Structural Bolts (High Strength Friction Grip)
High strength structural bolts are used in steel-to-steel connections where the joint must resist shear and slip. They are tensioned to a specified preload so the friction between the plates carries the load — the bolt itself is not in shear. Supplied complete with the matching nut and two hardened washers, and torqued with a calibrated wrench or TC bolt gun.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A325 / A490 / GB/T 1228 – 1231 / EN 14399 |
| Type | High Strength Friction Grip (HSFG) / Slip-critical |
| Size Range | M16 – M30 (5/8" – 1-1/4") |
| Grade | 8.8 / 10.9 (ASTM A325 Type 1 / A490) |
| Material | Medium Carbon Steel / Alloy Steel |
| Surface Finish | Black Oxide, Hot Dip Galvanized, Dacromet |
| Supplied With | Matching nut (10H) + 2 hardened washers |
| Marking | Grade, size and manufacturer mark on head |
| MOQ | 500 pcs (standard), 2,000 pcs (custom) |
| Lead Time | 7-15 days (standard), 20-30 days (custom) |
| Packaging | Bulk cartons / Wooden pallets / Custom labeling |
Available Sizes
M16, M18, M20, M22, M24, M27, M30 with lengths 50mm – 200mm
Applications
- Steel structure erection
- Bridges and viaducts
- Industrial plant and pipe racks
- Transmission towers and masts
- Heavy machinery frames
- Prefabricated buildings
Certifications
ISO 9001:2015 certified. Material certificates (EN 10204 3.1/3.2). RoHS and REACH compliant.
Frequently Asked Questions
What is an HSFG (high strength friction grip) bolt?
HSFG bolts are preloaded to a controlled tension so that load transfers between the connected plies by friction, not bolt shear. This gives a stiff, slip-resistant connection required in bridges, steel structures and vibration-heavy construction.
What sizes are available?
Available sizes range from M16 – M30 (5/8" – 1-1/4"). Contact us with your required sizes and quantities for a quick quote.
What is the MOQ and lead time?
The MOQ is 500 pcs (standard), 2,000 pcs (custom). Lead time is 7-15 days (standard), 20-30 days (custom). Mixed-size containers and larger orders are negotiable — send us your requirement for a quick quote.
Do you provide material certificates?
Yes. Material test certificates per EN 10204 3.1 are available on request, and our manufacturing is ISO 9001:2015 certified. RoHS and REACH compliance documentation can also be provided.
