S-92908A127 0.125" ID x 0.438" OD Finishing Washers
Finishing Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
Geometric Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance from the black-oxide steel finish, extending component life in harsh environments
- Precise flush-mounting with an 82° countersink angle for seamless integration with No. 4 screws
- Optimized load distribution through a 0.438" outer diameter, reducing surface pressure and material stress
- Secure screw retention with a 0.125" inner diameter, minimizing loosening from vibration
- Enhanced mechanical durability due to Rockwell 15N80 hardness, resisting deformation under load
- Global regulatory compliance with RoHS 3 and REACH standards, ensuring safe use in international markets
- Consistent dimensional accuracy in inch measurements for reliable fit in standardized assemblies
Professional Applications & Engineering Value
These black-oxide steel countersunk washers address critical engineering challenges in industrial fastening. The 82° countersink angle ensures a flush surface finish, eliminating protrusions in machinery, automotive, and electronics enclosures where space and safety are paramount. Made from black-oxide coated steel, they provide excellent corrosion resistance against moisture and chemicals, reducing maintenance in demanding applications like outdoor equipment or manufacturing lines. With a Rockwell 15N80 hardness, they maintain structural integrity under repetitive stress, preventing failure in high-vibration environments. Their precise 0.125" ID and 0.438" OD guarantee compatibility with No. 4 screws, streamlining assembly processes while meeting RoHS and REACH environmental standards for global supply chains.
Specification Summary & Compliance
This washer adheres to inch-based dimensional standards with an inner diameter of 0.125", outer diameter of 0.438", and thickness range of 0.084–0.104". The 82° countersink angle conforms to common engineering specifications for flush mounting. Material and manufacturing comply with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) as of January 17, 2023, with no SVHC exceedances. Hardness is certified to Rockwell 15N80, ensuring consistent performance in industrial applications.
