Towing chain Grade 43

steelcarbon steelheavy-duty

Product Overview

• Grade 43 Chain Self Color – Full Drum is a high-strength carbon steel utility chain manufactured in accordance with ASTM International specifications (ASTM A391 & ASTM A413) and NACM dimensional and performance requirements.
• Produced by an electrically welded process using calibrated low carbon steel, delivering a superior strength-to-weight ratio compared to Grade 30 proof coil chain.
• The chain features a self color (black mill finish) surface that preserves the original metallurgical structure of the steel without additional coating processes, ensuring consistent mechanical performance and eliminating coating-induced risks.

Material & Manufacturing Process (Why It Is Durable)

• Low carbon steel base material: high ductility, good weldability, stable mechanical performance under repeated loading.
• Electronically welded construction (electrical resistance welding): uniform weld penetration, consistent link geometry and high joint strength.
• Controlled link geometry per NACM tolerances: even load distribution, reduced stress concentration, improved fatigue resistance.
• Self color (black mill finish): retains original steel surface, avoids coating-induced microstructural changes, and allows easier visual inspection for wear and deformation.

Mechanical Performance & Strength Advantage

• Compared with Grade 30 proof coil chain, Grade 43 offers approximately 50% higher working load limit, improved tensile strength and better resistance to deformation under load.
• Suitable for heavy-duty towing, equipment securing and industrial pulling applications (note: not for overhead lifting).

Proof Testing & Quality Assurance

• Each chain is proof tested during manufacturing: loaded to a specified tensile force applied gradually; chain must withstand the force without deformation.
• Additional evaluations include breaking force performance, dimensional accuracy and weld quality as quality benchmarks.

Typical Applications

• Transportation & Load Securement: truck cargo binding, trailer securing, equipment tie-down.
• Agriculture: farm machinery connection, manure handling systems, equipment towing.
• Forestry & Logging: log dragging, timber securing.
• General Industrial: material handling and utility chain applications.

Critical Safety Clarification

• Must NOT be used for overhead lifting.
• Must NOT replace alloy lifting chain (G80/G100).
• Must NEVER exceed the specified Working Load Limit (WLL).

Packaging (Full Drum)

• Full Drum configuration provides bulk packaging for industrial supply, reduced handling damage, efficient storage and transportation; suitable for distributors and large-scale users.

Standards & Compliance

• Primary standards: ASTM A391 (Carbon Steel Chain) and ASTM A413 (Welded Chain Requirements).
• Manufactured to NACM dimensional tolerances and grade classification system; meets or exceeds ASTM & NACM requirements. Proof tested and certified with clearly defined Working Load Limit and controlled welding/inspection processes.

Example Technical Data
Size (mm) | WLL (kg approx.) | Test Load (N) | Breaking Load (N)
6 mm | ~224 kg | 4500 N | 14000 N
8 mm | ~400 kg | 8000 N | 25000 N
10 mm | ~630 kg | 12500 N | 40000 N
13 mm | ~1000 kg | 21200 N | 63000 N

Additional Product Details

• Name: Grade 43 Chain Self Color – Full Drum
• MOQ: 100 Meters
• Package: Carton + Steel Pallet

Features / Technical Specifications

• Commercial name: Grade 43 Chain Self Color – Full Drum
• Brand: TOPONE CHAIN
• Material: Calibrated low carbon steel
• Finish: Self color (black mill finish)
• Manufacturing: Electronically welded (electrical resistance welding)
• Standards: ASTM A391, ASTM A413, NACM tolerances
• MOQ: 100 Meters
• Packaging: Full drum; carton + steel pallet
• Typical sizes and approx. WLL: 6 mm (~224 kg), 8 mm (~400 kg), 10 mm (~630 kg), 13 mm (~1000 kg)
• Intended uses: load securement, towing, timber/logging, agriculture equipment; not for overhead lifting