Standard Washers
4769 Products
General Purpose Washers
General-purpose washers are flat, circular components used to distribute the load of a fastener evenly, prevent damage to the surface being fastened, and ensure a secure connection in a variety of applications.
Metric General Purpose Washers
Metric general-purpose washers are flat, circular components designed to distribute the load of a fastener evenly and prevent surface damage in applications that use metric-sized fasteners. They provide a secure and stable connection across various mechanical and construction tasks.
Oversized Washers
Oversized washers have a larger diameter than standard washers, providing additional surface area to distribute the load of a fastener and offer greater stability and protection for the surface being fastened. They are commonly used in applications where extra support or coverage is needed.
Metric Oversized Washers
Metric oversized washers are larger than standard metric washers, designed to provide increased load distribution and surface protection for metric-sized fasteners in applications requiring additional support or coverage.
Mil. Spec. Washers
Mil. Spec. washers, or military specification washers, adhere to specific standards set by military regulations to ensure consistent performance, reliability, and quality. These washers are used in applications where adherence to rigorous standards is critical, such as in aerospace, defense, and high-stress environments.
SAE Washers
SAE washers, or Society of Automotive Engineers washers, conform to standards set by the SAE to ensure uniformity and performance in various applications. These washers are used in automotive and industrial settings to distribute load, prevent damage, and provide a secure connection with SAE-standard fasteners.
ASME Washers
ASME washers, or American Society of Mechanical Engineers washers, conform to standards set by ASME to ensure uniformity and reliability in mechanical and industrial applications. These washers are used to distribute load, prevent surface damage, and provide a secure connection in accordance with ASME specifications.
USS Washers
These washers are typically larger in outer diameter than SAE (Society of Automotive Engineers) washers and are used in construction and machinery applications, offering greater surface area to distribute load. They are commonly available in various materials such as steel, stainless steel, and zinc-plated versions.
Washers with Material Certification
Washers with material certification are critical in industries like aerospace, construction, automotive, and defense, where compliance with specific material standards and performance requirements is essential.
Washers for Structural Applications
Washers for structural applications are designed to withstand high loads and stresses, making them ideal for use in construction, bridges, buildings, and other load-bearing structures. These washers distribute the load of fasteners and provide stability, preventing loosening and reducing wear on the materials they secure.
Metric Washers for Structural Applications
Metric washers for structural applications are used in conjunction with metric bolts and fasteners in construction and other heavy-duty applications, especially in regions where the metric system is standard. These washers help distribute the load, prevent loosening, and ensure the longevity of the structure.
Tension-Indicating Washers for Structural Applications
Tension-indicating washers, often referred to as DTIs (Direct Tension Indicators), are used in structural applications to ensure proper tension is achieved in bolts during installation. These washers are commonly used in critical structural applications such as bridges, high-rise buildings, and other load-bearing structures where bolt tension is crucial for safety and performance.
Washers for Blind Rivets
Blind rivets are commonly used in applications where access is only available from one side of the workpiece. Washers help distribute the load and provide extra support, particularly when working with thin or soft materials like plastic, sheet metal, or wood.
Washer Blanks
Washer blanks are essentially flat, round discs with a central hole, often used as the base material for creating custom washers or other components. These blanks are typically made from various metals and other materials and can be drilled or finished to meet specific application requirements.
Plastic Washers
Plastic washers are lightweight, non-metallic components used in various industries due to their insulation properties, corrosion resistance, and flexibility. They are commonly used in applications where metal washers would be too heavy, prone to corrosion, or where electrical insulation is required.
Metric Plastic Washers
Metric plastic washers are commonly used in applications where lightweight, non-corrosive, and non-conductive properties are required. These washers are available in standard metric sizes and are used across various industries such as electronics, automotive, aerospace, plumbing, and marine applications.
Mil. Spec. Plastic Washers
Military Specification (Mil-Spec) plastic washers are high-quality washers that meet rigorous standards set by the U.S. Department of Defense or other military authorities. These washers are designed for use in military, aerospace, and defense applications, where durability, reliability, and strict adherence to performance criteria are critical.
Chemical-Resistant Plastic Washers
Chemical-resistant plastic washers are used in environments where exposure to corrosive chemicals, solvents, or extreme temperatures is a concern. These washers provide durability and longevity in harsh conditions, making them ideal for industries like chemical processing, pharmaceutical manufacturing, food and beverage, and marine applications.
