GB/T 3159-2026 "Hydraulic Universal Testing Machine" Provisions Key Points and Implementation Guidelines
2026-09-01 09:00:001. Background of standard revision
Since GB/T 3159 was first released in 1982, it has been revised three times in 1992, 2008, and 2026.This revision was proposed by the China Machinery Industry Federation, under the jurisdiction of the National Testing Machine Standardization Technical Committee, and was completed by a number of key units in the domestic testing machine industry. It reflects the systematic requirements for the accuracy of testing equipment in the transformation of my country's manufacturing industry to high-quality development.
2. Main technical changes
1. Accuracy level adjustment: changed from three levels to two levels
The old standard divides testing machines into level 0.5, level 1, and level 2; the new standardOnly level 0.5 and level 1 are retained, delete level 2.This marks the gradual withdrawal of low-precision testing machines from the mainstream market, and the overall accuracy threshold of the industry has significantly increased.
Main technical indicators (based on GB/T 16825.1-2022, etc.):
Technical indicators | Level 0.5 | Level 1 |
|---|---|---|
Relative error of indication value | ±0.5% | ±1.0% |
Indication value repeatability | 0.5% | 1.0% |
Indication value forward and return difference | ±0.75% | ±1.5% |
Zero point relative error | ±0.25% | ±0.5% |
relative resolution | 0.25% | 0.5% |
2. Added new technical requirements for extensometer systems
The standard adds a new chapter 6.4 "Extensometer System", which requires the extensometer system to comply with JB/T 6146-2020 "Extensometer Technical Conditions", and clearly stipulates the relative error of gauge length, indication error, advance and return difference, and resolution.This change has enabled the testing machine standard to move from "force value single parameter" to "force value + deformation multi-parameter" comprehensive measurement, which is crucial for determining elastic modulus, specifying non-proportional extension strength and other parameters.
3. Added new technical requirements for displacement measurement system
A new chapter 6.5 is added, which requires that the resolution of the indicating device is not greater than 0.01mm, and the maximum allowable relative error of the displacement indication value is ±0.5%, providing a basis for testing parameters such as elongation at break and compression rate.
4. Clarify long-term stability indicators
New requirements for zero point drift of the force measuring system: within 15 minutes after warm-up, the level 0.5 shall not exceed 0.5% and the level 1 shall not exceed 1.0%; a new discrimination force threshold requirement shall be added (not greater than 0.25% of the lower limit of the force measurement range).Among them, the discrimination threshold of the 0.5-level testing machine can be determined by "400×resolution", and the level 1 test machine can be determined by "200×resolution".
5. Upgrade of inspection rules and detection methods
The passing rate of factory inspection must reach 100%, and the measured data of major items shall be recorded in the product certificate;
Level 0.5 testing machines should use standard force measuring instruments not lower than level 0.1, and level 1 testing machines should use standard force measuring instruments not lower than level 0.3, which should be traced to national benchmarks;
The coaxiality and noise detection methods of the afterburner system are all implemented in accordance with the new version requirements.
3. Main parameter series
The standard stipulates that the main parameter of the testing machine is the maximum test force. The series covers a total of 12 specifications from 50kN to 10,000kN, taking into account different application scenarios such as construction, metal materials, and large structural parts.
4. Implementation Suggestions
For manufacturing companies: Focus on improving the long-term stability and zero-point drift performance of the force measuring system; use extensometers and displacement measurements as standard configurations; improve the factory inspection capability (0.1-level standard force measuring instrument, coaxiality measuring instrument, extensometer calibrator); and simultaneously carry out personnel training.
To user units: When purchasing, write "in line with GB/T 3159-2026, accuracy level 0.5/level 1" into the technical agreement; accept according to the method in Chapter 7 of the new standard, focusing on zero-point drift, coaxiality, extensometer and displacement measurement; establish a periodic inspection system and improve equipment technical files.
5. Benchmarking capabilities of Shandong Huayan Intelligence
The hydraulic universal testing machine product line of Shandong Huayan Intelligent Equipment Group Co., Ltd. has been developed and manufactured according to the technical system of GB/T 3159-2026. It can provide users with services such as accuracy level selection, extensometer/displacement measurement configuration, acceptance inspection and periodic calibration support. Welcome to contact us for selection and technical consultation.
