S-90377A152 0.344" ID x 0.75" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh environments and extending service life
• Enhanced load distribution with precise 0.344" ID and 0.75" OD, reducing surface stress and preventing fastener embedment
• Consistent mechanical performance ensured by Rockwell B68 hardness, providing reliable strength under pressure
• Broad compatibility with 5/16" screws in inch system applications, ensuring easy integration into existing assemblies
• Durable surface protection via black-oxide coating, which adds an extra layer against wear and environmental factors
• Strict quality assurance with controlled thickness (0.110-0.140"), delivering uniform performance and fit
• Global regulatory compliance including RoHS 3 and REACH, meeting international standards for safe, sustainable use

Professional Applications & Engineering Value

This 5/16" flat washer is engineered to address common industrial challenges such as corrosion, vibration loosening, and material fatigue. Constructed from Black-Oxide 18-8 Stainless Steel, it offers excellent resistance to rust and oxidation, making it suitable for outdoor, marine, and chemical processing equipment. The flat design and precise dimensions (0.344" ID, 0.75" OD) ensure even load distribution, which helps prevent joint failure and extends the lifespan of connected components. In applications like machinery assembly, automotive systems, and structural frameworks, this washer provides reliable performance under heavy loads and variable temperatures, reducing maintenance needs and downtime. Its inch system compatibility and robust build make it a go-to choice for engineers seeking durability and compliance in demanding environments.

Specification Summary & Compliance

This flat washer adheres to standard inch system dimensions with an inner diameter of 0.344", outer diameter of 0.75", and thickness ranging from 0.110" to 0.140", ensuring precise fit for 5/16" screw sizes. Manufactured from 18-8 stainless steel with a Rockwell B68 hardness, it meets general industry tolerances for flat washers. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial and commercial use.