Torsional Shear Type High-Strength Bolts
Torsional Shear Type High-Strength Bolts, also known as Twist-Shear Bolts or Tension Control Bolts (TC Bolts), represent a pinnacle in structural fastening technology. Engineered for precision and reliability, these bolts are the preferred choice for demanding applications in steel construction, infrastructure, and heavy industry worldwide.
Key Features & Technical Advantages
- Precision Tension Control: The defining feature is the integrated torque-controlled shear groove (or splined end). During installation, this mechanism ensures the bolt reaches its optimal preload force precisely when the groove twists off, eliminating guesswork and guaranteeing consistent, safe, and verifiable tension every time.
- Superior Strength & Durability: Manufactured from high-grade alloy steel (typically Grade 10.9), these bolts undergo rigorous heat treatment (quenching and tempering) to achieve exceptional tensile strength, yield ratio, and fatigue resistance, far exceeding ordinary bolts.
- Enhanced Safety & Reliability: The twist-off installation method provides a visual and mechanical confirmation of correct tightening, significantly reducing the risk of under-tightening or over-tightening, which are common causes of structural failure.
- High Efficiency & Cost Savings: Installation is streamlined and compatible with automated power tools. This design can reduce on-site labor time by up to 30% compared to traditional bolt tightening methods, accelerating project timelines and lowering overall costs.
- Robust Corrosion Resistance: Available with various protective finishes such as hot-dip galvanizing or Dacromet coating, these bolts offer excellent long-term durability even in harsh outdoor or industrial environments.
Primary Applications
These shear-torsion resistant fasteners are ideally suited for critical connections requiring high integrity:
- Steel Frame Construction: For assembling beams, columns, and trusses in commercial buildings, industrial facilities, and warehouses.
- Bridge & Infrastructure Projects: In main girders, deck connections, and support structures where dynamic loads are prevalent.
- Transmission Towers & Wind Turbines: For connections that must withstand extreme weather conditions and sustained vibrations.
- Heavy Machinery & Equipment: In assemblies where reliable performance under shock and vibration is paramount.
Product Specifications & Standards
- Common Grades: Primarily Grade 10.9, the highest standard for structural bolts.
- Typical Sizes: Diameters range from M16 to M30, with lengths customizable from 45mm to 300mm to suit various connection thicknesses.
- Compliance: Premium products strictly conform to international standards such as GB/T 3632 and ISO 15077 or ISO 898-1, ensuring global acceptance and traceable quality.
Post time: 2026-03-16 14:33:00
