrial-grade lag screws are used by general contractors, framing crews, deck builders, and maintenance professionals. They are essential for any project requiring a strong, high-torque fastener for wood assembly.
Finish Options
Our standard 3/8 x 4 Hex Lag Screws come with a clear zinc-plated finish for good corrosion resistance. For projects requiring enhanced weather protection, Hot-Dip Galvanized (HDG) options may be available via special order. Contact our Los Angeles sales team for availability.
How to Measure
Lag screws are measured by their nominal diameter (shank diameter) and length. The length is measured from under the flat bottom of the hex head to the tip of the screw. The hex head size corresponds to the nominal diameter.
Example: To order this product, specify '3/8 x 4 Hex Lag Screws, Zinc Plated'.
Order Checklist
- Product name and required dimensions
- Grade/material specification and quantity
- Cutting instructions (if applicable)
- Surface finish requirements
- Certifications required (Mill Test Report - MTR)
- Special handling or delivery requirements
Quick Facts
- Product
- 3/8 X 4 Hex Lag Screws (C)
- Material
- Low Carbon Steel
- Standards
- ASTM A307
- Key Properties
- 60,000 psi tensile strength, hex head for high torque, coarse thread for wood grip, zinc-plated.
- Primary Applications
- Wood Construction, Framing, Decks, 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". Bulk quantities of industrial-grade lag screws are available for immediate pickup at our Los Angeles warehouse.
Custom sizes and cutting services are available.
Contact for Sizing