OEM Hex Head Lag Screws & Hex Lag Bolts Manufacturer
Heavy-duty hex head lag screws (also known as hex lag bolts or large hexagon wood screws) are premium self-tapping fasteners engineered for high-strength wood framing and timber structures. Designed to drive directly into pilot holes without needing mating nuts, they provide superior pull-out resistance and load-bearing capacity.
T&Y Hardware manufactures lag bolts in high-grade 304/316 stainless steel, carbon steel, and brass. To ensure maximum outdoor durability, our carbon steel lag screws feature advanced corrosion-resistant finishes, including hot-dip galvanized (HDG), standard zinc plating, and black architectural coatings.
| Standard | Diameter Range | Length Range | Available Materials & Coatings | Primary Applications (Scenarios) |
| ASME B18.2.1
(Imperial) | 1/4″, 5/16″, 3/8″, 1/2″, 5/8″, 3/4″ | 1″ – 30″ | Carbon Steel (Grade 2/5), SS304/316
(HDG, Zinc Plated, Black Oxide) | Heavy wood framing, timber deck ledgers, log homes & utility pole hardware |
| DIN 571
(Metric) | M5, M6, M8, M10, M12, M16, M20, M24 | 20mm – 500mm | Class 4.8, Class 8.8, SS A2/A4
(HDG, Zinc Plated, Black Oxide) | Structural wood framing, timber sleepers, fencing & masonry anchoring |
Head Styles & Drive Variations
While standard 6-sided hex heads are the industry benchmark for heavy timber connections, complex engineering and architectural projects often demand specialized driver profiles. T&Y Hardware offers a versatile range of lag screw head configurations—engineered for maximum torque, optimal load distribution, and effortless installation across various wood framing applications.
The industry-standard 6-sided head design driven via standard sockets or impact drivers, delivering maximum torque and leverage for heavy-duty timber and wood framing connections.
Features an integrated flange or washer face that evenly distributes tension across wood surfaces, eliminating the need for a separate flat washer while speeding up installation.
A traditional 4-sided head providing a wide wrench-bearing surface and maximum torque capacity—ideal for rustic timber framing, architectural restoration, and pole line hardware.
Engineered with an internal socket drive for compact installation spaces or specialized architectural projects requiring a sleek, low-profile, or flush driver finish.
Why Choose T&Y Hardware as Your Lag Screw Partner?
- Sourcing reliable hex head lag screws from China shouldn’t be a gamble. As an ISO 9001-certified fastener manufacturer with over 23 years of export experience, T&Y Hardware provides the perfect balance of factory-direct pricing, engineering precision, and dependable supply chains.
- ISO 9001 Quality Assurance: Every step of our lag screw processing—from cold heading to thread rolling and surface coating—strictly complies with international quality management standards.
- End-to-End Technical Support: Our senior sales and R&D engineering teams offer complete project support, helping you select the ideal drive styles, thread lengths, and protective finishes for your exact wood framing or industrial applications.
- Proven Global Track Record: We serve as a long-term supply chain partner for leading distributors and contractors across North America, Europe, and Australia.
- Our certificate
Related Product
For standard requirements, we manufacture Class 4.8 (DIN 571) and Grade 2 (IFI/ASME) lag bolts using premium C1008 carbon steel. For high-strength Class 8.8 applications, we utilize C1035 steel with precise heat treatment. We also produce 304 and 316 Stainless Steel lag screws. Available protective coatings include Hot-Dip Galvanized (HDG), standard Zinc, Black Oxide/Black Zinc, Color Zinc, and Dacromet for high salt-spray resistance.
Standard hex lag screws feature a sharp gimlet point (cone-shaped threaded tip) paired with aggressive, deep coarse threads. This gimlet point allows the screw to bite smoothly into wood fibers, pulling itself tightly into pre-drilled pilot holes to prevent timber splitting in heavy wood framing.
Operating out of a 2,500-square-meter specialized workshop with a 500-ton monthly capacity, T&Y Hardware easily handles large-scale bulk orders. Our standard delivery lead time is 15 to 20 days for standard lag screws, and within 30 days for fully customized OEM/ODM orders.
We enforce a strict 3-stage Quality Control (QC) process: Raw Material Inspection upon arrival, Semi-Finished Dimensions Testing during production, and Final Inspection (including tensile strength, coating thickness, and salt-spray testing) before packaging. Full Material Test Certificates (MTC) are provided with every shipment.
While retail brands like Everbilt lag screws are convenient for small local repairs, high retail markups make them impractical for large construction projects or wholesale distribution. T&Y Hardware offers direct-from-factory bulk pricing, custom length/coating options, and container-load supply capabilities, significantly lowering your procurement costs.
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