A screw is a small cylindrical or conical threaded part of a metal rod with a sharp, nail-like end and a grooved or concave head, used alone. How to test screw quality
First of all, the screw detection should start from the wire of the screw. The quality of precision screws is directly related to the wire used to produce the screws. Good screw wire open screws are more beautiful. The head of the screw burst, the thread is not good. Good screw wire generally will not find this situation.

The second is the detection of the screw head forming, in the screw forming, the first production screw mold detection. A good mold can produce a good screw product. It is the machine detection of the production of screws, which is conducive to safe and smooth production. The appearance of the formed screws is tested to see if there are burrs, and the size and length of the formed screws are tested. See if these dimensions and lengths meet the national standard or the specific requirements of customers.

The next is the detection of screw rubbing. Screw rub teeth when the head of course is the tooth plate. The teeth that come out of the good teeth should be able to pass the stop rule. Pass the rules, stop the rules. There is also the detection of tooth thread pitch. It is also necessary to meet the national standard of screws or customer requirements.

Finally, color detection and salt spray test are carried out on the electroplated screws. Look at the color of the electroplated screws. How smooth is the surface of the screw? The salt spray test detects the rust time of the screw or how many hours of salt spray the screw will rust. After that, the screw shipment test. The method is to pick out the unqualified screws. Give the best quality screws to customers. Guarantee screw quality.

Screws are indispensable industrial necessities in daily life: such as tiny screws used in cameras, glasses, clocks, electronics, etc.; General screws for TV, electrical products, Musical Instruments, furniture, etc.; As for engineering, construction, and Bridges, large screws and nuts are used; Transportation equipment, aircraft, trams, cars, etc., are used with large and small screws. Screws have important tasks in industry, and as long as there is industry on Earth, the function of screws will always be important.