---
code: "ISO 7500-1"
title: "Metallic materials — Verification of static uniaxial testing machines — Tension/compression testing machines"
institution: "ISO"
category: "material-testing"
revision: "2018"
scope: "Specifies static verification of the force-measuring system of tension and compression testing machines, including accuracy classes, test forces, and evaluation of relative error, repeatability, and reversibility over the verified range."
testMethod: "The machine is loaded in steps from a defined lower limit (often 1–2 % of capacity) to maximum force using traceable reference equipment; at each step ascending and descending runs are recorded with at least three series per point to compute error, repeatability, and hysteresis."
specimenRequirements: "Not applicable to material specimens; verification uses force transducers, proving rings, or dead-weight stacks per national metrology practice. Environmental conditions and machine warm-up shall be controlled during verification."
url: "https://vectorbtc.com.tr/resources/standards/iso-7500-1/"
---

ISO 7500-1 is the international benchmark for proving that a universal testing machine’s force channel is fit for purpose. Accuracy classes—commonly Class 0.5 (±0.5 % relative error) and Class 1 (±1.0 %)—let buyers match machine grade to aerospace R&D versus routine QC. The standard evaluates not only relative error but repeatability, resolution, and reversibility (hysteresis) on both increasing and decreasing load.

Verification typically spans from roughly 1–2 % of load-cell capacity to 100 %, with multiple cycles at each force step. The lowest force at which the machine still meets its class defines the **verified range start**—a key sales and calibration metric for 50 kN and 300 kN frames.

For North American contracts, [ASTM E4](/resources/standards/astm-e4/) pursues the same goal with a single ±1.0 % relative-error target and predominantly ascending-load checks. Compare geographic use, classification, error types, and load direction in the table on the ASTM E4 page.

Vector hydraulic and electromechanical UTMs are specified and documented against ISO 7500-1 Class requirements so laboratories can maintain traceable calibration certificates alongside material tests per [ISO 6892-1](/resources/standards/iso-6892-1/).