The Various Washer Types from Knapp Fasteners

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Knapp Fasteners, Cambridge, ON

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Washers are small but essential components in any fastening system. They provide stability, protection, and durability to connections. Each type of washer has unique attributes for specific applications, making it crucial to choose the right washer for the job. Let’s dive into the different types of washers including beveled washers, cup washers, disc spring washers, flat washers, nyltite washers, sealing washers, shoulder washers, and wave washers.

Beveled Washers
Beveled washers are an angled washer that features a slanted surface designed for specific applications where a fastener is installed on an uneven or sloped surface. The angled design helps align the fastener and washer with the slope which creates a stable connection. Beveled washers are commonly used in structural applications when connecting components where alignment is crucial.

Cup Washers
Cup washers, also referred to as finishing washers, have a concave shape that allows them to fit neatly over a screw head which creates a clean, finished look. These washers are useful in protecting surfaces from damage caused by the fastener head, dispersing the load, and providing a stable seat for the screw. They are popular in decorative applications, furniture assembly, and cabinetry, where visual appeal and smooth connections are desired!

Disc Spring Washers
Disc spring washers are also called belleville washers. They’re designed to exert an axial force when compressed, helping maintain tension in a bolted connection. Their conical shape allows them to act as a spring which is useful in applications that involve vibration or thermal expansion. You will often find disc spring washers in automotive, aerospace, and heavy machinery industries where secure connections are important.

Flat Washers
Flat washers are perhaps the most common type and serve multiple purposes. They distribute the load of a fastener, protect surfaces from damage, and reduce friction between a fastener head and the installation surface. Flat washers are available in various materials and thicknesses; making them versatile for countless applications, from basic household fixes to heavy-duty industrial projects. Common types are SAE, USS, and fender washers.

Nyltite Washers
Nyltite washers are ideal for sealing applications because of their material. These washers provide insulation, vibration dampening, and resistance to wear, chemicals, and moisture. They are frequently used in electronics, automotive, and plumbing applications where a tight seal is required. They help protect sensitive components from dust, moisture, and contaminants.

Sealing Washers
Sealing washers are specifically designed to create an airtight seal around a fastener which prevents leaks and protects against environmental factors. These washers often feature a rubber layer bonded to a metal washer, allowing them to effectively seal against liquids, gases, and debris. Commonly used in plumbing, automotive, and hydraulic systems, sealing washers provide both stability and a secure seal.

Shoulder Washers
Shoulder washers have an extended collar around the inner hole. This shoulder provides electrical insulation, spacing, and alignment between fasteners and components. Made from non-conductive materials like nylon, shoulder washers are frequently used in electronic assemblies to prevent electrical contact, maintain alignment, and protect sensitive parts. They are indispensable in industries where precise spacing and electrical insulation are needed.

Wave Washers
Wave washers have a wavy shape that allows them to compress under load. This provides a flexible and consistent preload in assemblies. The wave pattern creates a cushioning effect, making them ideal for applications that experience vibration, thermal expansion, or slight movement. Wave washers are commonly used in automotive, aerospace, and electronics industries to maintain a stable connection without overtightening the fastener. These washers can come with varying amounts of waves in them from 2-8 waves. The number of waves is related to the load rating of the washer.

For those looking to learn more about lock washers and their applications, check out this blog post, as we’ve covered lock washers in a separate post. The right washer might seem like a small detail, but it’s an essential component that can make or break the effectiveness of your fastening solutions. Need help sourcing your washers? Contact our sales team at sales@knappfast.com.