S-90377A177 0.5" ID x 1.25" OD Oversized Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from black-oxide coated 18-8 stainless steel, ideal for harsh or humid environments.
• Optimal load distribution with a 1.25" outer diameter, preventing surface damage and fastener loosening.
• Precise fit for 7/16" screws ensured by the 0.5" inner diameter, reducing installation errors.
• Durable construction with a 0.110-0.140" thickness range providing reliable performance under pressure.
• Full compliance with RoHS 3 and REACH regulations, meeting strict environmental and safety standards for industrial use.
• Broad industrial compatibility due to inch sizing and robust stainless steel material.
• Enhanced longevity from the combination of stainless steel base and protective black-oxide finish.

Professional Applications & Engineering Value

This black-oxide 18-8 stainless steel flat washer is engineered to address common industrial challenges such as corrosion, vibration-induced failure, and regulatory non-compliance. The black-oxide surface treatment significantly boosts the innate corrosion resistance of 18-8 stainless steel, making these flat washers suitable for outdoor, marine, chemical processing, and food industry applications where moisture and corrosive agents are prevalent. With an OD of 1.25" and ID of 0.5", it ensures even load distribution for 7/16" screws, protecting assembled surfaces from indentation and maintaining clamp load integrity. This reduces maintenance frequency and equipment downtime, offering a reliable, long-term fastening solution for engineers and procurement specialists seeking durable, regulation-compliant components.

Specification Summary & Compliance

This washer features an inner diameter of 0.5", outer diameter of 1.25", and thickness between 0.110" and 0.140", designed for use with 7/16" screws in inch-based systems. Manufactured from 18-8 stainless steel with a black-oxide finish, it adheres to industry standards for dimensional consistency. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets current environmental and health safety regulations for hazardous substances.