S-90377A179 0.531" ID x 1.25" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh industrial environments and extending service life.
• Precise dimensional fit with 0.531" ID and 1.25" OD, ensuring accurate alignment and even load distribution for 1/2" screws.
• Enhanced durability and surface protection due to the black-oxide finish, which reduces galling and provides a sleek, professional appearance.
• Reliable performance in demanding applications thanks to the robust 18-8 stainless steel construction, offering excellent strength and fatigue resistance.
• Compliance with global environmental standards, being RoHS 3 and REACH compliant, ensuring safe use and meeting international regulatory requirements.
• Versatile for various industrial uses, from machinery assembly to construction, due to its inch system measurement and flat washer design.
• Cost-effective maintenance solution by reducing wear on components and preventing loosening under vibration, lowering long-term operational costs.

Professional Applications & Engineering Value

This flat washer is engineered to address common industrial challenges such as corrosion, misalignment, and component wear. Made from Black-Oxide 18-8 Stainless Steel, it provides exceptional resistance to rust and chemicals, making it suitable for outdoor, marine, or chemical processing environments. The precise 0.531" ID and 1.25" OD dimensions ensure a snug fit for 1/2" screw applications, distributing loads evenly to prevent surface damage and bolt loosening. Its flat washer design is ideal for general-purpose fastening in machinery, automotive, and structural assemblies, where reliability and longevity are critical. By incorporating this washer, engineers can enhance assembly integrity, reduce maintenance frequency, and ensure compliance with industry standards for safety and performance.

Specification Summary & Compliance

This washer features an inner diameter of 0.531", outer diameter of 1.25", and thickness ranging from 0.110" to 0.140", designed for use with 1/2" screws in inch system measurements. It adheres to standard flat washer dimensions for reliable performance. The product is manufactured from 18-8 stainless steel with a black-oxide surface treatment and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for various industrial applications without hardness rating specifications.