S-95211A140 4.3 mm ID x 12 mm OD DIN 9021 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 316 stainless steel construction for extended service life in harsh environments
• Precise dimensional fit with 4.3mm ID ensuring perfect compatibility with M4 screws and preventing installation issues
• Optimized load distribution through 12mm OD design that minimizes surface pressure and prevents material damage
• Consistent mechanical performance with Rockwell B75 hardness providing reliable strength and deformation resistance
• Guaranteed interchangeability through strict DIN 9021 compliance ensuring seamless integration with existing metric systems
• Enhanced safety and reliability with controlled 0.9-1.1mm thickness for uniform pressure distribution and vibration resistance
• Environmental responsibility with full RoHS 3 and REACH compliance for sustainable industrial operations

Professional Applications & Engineering Value

These M4 flat washers deliver exceptional engineering value through their passivated 316 stainless steel construction, specifically engineered to withstand corrosive industrial environments where ordinary fasteners fail. The DIN 9021 standard ensures precise dimensional accuracy and consistent performance in automated assembly systems, reducing installation time and eliminating compatibility issues. The metric sizing (4.3mm ID × 12mm OD) provides optimal surface coverage for M4 screws, effectively distributing clamp load and preventing joint loosening under vibration. Ideal for chemical processing equipment, marine applications, and food-grade machinery, these corrosion resistant washers maintain integrity in high-moisture and chemical exposure scenarios while meeting stringent industry regulations.

Specification Summary & Compliance

Manufactured to DIN 9021 dimensional standards with precise metric tolerances, featuring 4.3mm internal diameter, 12mm outer diameter, and 0.9-1.1mm thickness range. Constructed from passivated 316 stainless steel with Rockwell B75 hardness for consistent mechanical properties. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for global industrial applications.