Examination at a measurement location on a screw. The order defines which tests will be performed.
Steel bolts and screws · Test planning · Standards
Bolt and screw testing to DIN EN ISO 898-1
Do you need bolt or screw testing to DIN EN ISO 898-1? First, we clarify which properties need to be tested. Testawell performs hardness testing on bolts and screws. Together, we agree what to measure, how to prepare the samples and which requirements to use when assessing the results.
Testawell performs hardness testing and is currently not accredited to DIN EN ISO/IEC 17025. If you need an accredited test report, arrange the testing separately with a laboratory accredited for the required method.
Which bolts and screws does the standard cover?
The standard describes mechanical and physical properties of bolts, screws and studs made of carbon steel or alloy steel with specified property classes. Whether it applies to your component depends on the material, thread and shape. Different requirements apply to set screws that are not under tensile loading. Scope published by ISO.
DIN Media lists DIN EN ISO 898-1:2013-05 as the current German edition. According to ISO, the international ISO 898-1:2013 was most recently confirmed in 2025. State the agreed edition in the order. Your drawing or customer requirements may specify a particular edition. German edition at DIN Media.
What role does hardness testing play?
Hardness is one of several properties used to assess a material. You can use it to investigate a batch, the condition after heat treatment or unusual features near the surface. Testawell offers Vickers and Rockwell testing. We measure hardness in the core, at the surface and as a profile across ground and polished sections. The right method depends on what you want to find out.
As a product standard, DIN EN ISO 898-1 sets requirements for the fastener. The test method standards describe how testing is performed: DIN EN ISO 6507-1 for Vickers and DIN EN ISO 6508-1 for Rockwell. The property class alone therefore does not tell you which tests to order.
Your test objective
Define in advance
Assess the hardness of a delivery batch
Required value or range, method, test force and sample selection
Compare the condition near the surface and in the core
Position of the section, measurement locations and conditions for comparison
Investigate a difference from a supplier report
Original measured values, test conditions and which samples the values belong to
Show that all applicable standard requirements are met
All requirements that apply to the component and the evidence needed to verify them
What information do we need for a quotation?
An order such as “test 10.9 bolts” leaves essential questions unanswered. Where possible, describe the decision you intend to make using the results. The following information helps us prepare a quotation:
Component: a drawing or photograph, fastener designation and material specification.
Traceability: manufacturer, delivery lot and separate identification of different batches.
Requirements: property class, standard edition and any additional customer requirements.
Test objective: incoming inspection, complaint investigation, process comparison or a specific hardness verification.
Samples: available quantity and whether the parts may be cut and prepared for a polished section if needed.
Report: the required assessment and any accreditation requirement.
What should the test report include?
Each measured value should clearly identify its sample: which bolt or screw was examined, at which location and under which conditions? This also applies when several batches are tested. To compare the findings with earlier results, you also need the hardness scale and test force used.
If the report is to state whether a part meets the requirements, agree those requirements and the rule for making that decision before testing. A hardness value alone does not tell you whether the part has passed. Alongside the measurement method, agree which requirements the results should be assessed against.
Why hardness alone cannot verify every standard requirement
A hardness value within the required range does not prove that a bolt or screw meets every requirement of DIN EN ISO 898-1. Depending on the fastener and the requirements, other properties must also be tested. The indentation method for assessing strength at individual measurement locations does not automatically replace prescribed tests either.
The standard also does not confirm that a bolt or screw is suitable for every use. For example, it does not cover fatigue resistance under repeated loading or the relationship between tightening torque and clamp force. These questions call for a separate testing order. Exclusions in the ISO scope.
Can I request only hardness testing to DIN EN ISO 898-1?
Yes. You can order hardness testing alone. We agree the samples, standard edition, method and requirements for assessment. The report then covers those agreed tests.
Does a hardness result within the required range prove the property class?
No. A hardness value within the required range confirms one property. It does not prove that the bolt or screw meets every requirement of the property class or the standard.
Which edition of the standard should I specify?
Specify the edition referenced in your drawing or purchase order. If none is specified, we agree the edition before testing.
Does Testawell offer accredited test reports?
Testawell is currently not accredited to DIN EN ISO/IEC 17025. For an accredited test report, you need a laboratory accredited for the required method.
How many bolts or screws should I send?
This depends on what is being tested, how many batches are involved, the required sampling plan and how the samples are prepared. Tell us how many parts are available. We will agree the number of samples needed before shipment.
Plan hardness testing to meet your standard requirements
Send us the fastener designation, property class and specified standard. Describe what you want to test. We will agree the appropriate hardness tests with you.
