Fastener screws either before or after production need some inspection to be formally put into use, so in order to better use fastener screws, in these inspections must be careful, the following is to introduce some inspection points about fastener screws.
Checking Fastening Screws
Fastener screw coating adhesion strength test
There are many ways to evaluate the adhesion of a coating to a base metal, usually including the following:
Friction polishing test;
File method test;
Scratch method;
Bending test;
Thermal shock test;
The method of squeezing.
Test for corrosion resistance of coatings on fasteners and screws
Corrosion resistant coating test methods are: atmospheric explosion test; Neutral salt spray test (NSS test); Acetate spray test (ASS test), copper accelerated acetate spray test (CASS test); As well as corrosion paste corrosion test (CORR test) and solution drop corrosion test; Leaching test, interleaching corrosion test, etc.
Fastener screw surface inspection method
The surface inspection of fastener screws is divided into two kinds, one is the inspection before plating after the production of screws, and the other is the inspection after plating of screws, that is, the inspection after the hardening of screws and the inspection after the surface treatment of screws.
Other inspection of fasteners and screws
Hebei Dashan Fasteners Co.,Ltd is manfactor for Fastener screws. After the production of fastener screws, we will check the dimensions, tolerances and other aspects of the screws before plating. To see if it meets national standards or customer requirements. After the surface treatment of the screws, we have checked the plated screws, mainly to check the color of the plating, whether there are bad screws, etc. Before packing, the screws should be tested for dentition, strength, toughness, etc.
All ex-factory products have been tested in a full range to ensure the use of customers, but also to ensure our reputation.
Post time: Jun-03-2019