Washers for Loosening Fastening Schemes Commonly Used in Rail Transportation Industry
Anti-loose series-washers
1. French standard lock washer (NFE)
This product is a standard part of the French railway industry. It has a ribbed design and is suitable for the connection of 8.8 bolts. It has good anti-loosening performance and is suitable for general connection environments with low vibration.
2. Double wedge lock washer
The slope serration design of the double-layer toothed lock washer has a wedge locking function. Any loosening tendency of the bolt or nut will be prevented by the wedge effect of the sawtooth. The clamping force for the connection is very good, and the locking effect is excellent. The influence of temperature, humidity and lubrication is small, and it has certain reusability. At the same time, it can adapt to the connection of bolts up to 12.9. It is a product with a high usage rate in the rail transportation industry.
3. Corrugated elastic lock washer (SK series)
SK series washers are commonly used in the German railway industry and can be used with a variety of standard bolts. The dish-shaped washer structure with tooth pattern on the front can reduce the negative impact of dynamic load when it is in a vibrating environment. At the same time, the design of the tooth pattern can reduce the loss of pre-tightening force, thereby preventing the loosening of the connection and playing a very Good locking effect for safe and effective connection.
4. Conical ratchet elastic lock washers (S type vs. type)
This washer has a conical ring-shaped double-sided ratchet structure and a dish-shaped design. The load is evenly distributed to avoid bending and bolt deformation. The tooth-shaped design in the clockwise direction ensures vibration resistance and good sliding during assembly and tightening. It has been used in the rail transit industry for many years and has a good anti-loose effect. among them,
"S" type: Standard type, suitable for connection below 8.8 bolts
"VS" type: thickened type, suitable for class 8.8 and 10.9 bolt connections
5. Saddle elastic lock washers (with grid points)
Saddle lock washers have high tension and long spring deflection. This design can effectively prevent loosening and rotation, can be reused, and is not easy to produce widening and other deformations during tightening and loosening. It is often used in class 8.8. With 10.9 class bolts.
6. 3L / 4L elastic washer
This washer is made of several layers (3-6 layers) laminated. Compared with ordinary spring pads, the bearing pressure is more evenly distributed and the continuous tension of the assembly elements ensures the product has a good anti-loose effect. 8.8 and 10.9 bolt assembly.
In the rail transit railway industry, vehicles may be in a normalized vibration environment for a long time. In this case, the looseness and looseness of any component of the rail vehicle will endanger the safety of railway trains and passengers. Therefore, in the design phase of threaded fastening connection and product selection, engineers and technicians must do a good job of preventing loosening to ensure the safe and stable connection of fastener products. Therefore, in terms of protecting the safety of passengers and cargo, the products provided by NEWSTARWDH can provide you with reliable, high-quality and safe services, and escort the safety of train operations!
