XQV JLM Precision Rolling Screw Steel Connector – High-Strength Threaded Coupler for Prestressing

Precision-Rolled Thread Connector for Bar Splices – Reliable Load Transfer in Concrete Anchoring Systems

Product Introduction

The JLM precision rolling screw steel connector replaces traditional butt welding, offering simple connection and anchoring, safety and reliability, and convenient construction. It is mainly used to reliably connect two threaded steel bars, transmit force and torque, and ensure the stability and strength of the structure. Through the threaded steel connector, the axial butt joint of the steel bars can be realized, so that the two steel bars work together under force just like a complete continuous bar. This connector is an essential component in prestressed concrete structures requiring high-strength bar splicing.

Key Features & Advantages

🔗 Replaces Butt Welding: Eliminates on-site welding, simplifying construction and ensuring consistent quality.

⚙️ High-Strength Connection: Precision-rolled threads provide reliable load transfer and torque resistance.

🏗️ Wide Compatibility: Suitable for PSB500 to PSB1080 grade finish rolled rebars (18–36mm diameter).

📐 Axial Butt Joint: Ensures two bars work together as a continuous bar under tension.

📜 Compliant Standards: Manufactured to GB/T14370-2015, JT/T329-2010, TB/T3193, ISO, CE, ASTM, BS.

Technical Parameter

JLM Series Connector Structure Diagram:

[ Structure Diagram Placeholder ]

Type No.	Ad (mm)	L (mm)
JLM25	48	130
JLM32	55	160

Parts Specification

Component Name	Specification	Materials	Surface Treatment	PKG Method	Standard
Anchor Head	–	40Cr	Corrosion Protection	cardboard box or wooden case	GB/T14370-2015, JT/T329-2010, TB/T3193, ISO, CE, ASTM, BS…
Connector	–	40Cr
Bearing Plate	–	ZG270-500
Spiral Reinforcement	–	HRB400
Nut	–	40Cr

Prestressing Concrete Rebar (Finish Rolled Rebar)

Diameter (mm)	Length (m)	Yield Strength Grades
18, 20, 25, 32, 36	9, 12	PSB500, PSB785, PSB830, PSB930, PSB1080

The rebar for prestressing concrete is also called finish rolled rebar, a straight steel bar with large diameter, super-high strength and high dimensional precision, on which the outer screw with equal height rib is rolled. It mainly serves connection and anchoring. The profile and dimension comply with the stipulations of traffic authorities road planning and design institution for prestressing high-strength finish rolled rebar. Custom lengths, bundle quantities, and minus deviation weight delivery available upon request.

Application

XQV JLM Precision Rolling Screw Steel Connector is widely used in construction engineering, bridge construction, tunnel construction, water conservancy and hydropower projects and other fields. In these projects, threaded steel bars form the critical framework of concrete structures, and threaded steel connectors are key components ensuring bar splicing quality and structural safety. Typical applications include:

Construction Engineering: Used for vertical bar splicing in high-rise building columns, shear walls, and core tubes. The connector replaces traditional lap splicing or butt welding, saving material and simplifying construction.

Bridge Construction: Applied in pier column reinforcement splicing, prestressed concrete box girder longitudinal bars, and cable pylon anchor zones. Provides reliable mechanical connection under cyclic traffic loads.

Tunnel Construction: Used for rock bolt connections, primary lining grid bar splicing, and secondary lining reinforcement joints. The precision-rolled thread ensures fast installation in confined tunnel sections.

Water Conservancy & Hydropower Projects: Applied in dam foundation reinforcement, spillway pier bar connections, and lock chamber wall reinforcement. Resists high water pressure and seismic loads.

Precast Concrete Industry: Used for splicing precast column-to-foundation bars, beam-column connections, and segmental bridge element couplers. Standardized threads allow rapid assembly on site.

Foundation Pit Support & Ground Anchors: Provides bar extension for soil nailing walls, anchor rods, and strut excavation systems. Ensures continuous load transfer along the reinforced length.

Workshop

Our Manufacturing Base – Liuzhou Xuanqiao Prestressed Machinery Co., Ltd.

Located in Liuzhou, Guangxi – a key industrial hub for prestressed technology – our modern workshop covers over 10,000㎡. We operate CNC machining centers, automated assembly lines, and precision testing equipment to ensure consistent quality.

Every batch of raw material is inspected, and finished products (anchors, jacks, pumps, ducts) are tested in our in‑house laboratory for mechanical performance and pressure resistance. We are certified under ISO 9001:2015 and comply with FIP international standards.

Annual capacity: 6 million anchor holes and 1,000+ sets of hydraulic equipment. Our experienced technicians and engineers follow strict SOPs to guarantee reliability.

We maintain sufficient raw material inventory and finished goods for fast delivery. Continuous investment in equipment and training keeps us at the forefront of prestressed manufacturing – because a strong factory means reliable products and long‑term trust.