Metric Chemical-Resistant Plastic Washers
Metric chemical-resistant plastic washers are ideal for environments requiring durability against aggressive chemicals, solvents, or corrosive substances. These washers come in various metric sizes and are used across industries like chemical processing, pharmaceutical manufacturing, and food and beverage production.
Mil. Spec. Chemical-Resistant Plastic Washers
Mil-Spec chemical-resistant plastic washers are engineered to meet the stringent requirements of military specifications, ensuring reliability in environments where exposure to chemicals, extreme temperatures, and harsh conditions are common. These washers are widely used in aerospace, defense, and other industries requiring superior durability and compliance with military standards.
Electrical-Insulating Plastic Washers
Electrical-insulating plastic washers are designed to prevent electrical conductivity between components, providing insulation in electrical and electronic assemblies. These washers are made from non-conductive materials and are used in various industries such as electronics, automotive, aerospace, and power distribution systems.
Metric Electrical-Insulating Plastic Washers
These washers are essential in applications where preventing electrical conductivity between components is necessary, such as in electronics, automotive, aerospace, and industrial systems.
Water- and Steam-Resistant Plastic Washers
Water- and steam-resistant plastic washers are designed to perform in environments exposed to moisture, water, and steam, where traditional plastic materials might degrade or lose their insulating properties. These washers are used in industries such as plumbing, food and beverage, chemical processing, and steam-based systems.
Metric Water- and Steam-Resistant Plastic Washers
Metric water- and steam-resistant plastic washers are designed for environments where moisture, water, or steam exposure is a concern, and where precise metric sizing is required. These washers are ideal for applications such as plumbing, food processing, chemical processing, and HVAC systems.
High-Temperature Plastic Washers
High-temperature plastic washers are designed to withstand extreme heat while maintaining their insulating properties, mechanical strength, and resistance to chemical degradation. These washers are essential in applications such as aerospace, automotive, industrial machinery, and high-temperature processing environments.
Metric High-Temperature Plastic Washers
These washers are often made from materials like PTFE (Teflon), PEEK, or other engineered plastics that provide thermal stability, chemical resistance, and electrical insulation. They are commonly used in applications such as automotive, aerospace, and industrial machinery, where both temperature resistance and durability are crucial.
Metric Extreme-Temperature Ceramic Washers
Made from materials like alumina, zirconia, or other technical ceramics, these washers are ideal for high-heat environments such as furnaces, turbines, and other industrial applications where metal washers may not suffice due to temperature limitations.
Extreme-Temperature Ceramic Washers
Made from advanced ceramics like alumina (Al2O3), zirconia (ZrO2), or silicon nitride (Si3N4), these washers excel in applications where conventional metal washers might fail due to heat, corrosion, or chemical exposure.
High-Temperature Mica Washers
High-Temperature Mica Washers are used in applications requiring both high heat resistance and electrical insulation. Mica, a naturally occurring mineral, has excellent dielectric properties and can withstand temperatures up to 1,000°C (1,832°F) or higher, depending on the grade.
Countersunk Washers
Countersunk Washers are designed to be used with countersunk screws, allowing the screw head to sit flush or slightly below the surface of the washer. These washers are typically used to distribute the load of the screw while providing a clean, flat finish on the surface of the material.
Metric Countersunk Washers
Metric Countersunk Washers are designed for use with metric countersunk screws, allowing for a flush, clean finish on a surface while distributing the load of the screw head over a wider area. These washers are ideal for applications that require both load distribution and a neat, finished appearance.
Plastic Countersunk Washers
Plastic Countersunk Washers are lightweight, non-conductive washers designed to be used with countersunk screws, offering a flush finish while distributing the load. They are made from various plastic materials, including nylon, PVC, or PTFE, each selected for specific performance characteristics.
Finishing Countersunk Washers
Finishing Countersunk Washers are specially designed to provide a smooth, polished look when used with countersunk screws. These washers ensure that the screw head sits flush or slightly below the surface, offering both a neat finish and added strength to the fastening system.
Metric Finishing Countersunk Washers
Metric Finishing Countersunk Washers are designed for use with metric countersunk screws, providing both a polished appearance and load distribution. These washers are ideal for applications where a clean, smooth finish is essential, and the fastener will be visible or exposed.
Electrical-Insulating Sleeve Washers
Electrical-Insulating Sleeve Washers are specialized washers designed to electrically insulate fasteners and prevent the conduction of electricity between components. These washers are often made from materials like nylon, phenolic, or other insulating plastics and are used to ensure that fasteners do not create electrical bridges in sensitive applications.
