S-91083A031 0.406" ID x 0.812" OD ASME B18.21.1 SAE Washers

Key Features & Benefits at a Glance

• Uniform Load Distribution – The flat design with 0.812" OD and 0.406" ID spreads pressure evenly, preventing surface damage and extending assembly life.
• Precision Fit for 3/8" Screws – Accurate inner diameter ensures secure fastening without slippage, ideal for repetitive industrial use.
• Robust Steel Construction – Manufactured from durable steel for high tensile strength and resistance to deformation under stress.
• ASME B18.21.1 Compliance – Guarantees dimensional consistency and interchangeability, reducing installation errors and replacement costs.
• Environmental & Safety Compliance – Meets RoHS 3 and REACH standards, ensuring safe use in regulated industries and global supply chains.
• Versatile Thickness Range (0.051-0.080") – Accommodates slight variations in assembly gaps while maintaining reliable spacing and vibration resistance.
• Cost-Effective Reliability – SAE inch system standardization simplifies sourcing and inventory management for maintenance and production teams.

Professional Applications & Engineering Value

This SAE flat washer excels in demanding environments where vibration resistance and load distribution are critical. The steel material provides consistent performance in automotive assemblies, heavy machinery frames, and construction equipment, preventing bolt loosening and joint fatigue. Its 0.406" ID and 0.812" OD are precision-engineered to ASME B18.21.1, ensuring compatibility with 3/8" fasteners and reducing the risk of galvanic corrosion in mixed-material setups. By maintaining clamp force under dynamic loads, it addresses common failure points in industrial bolting applications, enhancing operational safety and reducing downtime.

Specification Summary & Compliance

This washer adheres to ASME B18.21.1 specifications for dimensional accuracy, including ID: 0.406", OD: 0.812", and thickness range: 0.051-0.080". It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, verifying the absence of restricted substances. The SAE inch system design ensures seamless integration with standard 3/8" screw sizes, providing reliable performance in regulated and general industrial applications.