S-90339A040 Easy-Install Slotted Washers
Easy-Install Slotted 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
- Exceptional corrosion resistance with black-oxide steel construction, extending service life in demanding environments
- Superior mechanical strength from Rockwell 15N80 hardness, preventing deformation under heavy loads
- Precise slot alignment with 25/32" width and 1 5/8" depth for secure 3/4" screw retention
- Consistent thickness control (0.428-0.448") ensuring uniform pressure distribution across mating surfaces
- Full regulatory compliance with RoHS 3 and REACH standards for global industrial applications
- Optimized dimensional stability with 2.5" OD providing reliable bearing surface area
- Enhanced durability through hardened steel construction resisting wear in high-vibration applications
Professional Applications & Engineering Value
This black-oxide steel slotted washer delivers critical engineering solutions for industrial assembly challenges. The Rockwell 15N80 hardness provides exceptional resistance to deformation when securing 3/4" screws in structural applications, while the precise slot dimensions (25/32" width × 1 5/8" depth) ensure perfect alignment during installation. The black-oxide surface treatment creates a protective barrier against moisture and chemical exposure, making these industrial washers ideal for outdoor equipment, heavy machinery, and manufacturing systems where corrosion resistance and dimensional accuracy are paramount. The 2.5" outer diameter distributes clamp load effectively across wider surfaces, preventing material damage in wood, metal, and composite assemblies.
Specification Summary & Compliance
Manufactured to inch system specifications with 2.5" OD and controlled thickness range of 0.428-0.448". Features precision slotted design with 25/32" slot width and 1 5/8" slot depth compatible with 3/4" screws. Hardness rated at Rockwell 15N80 for consistent performance. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as steel alloying element and REACH (EC 1907/2006) regulations updated January 17, 2023, covering 233 SVHC substances.
