Overall Description
| Name | Captive Washer Cap Screw |
| Size | M4.5*6 or customized |
| Product material | High quality of SS304, SS316, etc |
| Finished | Polished, clean, etc |
| Feature | Screw with captive washer |
| Head type | Pan head or OEM |
| Drive type | Phillips or OEM |
| Application | Room decoration, water conservancy projects, etc |
Captive Washer Cap Screw Details
Captive Washer Cap Screw Application
Captive Washer Cap Screw Production Flow
Partners
The interpretation of fastener surface treatment
We often hear that fasteners need to be surface treated and are better used. Why do fasteners require surface treatment? What are the types of fastener surface treatment? The purpose of fastener surface treatment is to improve fastening. The use of anti-corrosion materials to improve the performance of the use, etc., can be selected according to the requirements of different quality.
First, electro-galvanized
Electrogalvanizing is the most commonly used coating for commercial fasteners. It is cheaper and looks better. It can be black and green. However, its anti-corrosion performance is general, and its anti-corrosion performance is the lowest in the zinc plating (coating) layer. In the normal electro-galvanized neutral salt spray test, within 72 hours, special sealing agents are also used, making the neutral salt spray test more than 200 hours, but the price is expensive, which is 5 to 8 times that of general galvanizing.
Galvanized fasteners have poor torque-pretensioning and are not stable, and are generally not used for the connection of important parts. In order to improve the consistency of the torque-preload force, it is also possible to improve the torque-preloading consistency by applying post-plating lubricants.
Second, phosphating
Two kinds of fasteners commonly used phosphating, zinc phosphating and manganese phosphating. Zinc phosphate lubricating performance is better than manganese phosphating, manganese phosphating corrosion resistance, wear resistance galvanizing better. Its use temperature can reach 225 degrees Fahrenheit to 400 degrees (107~204 C).