H1 What Is a Large Hex‑Head Structural Bolt
A large hex‑head structural bolt (also‑called heavy hex structural bolt) features an enlarged hexagonal bolt‑head. The wider contact surface spreads tightening torque evenly, prevents wrench slipping and resists surface abrasion during installation.
Structural bolts are sold as complete assembly sets, including bolt, heavy‑duty nut and hardened flat washer.
The most widely‑used strength rating is Grade 10.9S. The letter S stands for structural‑purpose fastener, dedicated for steel‑structure engineering rather than regular machinery assembling.
- Grade‑8.8S: Minimum tensile strength 800MPa
- Grade‑10.9S: Minimum tensile strength 1040 MPa, yield strength 900MPa
H2 Key Advantages of Heavy Hexagon Structural Bolts
- 1.High Shear and Tensile Capacity After proper pre‑tightening with torque wrench, these bolts generate powerful clamping force for friction‑type steel connections, resisting vibration, dynamic load and seismic shaking.
- 2.Large Hex‑Head Anti‑slip Design Enlarged hex head bears bigger wrench contact‑area. Workers apply high installation torque without slipping or damaging bolt corners.
- 3.Multiple Surface‑treatment Choices
- Black‑oxide finish: Most popular for indoor steel workshops, low‑cost, good anti‑rust property
- Hot‑dip galvanized: Outdoor bridge, tower construction, superior outdoor corrosion resistance
- Dacromet coating: Marine‑side, humid and harsh corrosive environments
- 4.Detachable and Easy‑to‑Maintain Welded connections are permanent. Structural bolt joints can be disassembled, inspected, repaired and replaced during routine steel‑structure maintenance, lowering long‑run engineering cost.
Post time: 2026-08-06 17:30:35
