Metal Washers

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1974 S Houston Ave, Humble, TX 77396

Welcome to Patriot Bolt and Fastener, a leading provider of high-quality metal washers for the Oil and Gas, Energy, and Aerospace industries. As an ISO 9001:2015 accredited manufacturer, we take pride in delivering products that consistently meet customer and regulatory requirements. 

Our extensive range of metal washers is designed to address the specific needs of engineers and purchasing managers who demand reliable and precise fastening solutions.

Explore our comprehensive guide on metal washers, where you’ll find detailed information on various types, materials, and applications tailored to the requirements of your industry.

Washers on demand

flat washers

Flat Washers

lock washers

Lock Washers

spring washers

Spring Washers


metal washer manufacturer

Types of Metal Washers

Flat Washers

Plain washers: Plain washers are the most common type of flat washers. They distribute the load evenly over a larger surface area, preventing damage to the fastened material and reducing the chance of the fastener loosening over time.

Fender washers: Fender washers have a larger outer diameter than standard plain washers. Their increased surface area provides greater load distribution, making them ideal for applications where the fastened material is softer or prone to damage.

USS and SAE washers: USS (United States Standard) and SAE (Society of Automotive Engineers) washers are flat washers with specific dimensions defined by their respective standards. USS washers have a larger outer diameter than SAE washers, while SAE washers have a smaller inner diameter and are thicker.

Lock Washers

Split lock washers: Split lock washers, also known as helical spring lock washers, have a split ring shape with a helical design. When tightened, they exert a radial force on the fastener, creating friction and reducing the likelihood of the fastener loosening due to vibration or other external forces.

Tooth lock washers: Tooth lock washers have teeth on their inner or outer diameter that bite into the fastened material, creating a mechanical lock. They are available in internal tooth, external tooth, and combination tooth varieties, with a choice depending on the specific application requirements.

Spring Washers

Belleville washers: Belleville washers, also known as conical spring washers, have a conical shape that flattens when compressed, providing a spring force to maintain tension in the fastener assembly. They are often used in applications with high load requirements and limited space.

Wave washers: Wave washers have a wavy design that provides axial flexibility and generates a preload force when compressed. They are commonly used in applications requiring slight axial movement, such as bearing preload, to compensate for tolerances and thermal expansion.

Common Materials Used in the Oil and Gas Industry

The world of metal washers reveals a range of materials designed for the oil and gas industry’s demanding requirements. These crucial components ensure safety and efficiency in extreme conditions. Let’s examine common metal washer materials for the oil and gas industry:

  • Carbon Steel: Offers strength and durability, often improved with protective coatings like zinc.
  • Stainless Steel (316 and 316L): Provides exceptional corrosion resistance, ideal for corrosive environments.
  • Inconel: A nickel-chromium alloy with excellent oxidation and corrosion resistance at high temperatures and pressures.
  • Monel: A nickel-copper alloy with good resistance to corrosive chemicals and saltwater exposure.
  • Hastelloy: A nickel-molybdenum alloy resistant to strong acids, suitable for chemical processing applications.

Selecting suitable material involves considering application requirements, regulatory standards, temperature limits, and pressure thresholds.

Key Considerations When Choosing Metal Washers

Understanding key factors influencing metal washer selection is essential for optimal performance and project success in the oil and gas industry. Consider the following when choosing metal washers:

  1. Size and dimensions: Determine inner diameter, outer diameter, and thickness for compatibility with corresponding components.
  2. Material properties: Evaluate corrosion resistance, strength, and hardness to ensure durability under various conditions.
  3. Washer type: Choose between flat, lock, or spring washers based on application requirements and load distribution needs.
  4. Industry standards and regulatory requirements: Ensure compliance with standards like ISO 9001:2015 for quality control and adherence to best practices.

Applications Of Metal Washers

Ever wondered about the crucial role metal washers play across industries? These small but mighty components are the foundation for numerous sector applications. Distributing load, reducing friction, and preventing leakage, metal washers are indispensable.

Here’s a snapshot of where these unsung heroes excel:

  • Oil and Gas Industry: Metal washers maintain joint integrity in piping systems and flange connections under high pressure and temperature.
  • Energy Industry: Power plants and renewable energy facilities rely on washers for dependable connections within their infrastructure.
  • Aerospace Industry: Aircraft fastening systems and satellite assemblies depend on metal washers for structural stability and vibration reduction.

Understanding that not all washers are equal is essential. Materials, shapes, and sizes cater to specific needs across diverse industries. For example, stainless steel is chosen for corrosion resistance, while copper or brass suits electrical conductivity.

Certain washer types, like Belleville or wave spring washers, offer unique advantages, such as maintaining tension or compensating for thermal expansion.

So, next time you encounter these seemingly trivial components, appreciate their critical role in keeping our world together!

