ISO 898 is a testing standard used to measure the mechanical and physical properties of steel fasteners at both ambient and non-ambient temperature. Steel fasteners are an extremely common component of many consumer goods and are also critical to the construction and aerospace industries. The standard classifies various bolts and screws as either ‘finished’ or ‘material’ and includes test methods specific to each of these classifications. ISO 898 references reputable metals standards such as ISO 6892 for performing these tests in a controlled and stringent manner.

Testing of steel components requires a high capacity universal testing machine such as Instron's 68FM-100 electromechanical floor model frames or servo-hydraulic industrial test frames such as Instron's HDX.

To match the specified dimensions of different fasteners, a wide variety of fastener holders and inserts are available for universal testing machines. Fastener testing accessories allow for the performance of proof tests, axial and wedge tensile tests, and cone stripping tests on most standard bolts, screws, studs, and nuts. Available accessories include a complete line of flat, wedge, and countersunk test washers, fastener holders, short bolt adapters, holder reducing assemblies, and nut-proof loading mandrels for proof, tensile, and head strength testing in accordance with ISO 898-1 and other fastener standards such as ASTM F606. These can be found on pages 27 - 38 of Instron's accessories catalog.

• Performing destructive testing to ISO 898 requires critical alignment of the fastener, and spherically seated connections can be used to ensure repeatable test results for these stringent requirements. Additionally, since most testing for ISO 898 is not performed with an extensometer, it is important that the test device has appropriate stiffness specifications for testing fasteners at high loads. 
• For more information, purchase the standard.