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Timber bolts are heavy-duty fastening components designed specifically for secure wood-to-wood and wood-to-metal connections in structural applications where high shear strength and long-term stability are required. Commonly manufactured as per DIN 603 / ISO standards, they feature a large mushroom head and square neck that prevents rotation during tightening, ensuring a firm grip inside timber members. These fasteners are widely used in bridges, railway sleepers, decking systems, pergolas, and heavy timber framing structures where conventional bolts fail under dynamic or environmental loads.
| Parameter | Specification |
|---|---|
| Material | Carbon Steel, Stainless Steel (SS 304, SS 316), Alloy Steel |
| Grade | 4.6, 5.6, 8.8, A2-70, A4-80 |
| Size Range | M6 to M20 (Length: 20 mm to 200 mm) |
| Thread Type | Metric Coarse / UNC / UNF |
| Standards | DIN 603, ISO 8677, BS 1768 |
| Surface Finish | Plain, Hot Dip Galvanized, Zinc Plated, Black Oxide |
| Head Type | Mushroom Head with Square Neck |
| Tensile Strength | Up to 800 MPa (depending on grade) |
Timber bolts are used wherever strong, vibration-resistant fastening is required between timber components or timber-to-steel assemblies in structural environments.
Timber bolts are manufactured through cold forging and precision threading processes to ensure uniform head geometry and consistent square neck formation. Heat treatment is applied to achieve desired mechanical strength for higher-grade bolts. Each batch undergoes dimensional inspection, tensile strength testing, and coating thickness verification for galvanized variants.
Quality systems follow ISO 9001 guidelines with full lot traceability and material test certificates (MTC) provided for every shipment. KK Fasteners integrates multi-stage inspection protocols including surface finish validation and thread gauge testing to ensure compliance with DIN 603 and ISO standards for structural fastening reliability.
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Timber bolts are heavy-duty fasteners designed for securing timber-to-timber or timber-to-metal connections. They feature a large mushroom head and a square neck that prevents rotation during installation, making them suitable for structural applications such as bridges, framing systems, and outdoor wooden constructions.
Timber bolts are typically manufactured from carbon steel, stainless steel (SS 304 and SS 316), and alloy steel. Carbon steel provides high strength for structural use, while stainless steel offers superior corrosion resistance in outdoor and marine environments. Alloy steel is used where higher load capacity is required.
Timber bolts are commonly produced according to DIN 603, ISO 8677, and BS 1768 standards. These standards ensure dimensional accuracy, mechanical performance, and compatibility with international construction and engineering requirements.
They are widely used in timber bridges, railway sleepers, decking systems, roof trusses, and heavy timber framing. They are also suitable for marine structures like docks and jetties where strong and corrosion-resistant fastening is essential.
Selection depends on load requirements, environmental exposure, and material compatibility. For outdoor or coastal applications, stainless steel or galvanized bolts are preferred. For heavy structural loads, higher tensile grades such as 8.8 or A4-80 are recommended.
For structural projects demanding reliable load transfer and long-term durability, timber bolts remain a critical fastening solution. KK Fasteners delivers precision-engineered bolts with strict adherence to DIN standards, material traceability, and global export support for infrastructure-grade applications.
Request a technical quotation or connect with the engineering team at KK Fasteners to get specification sheets and bulk pricing tailored to your project requirements.
