English
Cold Extrusion Couplers are widely used in reinforced concrete structures to achieve fast, safe, and reliable mechanical splicing without threading. According to the Chinese industry standard JG/T 163–2013, cold-extruded couplers must meet strict mechanical performance requirements, ensuring consistent and high-strength connections for major construction projects.
1. Mechanical Properties Required by the Standard
The material used for cold-extruded couplers must meet the following mechanical property indicators:
| Property | Requirement |
|---|---|
| Yield Strength (MPa) | 205–350 MPa |
| Tensile Strength (MPa) | 335–500 MPa |
| Elongation (%) | ≥20% |
| Hardness (HRBW) | 50–80 |
These performance benchmarks ensure that the coupler maintains ductility, toughness, and stable mechanical behavior under extrusion forces and long-term structural loads.
2. Appearance Quality Requirements
The standard also provides detailed requirements for appearance and workmanship to ensure consistency and reliability:
Coupler Sleeve Requirements
The surface must be smooth, free of cracks, folds, or defects.
No rust, oil contamination, or other impurities.
Ends must be cut square and free of severe deformation.
Markings must be clear, including batch, size, and manufacturer code.
These requirements ensure that the sleeve can deform uniformly during extrusion, resulting in a stable mechanical lock.
3. Structural Advantages of Cold-Extruded Couplers
1) No Threading Required
Cold-extruded connections eliminate the need for threading, simplifying installation and reducing equipment investment. This makes it ideal for congested reinforcement areas and job sites with tight timelines.
2) High Connection Strength
The extrusion process generates strong radial compression, enabling the coupler to grip the rebar firmly. Properly executed connections can reach the full tensile capacity of the reinforcement bar.
3) Reliable in Harsh Conditions
Cold extrusion is unaffected by rebar end shape irregularities, making it suitable for:
Short anchorage zones
Prefabricated construction
Seismic applications
4) Fast Installation
Workers can learn the extrusion process quickly, enabling efficient on-site construction and reducing labor costs.
4. Why GLUS Cold-Extruded Couplers Stand Out
GLUS manufactures cold-extruded couplers with strict quality control aligned with JG/T 163–2013 standards. Our advantages include:
Certified raw materials meeting all mechanical property indicators
Precision machining to ensure uniform extrusion deformation
Global supply capability with OEM services
Complete tool and hydraulic pump systems for extrusion operations
GLUS cold-extruded couplers provide a safe, cost-effective, and durable solution for high-rise buildings, bridges, tunnels, energy facilities, and seismic reinforcement.