Electrical-Insulating Rolled-Collar Sleeve Washers
The rolled-collar feature extends along the fastener, offering additional insulation and helping to align components during assembly. These washers are typically made from insulating materials like nylon or phenolic and are used in applications where both electrical isolation and precise alignment are critical.
Electrical-Insulating Cup Sleeve Washers
The cup-shaped design encloses the head of the fastener, providing comprehensive insulation and preventing electrical contact. These washers are typically made from insulating materials like nylon, phenolic, or other plastics.
Square Washers
Square Washers are flat washers with a square shape, providing a larger surface area for load distribution compared to traditional round washers. They are often used in applications where more surface contact is needed to prevent loosening or damage to materials, such as in wood or softer substrates.
Square Washers for Blind Rivets
Square Washers for Blind Rivets are designed to provide a wider surface area for load distribution when used with blind rivets. These washers help ensure a secure and strong fastening, particularly in soft or brittle materials where a traditional round washer may not provide sufficient support.
Clipped Washers
Clipped Washers are specially designed washers with one side "clipped" or flat, allowing them to fit into tight or irregular spaces where a traditional round washer might not fit. The flat edge can also prevent the washer from rotating or shifting in certain applications.
Oversized Clipped Washers
Oversized Clipped Washers are washers that feature a larger overall surface area with one flat or clipped edge. The oversized design allows for greater load distribution, making them ideal for securing fasteners in applications where increased support and stability are necessary.
Double-Clipped Washers
Double-Clipped Washers are washers that have two opposing sides "clipped" or flattened. This design allows the washer to fit into even tighter spaces or between components where a round washer would not be suitable.
Self-Retaining Washers
These washers typically feature a design that allows them to "grip" or "snap" onto the shaft of the screw or bolt, preventing them from falling off during assembly. This makes them ideal for applications where the washer needs to stay in place during installation or handling.
Sleeve Washers for Soft Material
Sleeve Washers for Soft Material are designed to protect and distribute load over a wider area when fastening into softer materials like wood, plastic, or soft metals. The sleeve design helps prevent damage to the material by creating a barrier between the fastener and the surface, ensuring a more secure and long-lasting connection.
Cup Washers for Oversized Holes
Cup Washers for Oversized Holes are designed to provide a neat and secure fastening in situations where the hole is larger than the screw or bolt being used. The cup shape helps to center the fastener, distributing the load more effectively while preventing the fastener from pulling through the oversized hole.
Easy-Install Slotted Washers
The slot makes it possible to slide the washer onto a bolt or screw without fully removing the fastener, making them ideal for situations where fasteners are already in place or in hard-to-reach areas.
Angled-Edge Washers for Tie-Down Straps
Angled-Edge Washers for Tie-Down Straps are designed to distribute the load evenly and prevent the strap or fastener from cutting into the material during high-tension applications. The angled edges help guide and protect the tie-down straps, ensuring that they remain securely in place while reducing wear on both the washer and the strap.
Angled-Edge Washers for Toggle Clamp Holding Screws
Angled-Edge Washers for Toggle Clamp Holding Screws are designed to provide a secure fit and optimal load distribution when used with toggle clamps. The angled edge helps align the washer with the clamp’s holding screws, ensuring proper tension and preventing damage to the material being clamped.
Adhesive-Back Washers
Adhesive-Back Washers are designed with an adhesive layer on one side, allowing them to stick to surfaces for easier installation and alignment. This feature is particularly useful in applications where the washer needs to stay in place during assembly or in hard-to-reach areas where traditional washers may shift.
Oversized Washers for Wood
These washers are especially useful in softwoods or when fastening large or heavy objects to wooden structures, as they prevent fasteners from pulling through the material.
Plastic Washers for Rigid Insulation
Plastic Washers for Rigid Insulation are designed to be used in conjunction with fasteners to secure rigid insulation boards to surfaces such as walls, roofs, or floors. These washers are typically larger in diameter to provide enough surface area to hold the insulation in place without puncturing or damaging the material.
Washers for Electrical Terminals
Washers for Electrical Terminals are specifically designed to provide a secure and stable connection between electrical terminals and fasteners. These washers help ensure a reliable electrical connection by providing consistent contact, reducing the risk of loose connections, and preventing damage to the terminal or the fastener.
Curved Washers
Curved Washers, also known as wave washers or spring washers, are designed to provide a preload or absorb vibrations in applications where tension is needed between two components. Their curved or wavy shape allows them to compress and expand, helping to maintain tension in assemblies, even under varying loads or conditions.
