S-98035A112 31 mm ID x 44 mm OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance through black-oxide steel construction, extending service life in demanding industrial environments
• Exceptional load distribution with 44mm outer diameter, preventing surface damage and maintaining joint integrity under M30 screw loads
• Precision dimensional fit with 31mm inner diameter ensuring secure fastening and vibration resistance in metric assemblies
• Enhanced mechanical durability with Rockwell 15N80 hardness rating, providing reliable performance in high-stress applications
• Regulatory compliance assurance with full RoHS 3 and REACH compliance, meeting international environmental and safety standards
• Optimized thickness range (3.5-4.4mm) offering flexibility while maintaining consistent pressure distribution across mating surfaces
• Industrial-grade reliability through metric system compatibility, ensuring seamless integration with global engineering specifications

Professional Applications & Engineering Value

This M30 flat washer delivers critical engineering solutions through its black-oxide steel composition and precision dimensions. The 31mm ID provides exact clearance for M30 fasteners, eliminating play and reducing vibration-induced loosening in heavy machinery, structural steel connections, and industrial equipment assemblies. The 44mm OD significantly increases bearing surface area, preventing embedment in softer materials and distributing clamp load effectively across joined components. With Rockwell 15N80 hardness, this metric washer maintains dimensional stability under extreme pressure, while the black-oxide surface treatment offers corrosion protection in humid or chemically aggressive environments. These combined features make it ideal for automotive manufacturing, construction frameworks, and industrial machinery where flat washer reliability directly impacts operational safety and maintenance intervals.

Specification Summary & Compliance

Manufactured to metric dimensional standards with precise inner diameter (31mm), outer diameter (44mm), and thickness range (3.5-4.4mm) specifications. The black-oxide steel construction meets industrial hardness requirements (Rockwell 15N80) for consistent performance. Full compliance 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, 233 SVHC) ensures environmental responsibility and global market acceptance.