S-90377A193 0.25" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel with black-oxide finish, ideal for harsh industrial environments.
• Enhanced load distribution with 1.5" OD and 0.25" ID, preventing surface damage and loosening under stress.
• Precision dimensional control with 0.110-0.140" thickness ensures consistent performance and secure No. 12 screw fit.
• Durable material construction provides long-term reliability in high-vibration and heavy-load applications.
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries.
• Versatile industrial suitability for machinery, automotive, and construction assemblies requiring inch-system components.

Professional Applications & Engineering Value

This black-oxide 18-8 stainless steel flat washer delivers critical engineering solutions by combining material durability with precise dimensions. The stainless steel core resists rust and chemical exposure, while the black-oxide coating adds an extra layer of protection against abrasion and galling. Designed for No. 12 screw applications, its 1.5" outer diameter effectively disperses clamping force, reducing point stress on soft materials and preventing joint failure. In industries like automotive assembly, industrial machinery, and outdoor equipment, this washer maintains integrity under thermal cycling and dynamic loads, ensuring long-term fastener security without corrosion-induced degradation.

Specification Summary & Compliance

This flat washer adheres to standard inch-system dimensions with an inner diameter of 0.25", outer diameter of 1.5", and thickness range of 0.110-0.140". Manufactured from 18-8 stainless steel with a black-oxide surface treatment, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial and electronic applications requiring environmental safety and material reliability.