ISO 7500-1 — Calibration & verification of static uniaxial testing machines (force measurement)
ISO 7500-1 sets out how to verify and classify the force-measuring system of a uniaxial testing machine used in tension or compression. The verification result places the machine in an accuracy class, which then governs the tests it may be used for. To plan a verification interval or class target for your load frame, talk with our team.
What ISO 7500-1 Covers
The standard checks how accurately a machine applies and indicates force across its working range. A calibrated force-proving instrument is loaded on the machine, and the difference between the reference force and the machine reading determines accuracy, repeatability, and resolution at each test point.
Why It Matters
Tensile methods reference a required machine class. For example, room-temperature metal tensile testing to ISO 6892-1 expects a force system verified to a stated class, so a valid ISO 7500-1 certificate is what makes those results defensible. The verified class defines the force range over which the machine may be used for accredited work.
Reading the Designation
Cited as ISO 7500-1:YYYY. Confirm the edition, since class definitions and verification details can change between revisions.
Machine Accuracy Classes
Verification assigns the force range to a class based on the permitted relative error. Lower class numbers mean tighter tolerances:
| Class | Maximum permitted relative error |
|---|---|
| Class 0.5 | ±0.5% |
| Class 1 | ±1% |
| Class 2 | ±2% |
| Class 3 | ±3% |
How Verification Is Performed
Verification uses a force-proving instrument traceable to national standards, applied at graduated points through the range in both increasing and, where required, decreasing steps. The instrument itself is calibrated to ISO 376. Results are recorded per force point and summarized as the class the machine meets.
TensileMill CNC products for ISO 7500-1
Our specimen-preparation systems and testing equipment compatible with ISO 7500-1.
Electro Mechanical Universal Testing System 5 kN / 50 kN with Precision Load Cell
Electro-Mechanical UTM · 5 kN / 50 kN with Precision Load Cell
Electro Mechanical Universal Testing System 50kN / 1000kN with Precision Load Cell
Electro-Mechanical UTM · 50 kN / 1000 kN with Precision Load Cell
Servo-Hydraulic Universal Testing Machine (300 kN – 3000 kN)
Servo-Hydraulic UTM · 300 kN – 3000 kN
Precision Alignment Device (NADCAP-Ready Precision Fixture)
NADCAP-Ready Precision Alignment Fixture
Set up ISO 7500-1 testing with TensileMill CNC
Tell us your materials, specimen forms, and required test sections, and our team will match the right configuration.