S-98029A059 1.563" ID x 2.75" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through black-oxide steel surface treatment, extending service life in demanding industrial environments
• Optimal load distribution with 2.75" outer diameter, preventing surface damage and maintaining joint integrity under heavy loads
• Precision fit for 1 1/2" screws with 1.563" inner diameter, ensuring secure fastening and reducing installation time
• Consistent thickness control between 0.355-0.380" provides reliable performance and predictable compression characteristics
• Compliance with international regulations including RoHS 3 and REACH, ensuring global supply chain compatibility
• Durable steel construction delivers repeated use capability without deformation in high-stress applications
• Standard inch measurements facilitate easy replacement and compatibility with existing inch-system equipment

Professional Applications & Engineering Value

This black-oxide steel flat washer addresses critical engineering challenges in heavy machinery, structural steelwork, and industrial equipment assembly. The black-oxide surface treatment provides superior corrosion protection compared to plain steel, significantly reducing maintenance frequency in humid or chemically aggressive environments. With its substantial 2.75" outer diameter, this flat washer effectively distributes clamping forces across wider surface areas, preventing material crushing in soft substrates and reducing stress concentration around 1 1/2" screw connections. The precise 1.563" inner diameter ensures proper centering and alignment during installation, minimizing the risk of cross-threading and assembly errors in time-sensitive industrial operations. These features make it particularly valuable for construction equipment, heavy-duty manufacturing fixtures, and infrastructure projects where reliability and longevity are paramount.

Specification Summary & Compliance

This flat washer maintains standard inch system dimensions with inner diameter of 1.563", outer diameter of 2.75", and thickness ranging from 0.355" to 0.380". Manufactured from black-oxide steel, it is specifically engineered for use with 1 1/2" screw size applications. The product fully complies with RoHS 3 (2015/863/EU) standards under exemption 6(a) for lead as an alloying element in steel and meets REACH (EC 1907/2006) compliance requirements as of January 17, 2023, including the 233 Substance of Very High Concern (SVHC) list, ensuring environmental responsibility and regulatory acceptance in global markets.