according to test requirements such as BS Pt. 2 or ISO This can be expressed in two ways, the Coefficient of Friction µ and the Torque Coefficient (K . ISO FASTENERS – TORQUE/CLAMP FORCE TESTING. DIN EN ISO Fasteners – Torque/clamp force testing (ISO + Amd ) (includes Amendment).

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Surfaces often have a major influence on this. Every day, thousands upon thousands of screws and bolts are used to fasten components together. On some test benches the partial torque is measured in the thread, in others on the base.

This standard is not included in any packages. These include the geometry of the screw and the friction between fastener and components. As a result, the coefficients of friction calculated from torque and clamp force only really apply to the conditions on the test bench. These bases may be of low or high hardness, uncoated or galvanised. Cross-cut test for adhesion. Galvanised reference parts do not rust in storage. Not only can FEA show where new parts may have potential issues, it can be used to diagnose failures seen in the field, and also to optimize designs in order to reduce cost.

FEA can give virtual insight into the structural integrity of new designs before any capital is spent building parts. The respective complementary partial torque can be identified via subtraction. Please first log in with a verified email before subscribing to alerts.

Eddy current method phase sensitive. This is not always easy.


The option of choosing between uncoated and galvanised bases reflects the prevailing procedures in the American and European areas. The bolt heads lie on a reference base plate or a reference washer. This technique has a distinct advantage because the actual joint and fastener can be tested without compromising the joint stiffness through the introduction of a load cell. If they are fastened too tightly, components and the fasteners themselves may be damaged. Uncoated reference parts are oiled to protect against corrosion and later cleaned again.

ISO – Fasteners — Torque/clamp force testing

If fasteners are lubricated, friction is reduced — this applies both with regard to both external lubrication via grease or wax and integrated lubrication via the addition of a lubricant to the coating.

However, galvanised reference parts have their own coefficient of friction. The ISO standard enables different reference base plates or reference washers to be used. Coat thickness and coat thickness measurement. There are many types of engineering simulation and analyses that Matrix Engineering Consultants performs either as a stand-alone service or integrated into our projects.

You may delete a document from your Alert Profile at any time. Standards Subsctiption may be the perfect solution. In practice, there are two ways in which companies deal with this: Username or email address: Such data can be used to establish the appropriate torque-angle requirement for the specific fastener and joint.

From a standardisation viewpoint, this dilemma is unresolved. If the factor is very high, fasteners need to be tightened with a high torque and the efficiency of the fasteners decreases. MEC can be perform tests on actual fastened assemblies to obtain torque-angle graphs and to establish the torque to reach the yield strength of the bolt. In this process the fasteners are screwed to their own washer.

However, if the fastener and with it the washer is coated with a lubricant, the lubricated base of the fastener is tightened against the lubricated washer on the test bench. When fastening, the torque must be correct in order to achieve the required clamp force — the force that a fastener uses to hold two components together. Please first verify your email before subscribing to alerts.



Webprint Printed and bound. The variety around the topic of corrosion and corrosion protection is also in our glossary at home: The relationship between input torque and induced tension in a specific fastener application can be determined by testing the fastener with a calibrated load cell and torque device.

As the voice of the U. A bolt that requires kso is screwed into the test bench and fixed with a reference bolt.

For example, brighteners in the galvanised coat serve to lower the friction between reference part and fastener. Have fun clicking through! Coefficients of friction calculated according to ISO standard need to be regarded with caution, however. By repeating the test on a sample of the fasteners, the variation in the torque-tension relationship, can be established for an application.

Already Subscribed to this document. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.

In order to achieve the isl clamp force with a specified torque, the tightening instructions must assume a total coefficient of friction of the fasteners. This standard also specifies how these coefficient of friction levels can be calculated. Technical terms can not always be avoided.