S-95481A181 4.3 mm ID x 16 mm OD Finishing Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with nylon plastic construction, eliminating rust and chemical degradation in harsh environments
• Excellent temperature performance from -40°F to 180°F, maintaining structural integrity across diverse operating conditions
• Optimized flush mounting with 90° countersink angle and rounded face design for seamless surface integration
• Enhanced durability with Rockwell R120 hardness rating, resisting wear and deformation under load
• Precise M4 screw compatibility with 4.3mm ID and 16mm OD dimensions for secure, vibration-resistant fastening
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications
• Lightweight electrical insulation properties ideal for electronic assemblies and sensitive equipment

Professional Applications & Engineering Value

This M4 nylon countersunk washer delivers critical engineering solutions where metal fasteners fail. The nylon plastic material provides inherent corrosion resistance, eliminating galvanic reactions in mixed-material assemblies while offering excellent electrical insulation for sensitive electronics. The 90° countersink angle and rounded face design ensure flush surface mounting, preventing snagging and improving aesthetic integration in consumer products and industrial equipment. With its broad temperature range from -40°F to 180°F, this metric washer maintains dimensional stability in environments where thermal cycling would compromise metal alternatives. The combination of Rockwell R120 hardness and compliant material makes it ideal for vibration-dampening applications in automotive, aerospace, and electronic enclosures where both mechanical performance and regulatory compliance are mandatory.

Specification Summary & Compliance

This metric countersunk washer features precise dimensional specifications with 4.3mm ID, 16mm OD, and 3.7mm overall height, engineered for M4 screw compatibility. Manufactured to exacting standards with a 90° countersink angle and rounded face profile. The component demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency. Temperature performance is validated from -40°F to 180°F, with mechanical properties including Rockwell R120 hardness for consistent performance in industrial fastening applications.