Rectangular Washers
Rectangular Washers are flat washers with a rectangular shape, offering a larger surface area for load distribution than standard round washers. They are often used in applications where additional support is needed along one axis, or where space constraints make round washers unsuitable.
Washers for Cross-Bracing
Washers for Cross-Bracing are designed to provide extra stability and load distribution when fastening components in cross-bracing systems. These washers are typically larger and more robust to ensure the fasteners remain secure under high tension and varying loads, which are common in cross-bracing applications.
Flanged Washers for Cross-Bracing
Flanged Washers for Cross-Bracing are designed to provide additional support and load distribution for fasteners used in cross-bracing systems. The flanged design helps to increase the contact area between the fastener and the material, ensuring a more secure and stable connection, particularly in high-tension or load-bearing applications.
Magnetic Washers
Magnetic Washers are specialized washers that incorporate magnetic properties, allowing them to adhere to metal surfaces. These washers are typically made from ferromagnetic materials like steel or are embedded with magnets, making them ideal for applications where holding power and alignment are critical.
Washers for Square-Neck Bolts
Washers for Square-Neck Bolts are designed to complement square-neck bolts, typically used in applications where the bolt needs to prevent rotation while being tightened. These washers help distribute the load evenly, protect the material, and ensure the bolt remains securely fastened.
Standard washers are flat, disc-shaped components with a central hole, used to distribute the load of a fastener evenly across a surface, reduce friction, prevent surface damage, and improve the overall reliability of a bolted or riveted connection. As one of the most fundamental hardware components, washers play a critical role in nearly every mechanical assembly — from everyday fasteners to precision structural and aerospace applications.
Key Characteristics of Standard Washers
- Load Distribution — Spread the clamping force of a bolt or nut over a wider surface area, reducing the risk of surface damage, deformation, or pull-through.
- Surface Protection — Prevent scratching, marring, or wear on the mating surface caused by direct contact with a fastener head or nut.
- Vibration & Loosening Resistance — Certain washer types help maintain clamping force and resist loosening caused by vibration or thermal cycling.
- Gap Filling & Spacing — Compensate for slightly oversized holes or provide spacing between components in an assembly.
- Material & Standard Variety — Available in a wide range of materials (steel, stainless steel, plastic, alloy) and manufactured to recognized standards such as SAE, ASME, USS, ISO, DIN, and Mil-Spec to ensure consistent dimensions and performance.
- Size & Thickness Options — Offered in metric and imperial sizes, standard and oversized diameters, and various thicknesses to match different bolt sizes and load requirements.
Common Applications
Standard washers are used extensively across industries, including:
- General Fastening — everyday nut-and-bolt assemblies across machinery, equipment, and consumer products
- Construction & Structural Applications — bridges, buildings, and heavy-duty steel structures requiring reliable load distribution
- Automotive Manufacturing — assemblies requiring compliance with SAE or ASME standards
- Aerospace & Defense — applications requiring material certification and strict compliance with Mil-Spec standards
- Electrical & Electronics — insulating applications using plastic or non-conductive washers
- Piping & Pressure Systems — sealing and load distribution in flanged connections
- Heavy Machinery & Industrial Equipment — applications subject to high loads, vibration, or repeated stress
Surface Finishes & Coatings
Washers are often treated to enhance corrosion resistance or appearance, including:
- Zinc plating — cost-effective corrosion protection for general use
- Black oxide — mild corrosion resistance with a low-reflective finish
- Hot-dip galvanizing — heavy-duty corrosion protection for outdoor/structural use
- Passivation — enhances the natural corrosion resistance of stainless steel
Installation Considerations
- Always match washer bolt-hole size to the fastener diameter
- Use hardened washers under bolt heads/nuts in high-torque applications to prevent embedding
- Avoid mixing dissimilar metals (e.g., steel washer with aluminum surface) in corrosive environments to prevent galvanic corrosion
- For structural or tension-critical applications, follow specified torque values and washer orientation per engineering drawings
Whether you need a basic general-purpose washer or a washer manufactured to a specific industry standard, selecting the correct type, size, and material is essential to ensuring the long-term reliability and safety of your assembly.
LILY Bearing offers a comprehensive range of standard washers, including general-purpose, metric, oversized, structural, material-certified, and specialty washers, manufactured to meet SAE, ASME, USS, and Mil-Spec requirements — supporting applications from general industrial use to demanding structural and aerospace environments.
