The NFE 25-511 Standard Disc Convex Washer (Contact Lock Washer) is a washer with a tapered or beveled shape that is typically used in conjunction with bolts or screws to provide additional clamping force and prevent loosening. These washers typically have a raised textured surface to increase friction and prevent rotation.

Stainless Steel (304/316): Offers superior corrosion resistance and is suitable for moist or corrosive environments. The 316 grade has additional molybdenum, providing even better corrosion resistance, especially in marine applications.

Carbon Steel: Provides good strength and is the most common material for bolts. It may require additional surface treatments like galvanizing for increased corrosion resistance.

Alloy Steel: Offers enhanced strength and durability. It is often used in high-stress applications where high tensile strength is required.

Advantage:

Tapered Design: The tapered design of the NFE 25-511 washer helps to automatically adjust during fastening to accommodate different surfaces and provide even pressure distribution. Raised Texture: The raised texture on the surface of the washer increases friction with the connected part and helps prevent the washer from loosening in high vibration environments. Multiple Materials: These washers can be made from a variety of materials such as carbon steel, stainless steel (e.g. SUS 304, 316), etc. to accommodate different corrosion resistance and strength requirements. Surface treatment: The surface of the washers may be treated with zinc plating, Dacromet, blackening, etc. to improve corrosion and abrasion resistance.

Scope of Application

Machine building: In machine and equipment building, for fixing and adjusting machine parts such as bearings, gears and motors. Construction industry: In building and civil engineering, they are used to connect beams, columns and other structural components, providing a stable and reliable connection. Chemical industry: in the construction of chemical plants, these washers are used to connect and secure equipment such as pipes, pressure vessels and heat exchangers due to their good corrosion resistance. Automotive industry: In automotive manufacturing, they are used to connect automotive components such as chassis and body fixings.