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Metal Wire Reverse Torsion Tester

Metal Wire Reverse Torsion Tester

Model: NJS-10X, ISO 9649, ISO 7800

NJS-10X series Metal Wire Reverse Torsion Tester is used to execute metal wire torsion test, measure the metal wire endure of plastic distortion ability in single or double direction torsion condition; check the surface or internal defect. This test determining the ability of metallic wire of diameter dimension from 0,3 mm to 10,0 mm inclusive to undergo plastic deformation during reverse torsion. This test is used to detect surface defects, as well as to assess ductility. Conform with standard ISO 7800, ISO 9649, ASTM A938. 

General Introduction

NJS-10X series Metal Wire Reverse Torsion Tester is used to execute metal wire torsion test, measure the metal wire endure of plastic distortion ability in single or double direction torsion condition; check the surface or internal defect. This test determining the ability of metallic wire of diameter dimension from 0,3 mm to 10,0 mm inclusive to undergo plastic deformation during reverse torsion. This test is used to detect surface defects, as well as to assess ductility. Conform with standard ISO 7800, ISO 9649, ASTM A938. 

Key Features

  • Principle
  • Standard
  • Application

A test piece of wire is twisted a specified number of turns through 360° around its own axis in one direction, and then a specified number of turns through 360° in the opposite direction.

Metal Wire Reverse Torsion Tester


SymbolDesignationUnit
dDiameter of a round wiremm
LFree length between gripsmm
N1Number of turns in one   direction-
N2Number of turns in the opposite   direction-

Dependence of free length between the grips on nominal diameter of the wire

Nominal diameterd (mm)    Free length between grips L (mm) (nominal)

0.3 ≤ d < 1.0

1.0 ≤ d < 5.0

5.0 ≤ d ≤ 10

   200d

   100d (1)

   50d  (2)

(1) 50d may be used by special agreement.

(2) 30d may be used by special agreement.



ISO 7800 Metallic materials -- Wire -- Simple torsion test

ISO 9649 Metallic materials -- Wire -- Reverse torsion test. 

ASTM A938 Standard Test Method for Torsion Testing of Wire  

GB/T 239.1,  GB/T 239.2 Metallic materials -- Wire – torsion test. 

This Standard specifies a method for determining the ability of metallic wire of diameter dimension from 0,3 mm to 10,0 mm inclusive to undergo plastic deformation during reverse torsion. This test is used to detect surface defects, as well as to assess ductility.

Steel:  steel wire, steel rod, steel rebar;

Copper: copper wire, copper rod, copper alloy

Aluminum: Aluminum wire, aluminum rod, aluminum alloy;

Other metal: Rod, glass steel, alloy steel etc. 

Main Technical Specification

ModelNJS-10X
Specimen diameter range0.3-3mm ; 3-10mm
Rotate speed (for steel/aluminum)0.1~2 (Number of   turns per S)  /  1 ~ 120 Rpm
Rotate speed (for copper)  (optional with extra cost)0.1~5   (Number of turns per S)  /  1 ~ 300 Rpm
Moving guide rail parallelism<0.2mm
Distance between two jaws500mm
Chuck hardness55~65 HRC
Max. count circles999999
Turning directionBoth directions
Power220V, 50HZ, 1 phase
Dimensions1400×370×1100mm
Weight250Kg


Main Accessories

Mainframe1   set
Moving   guide rail1   set
Deceleration motor1   set
Safety cover1   set
Measuring system1   set
LCD display system1   set
Weight1   set
Chuck (0.3~3mm, 3-10mm)2   sets
Documents   (Manual, packing list, certificate)


Standard

ISO 7800 Metal Wire Torsion twisting testing – Wire Simple torsion test

ISO 7800 specify a unidirectional simple torsion test to evaluate the plastic deformation ability of metallic wire under torsional loading in one direction. It applies to round and shaped wire with diameter or characteristic dimension from 0.1 mm up to and including 14 mm.

ISO 9649 Metallic materials - Wire - Reverse torsion test

ISO 9649 Metallic materials - Wire - Reverse torsion test

This International Standard specifies a method for determining the ability of metallic wire of diameter dimension from 0,3 mm to 10,0 mm inclusive to undergo plastic deformation during reverse torsion. This test is used to detect surface defects, as well as to assess ductility.


A test piece of wire is twisted a specified number of turns through 360° around its own axis in one direction, and then a specified number of turns through 360° in the opposite direction.

ASTM A938 Test Method for Torsion Testing of Wire

ASTM A938 test methods covers torsion testing of wire. It provides knowledge of the ductility of a wire when under torsion loading. A torsional test machine with proper gripping solutions is necessary for the test practices of ASTM A938. It is a testing standard that describes the torsion (or twist) testing procedures of metallic wire. The results of torsion tests can be used to assess wire ductility under torsional loading.


The torsion testing machine should have chuck jaws that will remain coaxial during the test. One of the chucks should be easily displaceable in the direction of the wire axis. The wire should be twisted only along the test length, and not at the point of clamping. We recommend UnitedTest metal wire reverse torsion testing machine.

ISO 15630-3 Testing of Prestressing Steel Strands Relaxation, Fatigue, Tensile testing

ISO 15630-3 specifies uniform, repeatable test methods for prestressing steel products: bars, wires, and strands used in prestressed concrete structures. Mainly include tensile test, bend test, reverse bending test, wrapping test, Axial force fatigue test etc., 

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Beijing United Test Co., Ltd.