S-90377A147 0.25" ID x 1" OD Oversized Washers
Oversized Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coated 18-8 stainless steel, ideal for harsh industrial environments and outdoor applications.
- Enhanced load distribution due to precise 0.25" ID and 1" OD dimensions, reducing surface pressure and preventing fastener loosening.
- Exceptional durability from Rockwell B68 hardness, ensuring long-term performance under mechanical stress and vibration.
- Reliable thickness tolerance of 0.060-0.090" for consistent spacing and secure fit with No. 12 screw sizes.
- Compliance with strict environmental standards including RoHS 3 and REACH, making them safe for global supply chains and regulated industries.
- Broad compatibility with inch-system fasteners, simplifying procurement and assembly in North American and international projects.
Professional Applications & Engineering Value
These black-oxide 18-8 stainless steel flat washers are engineered to address common industrial challenges such as galvanic corrosion, component wear, and fastener failure. The black-oxide surface treatment provides an additional barrier against moisture, chemicals, and UV exposure, extending service life in demanding settings like marine equipment, automotive assemblies, and structural frameworks. With a Rockwell B68 hardness rating, they maintain structural integrity under high clamping forces and cyclic loading, preventing deformation. The precise 0.25" ID and 1" OD ensure optimal alignment and load distribution for No. 12 screw sizes, reducing the risk of joint failure and minimizing maintenance downtime in heavy machinery, electrical enclosures, and construction projects.
Specification Summary & Compliance
This flat washer conforms to inch-system measurement standards with an inner diameter of 0.25", outer diameter of 1", and thickness range of 0.060-0.090". It is manufactured from 18-8 stainless steel with a black-oxide finish and hardness of Rockwell B68. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use.
