ISO 898-1 defines mechanical and physical property requirements for externally threaded fasteners (bolts, screws, and studs) made from carbon steel and alloy steel, organized by property class.
If you need help determining whether ISO 898-1 applies to your fastener type, size range, or verification plan, contact our team and we’ll help you align the standard with a practical lab workflow.
ISO 898-1: Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1
ISO 898-1 is used widely by manufacturers and users of threaded fasteners to define strength/property classes and the associated mechanical requirements for bolts, screws, and studs with ISO metric threads.
This document is primarily a product/specification standard that drives how fasteners are classified and what verification testing is used to demonstrate compliance to the cited property class.
Quick definition
What it is: An ISO International Standard specifying mechanical and physical property requirements for carbon-steel and alloy-steel bolts, screws, and studs (externally threaded fasteners) by property class.
What it is not: A complete performance standard for every fastener risk (for example, it does not set requirements for corrosion resistance, weldability, fatigue resistance, or torque/clamp-force performance).
What this standard covers
ISO 898-1 covers externally threaded fasteners intended to be evaluated at typical room/ambient conditions. It applies to carbon-steel and alloy-steel bolts, screws, and studs with triangular ISO metric screw threads and defined coarse and fine pitch ranges.
The standard also notes that some head geometries can prevent certain fasteners from meeting tensile or torsional requirements due to reduced shear area (for example, low-head or countersunk-head designs). Where head geometry or product design is unusual, the applicability and the correct verification approach should be reviewed carefully.
Why this standard matters in testing
ISO 898-1 is frequently cited on drawings, purchase specifications, and supplier quality documents to define the minimum mechanical capability of fasteners through their property class designation.
For QA/QC teams, it is a common reference point for incoming inspection, supplier qualification, and ongoing conformance testing—especially when fasteners are safety-critical or when consistent clamp load and joint integrity are required.
Common materials, product types, or applications covered
Common product types: ISO metric bolts, screws, and studs made from carbon steel or alloy steel, supplied to a specified property class.
Common applications: General industrial assemblies and engineered joints where externally threaded fastener strength class must be controlled (manufacturing, machinery, automotive supply chains, industrial equipment, and other applications using ISO metric fasteners).
Important boundary: ISO 898-1 does not apply to set screws and similar threaded fasteners that are not under tensile stress (those are addressed elsewhere in the ISO 898 series).
Common test or verification workflow
ISO 898-1 is typically used as the requirement document that drives a verification plan for the specified property class. In practice, labs and manufacturers use it to decide which mechanical checks are needed and how results should be compared to the required thresholds for the cited fastener class.
Common workflow steps: Confirm fastener designation and property class on documentation, select representative samples, run mechanical verification tests appropriate to the standard and product type, and report results against the acceptance requirements for that class (including clear traceability to the cited edition of ISO 898-1).
Equipment commonly used for this standard
Because ISO 898-1 is a requirements standard for fastener properties, equipment selection is driven by the verification tests needed for the specific property class and fastener design.
Common equipment families: Universal testing machines (UTMs) with suitable threaded-fastener fixtures/adapters for axial loading, torsion testing equipment or torsion-capable systems where torsional verification is required, and hardness testing systems commonly used for metallic fasteners (with supporting sample preparation tools when needed).
Practical selection note: The correct fixturing and capacity depend heavily on fastener size range, strength class, and whether the verification plan includes axial loading, torsion-related checks, or both.
How to read this designation or revision
Designation format: “ISO 898-1” identifies Part 1 of the ISO 898 series (externally threaded fasteners). The year suffix (for example, “ISO 898-1:2013”) indicates the published edition being cited.
Revision sensitivity: Test requirements, exclusions, and reporting expectations can be edition-dependent. When quoting equipment or setting up a compliance program, align your procedure to the exact edition referenced in your contract, drawing, or customer requirement.
Related standards, methods, or frameworks
ISO 898-1 is commonly used alongside other fastener standards depending on the product being controlled and the risk being addressed. Examples referenced in the ISO 898-1 abstract include guidance toward ISO 898-5 for set screws (where ISO 898-1 is not applicable) and ISO 16047 for torque/clamp force performance testing (which is outside the scope of ISO 898-1 requirements).
For internally threaded fasteners (nuts), other parts of the ISO 898 series are typically used rather than Part 1.
Talk with us about ISO 898-1 test equipment and setup
If you are equipping a lab (or upgrading fixtures) for fastener verification tied to ISO 898-1 property classes, you can request a detailed quote for a UTM/fixture package matched to your fastener sizes and the checks you need to run.