Information on the most widely used ASTM standards within the materials testing industry
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.
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.
Key Features
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.

| Symbol | Designation | Unit |
| d | Diameter of a round wire | mm |
| L | Free length between grips | mm |
| N1 | Number of turns in one direction | - |
| N2 | Number 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
| Model | NJS-10X |
| Specimen diameter range | 0.3-3mm ; 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 jaws | 500mm |
| Chuck hardness | 55~65 HRC |
| Max. count circles | 999999 |
| Turning direction | Both directions |
| Power | 220V, 50HZ, 1 phase |
| Dimensions | 1400×370×1100mm |
| Weight | 250Kg |
Main Accessories
| Mainframe | 1 set |
| Moving guide rail | 1 set |
| Deceleration motor | 1 set |
| Safety cover | 1 set |
| Measuring system | 1 set |
| LCD display system | 1 set |
| Weight | 1 set |
| Chuck (0.3~3mm, 3-10mm) | 2 sets |
| Documents (Manual, packing list, certificate) | |
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