Fasteners. Loading, Toughness and Hardness Tests

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Today, on our post we want to talk about the testing methods required by ISO 898-1 for connecting elements. In particular, today we want to focus on loading, toughness and hardness tests.

Loading test for screws and finished studs.

This type of test consists of two main actions:

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Toughness test of screw head.

The toughness test of screw head aims aims at controlling the adapter section integrity between screw head and smooth shanks (or thread). How? The test of toughness of the head aims to check the integrity of the section between the head and smooth shaft (or thread). How? Hammering the screw head of a solid block according to a certain angle.

Hardness tests.

This test determines the hardness of fasteners that

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Please note that between hardness and tensile strength cannot exist a direct relationship. The hardness values are not specified for a maximum theoretical resistance evaluation. Where can you determined hardness? You can determined it both:

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What is the hardness? And what are the techniques to measure it?

Notoriously, the hardness is permanent indentation resistance of a material by an element under a defined load. How can you measured it? To do this you have been developed several techniques that use different geometries and materials related to indenters. In fact, hardness depends both on geometry and load applied. It is possible, therefore, carry out different hardness tests as:

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