High-Strength Bolt for Steel Structure (Grade 10.9)

Basic Info

The Torque-Control High-Strength Bolt is a specialized bolt set designed for friction-grip connections in steel structures.Property Class 10.9.Its unique feature is a splined end("twist-off nib").Installation uses a special electric wrench to tighten until the nib shears off,ensuring the bolt achieves a precise,constant predetermined tension(preload).It is a core fastener for critical load-bearing joints in steelwork.

Key attributes

Origin

China

Surface Finish

Hot-dip galvanized

Material

Alloy Structural Steel

Standard

GB/T 3632

Customer reviews

James Carter · Maintenance Engineering Supervisor

The Grade 10.9 high-strength bolts from your company were used in our steel structure platform. After two years of full-load operation, all connections remain completely tight with excellent torque retention. Such stability in a high-vibration environment demonstrates outstanding anti-loosening and fatigue resistance, helping us avoid costly downtime for maintenance.

David Müller · Procurement & Quality Manager

As a procurement party, we value consistent quality in bulk products the most. The Grade 8.6 hex head bolts we purchased from your company showed almost no deviation in mechanical performance tests (hardness, tensile strength) across five consecutive batches, with a 100% pass rate in thread gauge inspection. This consistency greatly ensures the efficiency and safety of our assembly line.

Dr. Emma Fischer · Chief R&D Engineer

"In the development of precision optical instruments, we have strict requirements for fastener dimensional tolerances and magnetic properties. The non-magnetic stainless steel miniature bolts (M1.6-M3) provided by your company fully meet the drawing tolerance requirement of ±0.015mm. Their vacuum degassing process effectively prevents contamination of the optical system by micro-gas emissions."

Product Description

Product Characteristics:

Key feature is(intuitive and reliable installation quality control)–sheared nib indicates(qualified)installation.Generates massive,stable preload;force is transferred between connected plates via friction(not bolt shear),resulting in high joint stiffness and excellent fatigue resistance.The set includes a heavy hex bolt,one high-strength nut,and one hardened washer to ensure system performance.

Product Specifications:

Conforms to ASTM A325(US)or GB/T 3632(Chinese)standards.Common diameters:M16,M20,M22,M24,M27,M30.Length refers to the plain shank length(excluding nib),calculated precisely based on total connected material thickness.The matching nut is Grade 10H,washer hardness HRC 35-45.

Product Applications:

Specifically used for on-site connection of critical load-bearing parts in building steel structures(factories,stadiums,skyscrapers),bridge steel box girders/trusses,heavy industrial equipment frames,power transmission towers,etc.It is a vital component ensuring the overall safety and stability of steel structures.

Basic Info

Key attributes

Customer reviews

Product Description

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Product Specifications:

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