S-98029A030 0.344" ID x 0.75" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced Corrosion Resistance: Black-oxide steel surface treatment provides durable protection against rust and environmental degradation in demanding industrial settings.
• Optimal Load Distribution: Precision-engineered 0.75" outer diameter and flat design effectively spread clamping force, preventing surface damage and joint loosening.
• Perfect 5/16" Screw Compatibility: 0.344" inner diameter ensures secure fit and reliable performance with standard 5/16" fasteners.
• Consistent Thickness Performance: 0.105-0.130" thickness range guarantees uniform pressure distribution and vibration resistance across assemblies.
• Regulatory Compliance Assurance: Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards for safe, environmentally responsible industrial use.
• Durable Steel Construction: High-strength material maintains structural integrity under heavy loads and repeated assembly cycles.
• Inch System Standardization: Manufactured to inch measurement specifications for seamless integration with existing North American equipment and components.

Professional Applications & Engineering Value

These black-oxide steel flat washers deliver critical engineering solutions for industrial assembly challenges. The corrosion-resistant black-oxide finish significantly extends service life in humid or chemically aggressive environments, reducing maintenance frequency and replacement costs. Precision-machined to 0.344" ID and 0.75" OD specifications, they provide reliable load distribution that prevents fastener embedding and material deformation in 5/16" screw applications. The controlled 0.105-0.130" thickness ensures consistent clamping force in automotive, machinery, and structural assemblies, while the inch-system compatibility makes them ideal for North American manufacturing and MRO operations requiring dependable vibration resistance and long-term joint stability.

Specification Summary & Compliance

Manufactured to standard inch system dimensions with 0.344" inner diameter and 0.75" outer diameter. Features consistent 0.105-0.130" thickness for reliable performance with 5/16" screws. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as steel alloying element and REACH (EC 1907/2006) regulations (SVHC list as of 01/17/2023). Designed for industrial applications requiring precise dimensional accuracy and environmental regulation adherence.