ISO 898- 2
The Applied Technical Services Family of Companies offers ISO 898-2 testing services that deliver clear, actionable results for fastener qualification. ISO 898-2 defines mechanical and physical property tests for carbon steel and alloy steel nuts. Our services include tensile strength, proof load, elongation, hardness, and thread engagement checks, helping engineers and quality teams verify that nuts meet required property classes and perform reliably in assembly.
When Is ISO 898- 2 Testing Required for Fastener Qualification?
Manufacturers and purchasers use ISO 898-2 testing to confirm that nuts meet specified mechanical property classes for safety-critical or performance-sensitive applications. Testing is required when qualifying new materials, changing heat treatment, altering thread form, or when procurement documents specify ISO 898-2 compliance. It also verifies conformity after production changes and supports failure analysis in cases of unexpected loosening or fracture.
About Our ISO 898- 2 Testing Services
Our ISO/IEC 17025:2017 accredited laboratory conducts mechanical testing on nuts across all property classes, including proof load, tensile tests, hardness measurements, and dimensional thread inspections. We also perform calibrated torque and thread engagement evaluations, and offer metallurgical examinations when material or heat-treatment concerns arise. Our technicians follow documented procedures, use calibrated instruments, and provide detailed test reports with raw data, statistical summaries, and pass/fail conclusions.
Key capabilities
- Mechanical tests: proof load; tensile strength; elongation
- Material and inspection: hardness testing; thread dimensional checks; metallography
Why choose our lab
- Fast turnaround, clear test reports, and expert support
- Accredited equipment, traceable calibration, and experienced staff
What Testing Requirements Apply to ISO 898- 2 Nut Property Classes?
ISO 898-2 assigns nuts to property classes that correspond with bolt classes to ensure joint performance. Testing requirements vary by class and include minimum proof load, minimum tensile strength, and hardness limits to prevent galling or brittle failure. Higher property classes indicate nuts designed to withstand greater loads and are used in fastener systems with higher strength requirements. Test plans must sample representative production lots and use standard test methods for each property. For many classes, the standard requires proof load testing on a defined sample size and hardness checks across the lot. For additional assurance, we offer statistical sampling, batch traceability, and supplemental metallurgical analysis.
Contact Us
To learn more about how we can help you design a test matrix that meets procurement and regulatory requirements, call +1 (888) 287-5227 or submit an online inquiry.
