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7-wire steel strand tensile testing machine ISO 6934-4

7-wire steel strand tensile testing machine ISO 6934-4

Model: LW series, Computer control, 600KN, 1000KN

7-wire steel strand tensile testing machine can perform tension test for the steel strand, 7-wire strand for the reinforcement and prestressing of concrete, reinforcing bars, wire rod and wires. 
Conform with standard: ISO 15630-1, ISO 6934, ASTM A370, ASTM A416, GB/T 5224. 

Specialized features at the jaws clamping: 
A.    extra thick jaws seat to make the steel strand sample completely hold in the seat body during tension process, ensure the breaking position at the middle portion.
B.    High hardness (HRC68-70) lenthen jaws enhance the clamping length and area. To make the clamping more firm and reliable, no sliding during test.

General introduction

7-wire steel strand tensile testing machine can perform tension test for the steel strand, 7-wire strand for the reinforcement and prestressing of concrete, reinforcing bars, wire rod and wires. 
Conform with standard: ISO 15630-1, ISO 6934, ASTM A370, ASTM A416, GB/T 5224. 

Specialized features at the jaws clamping: 
A.    extra thick jaws seat to make the steel strand sample completely hold in the seat body during tension process, ensure the breaking position at the middle portion.
B.    High hardness (HRC68-70) lenthen jaws enhance the clamping length and area. To make the clamping more firm and reliable, no sliding during test.

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Widely used for industrial application, factory quality control, science and research institute, QC &QA college student training, education institute, testing and inspection center, laboratories, construction company, aerospace, mechanical production, electric appliance fields.  

Key Features

  • Main features
  • High-precision Servo Control
  • Stable & Powerful Loading Performance
  • Intelligent Data Management
  • Versatile & Adaptive Structure
  • Robust & Durable Design
  • Standard

1), Computer controlled hydraulic servo operate loading model, double working space, tensile test at upside of crosshead, compression and bending test between working bench and crosshead;
2), It adopts the hydraulic pressure to drive the cylinder, so loading on the specimen to perform the test. Hydraulic station supplies super and stable pressure to the system; the soundproof insulation can reduce the noise level of the power pack to 75 dB (A), with lower noise, tiny energy consuming and lower heat. 
3), Unique screw gap eliminating structure can guarantee the continuity of the test;
Total six columns structure, four column and two leading screw to make the machine more stable and life long working.   
4), Independent hydraulic clamping structure can guarantee the reliability of the system; it will not hurt person for falling specimen and ensure the safety of operator;
5), Limitation and electrical protection system can ensure the security of using;
6), The load frame adopts oil cylinder bottom type structure, hydraulic load, hydraulic clamping specimen;
7), Servo valve can control the speed arbitrarily through the software. It can carry out loading, unloading and oil quick feedback function (i.e. the cylinder come back to its original position after the test);
8), Crosshead (the middle beam) movement is by mean of motor, chain at the bottom of loadframe, driven leading screw to make crosshead up and down

Adopts closed-loop servo control technology, achieving precise regulation of loading rate (0.001mm/min to 500mm/min) and load holding (error ≤ ±0.5%);

Supports multi-mode control (load control, displacement control, strain control) and seamless switching between modes to meet diverse test requirements (e.g., creep test requires stable strain control, while tensile test needs load/displacement control).

Hydraulic drive provides ultra-high load capacity (up to 2,000kN or more), suitable for testing large-scale components (e.g., steel structures, concrete beams) and high-strength materials (e.g., aerospace alloys, industrial-grade steel);


Hydraulic system operates with low noise and minimal vibration, ensuring stable loading without impact, avoiding damage to samples and equipment.

Real-time display of test curves (force-displacement, force-strain, stress-strain) and automatic calculation of key mechanical parameters (yield strength, tensile strength, elongation, elastic modulus, etc.);


Data is stored in an unalterable format, supporting backup, export (Excel/PDF/Word), and traceability; some models integrate with Laboratory Information Management System for centralized data management.

Interchangeable fixtures (tensile, compression, bending, shear) enable multi-type tests on a single machine;


Adjustable test space (vertical/horizontal) adapts to samples of different sizes (from small metal sheets to large concrete blocks).

Host frame is made of high-strength alloy steel with anti-corrosion treatment, resistant to fatigue and deformation;


Hydraulic components adopt international brand parts (e.g., Moog servo valves) with low failure rate and long service life.

ISO 15630-1,Steel for the reinforcement and prestressing of concrete -- Test methods -- Part 1: Reinforcing bars, wire rod and wire
ISO 6934-4,Steel for the prestressing of concrete -- Part 4: Strand
ASTM A370,Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A416 / A416M,Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete.

Main technical specification

ModelLW-1000/LW-600
Max. load1000KN/600KN
Column Number4 column and 2 leading screw, total 6 columns
Measuring force range2%~100%
Accuracy of load±1% of indicated value
Accuracy of deformation ±0.5%, resolution: 0.01mm
Constant load, displacement, deformation control Range0.4%~100%FS
Deformation rate control accuracyRate<0.05%FS,accuracy ±2.0%     Rate≥0.05%FS, accuracy ±0.5%
Deformation measuringClip-on extensometer, standard gauge 200mm,   extension 100mm
Max. tensile space1000mm (can enlarge)
Steel strand clamping rangeφ9.2-φ12.7mm,φ12.7-φ15.24mm (other customized)
Compression platen dia.200*200mm
Piston stroke250mm
Max. piston speed100mm/min
Clamping modeHydraulic automatic
Dim. of frame960*650*2400mm
Dim. of control box1100×700×950mm
Weight3300kg


Main accessories (Standard delivery with machine)

High Stiffness Frame1 set
Controlled box (Oil cabinet)1 set
Oil Pressure sensor1 set
Hydraulic power system1 set
Photoelectric encoder for displacement1 set
Compression test fixture (Dia.160mm)1   set
Tool kit (screwdriver, spanner etc.,)1   set
Professional testing software(FastTest, English version)1   set
      Metal tensile testing method (ISO 6892);  
      Compression testing method (ASTM E9);
      Customize testing method function available.
Computer (HP or LENOVO computer, 19-inch LCD monitor, English Win10 system)1   set
Printer (HP A4 color inkjet printer)1   set
Documents (Manual, packing list, certificate)


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Beijing United Test Co., Ltd.