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ISO – 8987 Essai de torsion et couples minimaux de rupture diamktre nominal de filetage de 1 mm 9 10 mm Reference number IS0 The work of preparing International Standards is normally carried out through IS0 technical committees.

Each member body interested in a subject for which a technicai committee has been established has the right to be represented on that committee.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. IS0 consists of the following ical properties of fasteners: Bolts, screws and studs Part 2: Nuts with specilied proof load values – Coarse thread Part 5: Set screws and similar threaded fasteners not under tensile stresses Part 6: Nuts with specified proof load values – Fine pitch thread Part 7: Torsional test and minimum torques with nominal diameters 1 mm to 10 mm for bolts and screws only.


No part of this publication may be oso or by any means, electronic or mechanical, including photocopying permission in writing from the publisher.

Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to,10 mm 1 scope 3. The test applies to bolts and screws with thread less than M3 for which no breaking and proof loads are indicated In IS0as well as to short bolts and screws with nominal diameters 3 mm to 10 mm which cannot be subjected to a iao test.

The minimum breaking torques hexagon socket set screws. At the time of publication, the edition indicated was valid.

All standards are subject to revision, and parties to agreements based on this part of IS0 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. The test result shall not be influenced by head friction or by thread friction.

ISO – Wikipedia

Clamp the bolt or screw into the test device over at least two full threads, having a free thread length of at least one thread diameter present between the head of the bolt or screw and the threaded insert see figure I.


Apply the torque in a continuously increasing manner. Also since bolts and screws with threads greater than M3 LID to anproximately Ml0 often cannot be subjected to a tensile test or proof load test due to their short lengths, minimum, breaking torques have been specified for bolts and screws Ml to Ml0 ineluding the fine pitch threads M8 x 1: Ml0 x 1 and Ml0 x 1,25 which allow an evaluation of the functional properties of the bolts and screws.

For the note time being, minimum breaking torques can specified for property classes 8. Figure 1 is only an example of a suitable test device. The minimum breaking torques have been determined on the basis of cross-sections resulting from the minimum values of the minor diameter of the thread tolerance 6g. Tests have shown that the torques can also be used for bolts and screws with thread tolerances 6f and 6e.