Environmental Factors Affecting Metal Washers

Environmental factors can significantly impact the performance and lifespan of metal washers. Understanding these factors will help you choose the right materials and coatings to withstand various conditions:

  1. Temperature: Extreme temperatures can cause material expansion or contraction, affecting washer performance. Opt for materials with low thermal expansion coefficients and high-temperature resistance for applications exposed to temperature fluctuations.
  2. Humidity: High humidity levels can accelerate corrosion, especially in metal washers made of carbon steel. Choose corrosion-resistant materials like stainless steel or apply protective coatings to prevent rust and degradation.
  3. Chemical exposure: In applications where washers are exposed to chemicals, selecting materials that can resist chemical attack is crucial. Options like Hastelloy and Monel offer excellent resistance to corrosive chemicals.
  4. Saltwater environments: For applications in marine or coastal settings, use materials with high resistance to saltwater corrosion, such as stainless steel or specialized coatings that protect against salt-induced degradation.

Considering these environmental factors, you can ensure the longevity and reliability of metal washers in various applications.

Importance Of Matching Metal Washers With Bolts

Exploring metal washer applications in industries like oil and gas, energy, and aerospace highlights their crucial role in maintaining reliability and safety in various systems.

Considering their importance, careful selection and pairing with corresponding bolts are essential.

Key aspects include:

  1. Material compatibility: Ensure similar corrosion resistance properties for washers and bolts to prevent premature failure due to corrosion or galvanic reactions.
  2. Load distribution: Match washer and bolt dimensions for optimal clamping force.
  3. Compliance with industry standards: Adhere to ISO or ASTM standards for bolts and washers, maintaining quality and consistency across applications.

By addressing these factors, engineers can ensure the reliability and longevity of washer-bolt assemblies in critical industries.


Are there any industry-specific standards or certifications for metal washers?

Various industries, including aerospace, automotive, and construction, have specific standards and certifications for metal washers to ensure quality, performance, and safety.

Some notable fastener standards are:

  • ASTM: American Society for Testing and Materials
  • ASME: American Society of Mechanical Engineers
  • PCC-1: Post Construction Committee 1 (Officially titled “Guidelines for Pressure Boundary Bolted Flange Joint Assembly)
  • SAE: Society of Automotive Engineers
  • ISO: International Organization for Standardization

The required standard depends on the application and industry. For example, aerospace applications often demand strict adherence to:

  • NAS: National Aerospace Standards
  • MS: Military Standards

Selecting washers that meet the relevant specifications guarantees their suitability for the intended purpose, ensuring reliability and safety across various applications.

How to determine the appropriate metal washer thickness for a specific application?

To select the optimal metal washer thickness for your specific application, consider these key factors:

  1. Load-bearing capacity: Assess the required strength and support for the assembly.
  2. Environmental conditions: Evaluate exposure to harsh conditions or extreme temperatures.
  3. Material compatibility: Ensure the washer material aligns with your project’s requirements.
  4. Industry standards: Adhere to any applicable industry-specific standards or certifications.

Remember, a thicker washer may increase durability but add weight and bulk. Carefully balancing these factors will guide you in selecting the ideal washer thickness for your project.

What are the risks of poor-quality metal washers in the oil and gas industry?

The oil and gas industry relies heavily on durable, high-quality metal washers to maintain the integrity and safety of various equipment and systems. Utilizing poor-quality or improperly matched washers in this critical industry can lead to significant risks:

  1. Leakage and environmental hazards: Inadequate sealing due to subpar washers may result in leaks, posing a risk to the environment and workers in the vicinity. This can lead to regulatory penalties and damage to a company’s reputation.
  2. Corrosion and premature failure: Washers that lack sufficient corrosion resistance may degrade quickly in the harsh conditions expected in the oil and gas industry, leading to equipment failure and unexpected downtime.
  3. Increased maintenance costs: Low-quality washers may require frequent replacement and maintenance, increasing operational costs and reducing overall efficiency.
  4. Compromised safety: In high-pressure, high-temperature applications, a weak washer can fail, resulting in catastrophic consequences such as explosions or fires, putting personnel at risk and causing substantial property damage.
  5. Non-compliance with industry standards: Adherence to stringent industry standards and regulatory requirements can lead to fines, legal repercussions, and lost business opportunities.

To minimize these risks, sourcing high-quality, industry-compliant metal washers explicitly designed for the oil and gas sector is crucial, ensuring optimal performance, reliability, and safety.

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Patriot Bolt and Fastener is your trusted partner for your metal fastener needs. As an ISO 9001:2015 accredited company committed to quality, we provide a wide range of specialty bolts and fasteners for the energy industry. 

Contact us today for any questions or quotes, and let our professional team assist you in finding the perfect metal fasteners for your projects.