How to Test Riveting Nut Mechanical Properties?(Ⅱ)

Taper experimental load

Taper experimental load is a kind of applied axial load that rivet nuts must withstand, and the nut thread should not be peeling or the inner wall doesn't allow to cracking in the process. In the test, nut is mounted on a taper washer with 120 ° angle that has been harden treated. The purpose of placing a conical washer is to produce a strong force to make the nut's inner wall expansion when it under the axial forces. If the nut fails in the test, usually due to the cracking of inner wall rather than the peeling of nut thread.

For high temperature environments - covered in ASTM A194 - the nuts all should be carried out to have the load test. In addition, the tolerance limit standard of continuous surface of the nut has defined that a seamed rivet nut should have the taper experimental load test. By testing it means that the seams on nut have not yet reached the degree of impacting on nut working.

The test is currently the best method in terms of identifying unqualified nut, and it will serve as a feasible requirement until the advent of better recognition technology. Read more...