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What inspections are required for fastener screws?

Update:22-01-2020
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Fastener screws need to be inspected before production […]

Fastener screws need to be inspected before production or after production to be officially put into use, so in order to obtain better results of fastener screws, be careful and careful when performing these inspections. The editor tells you some tests about fasteners and screws. We list the following points.

 1.Inspection of adhesion strength of fastener screws

There are many methods to evaluate the adhesion between the coating and the base metal, usually the following: 1. friction polishing test; 2. file method test; 3. scratch method; 4. bending test; 5. thermal shock test; 6. extrusion law.

2. Corrosion resistance inspection of fasteners and screws

The test methods for corrosion resistance of coatings are: atmospheric exposure test; neutral salt spray test (NSS test); acetate salt spray test (ASS test), copper accelerated acetate spray test (CASS test); and corrosion paste corrosion test (CORR test) and solution drip corrosion test; immersion test, immersion corrosion test, etc.

3. The inspection method of the fastener screw surface inspection

There are two types of surface inspection of fasteners. One is the inspection before the screws are not plated after the production of the screws, and the other is the inspection after the screws are plated. test.

4. Other inspection of fasteners and screws

After the fasteners are manufactured and before plating, we inspect the dimensions, tolerances and other aspects of the screws. See if it meets national standards or customer requirements. After the surface of the screw is treated, the screws we plated are inspected, mainly to check the color of the plating and whether there are any bad screws.

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