S-92908A250 5.3 mm ID x 22 mm OD Finishing Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish, extending service life in harsh industrial environments
• Perfect flush mounting enabled by 90° countersink angle for seamless integration with flat-head fasteners
• Exceptional surface hardness (Rockwell 15N80) prevents deformation under high-load applications
• Precision dimensional fit with 5.3mm ID specifically engineered for M5 screw systems
• Optimal load distribution through 22mm OD design, reducing surface pressure and material stress
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global manufacturing requirements
• Consistent thickness tolerance (3.2-3.8mm) ensuring reliable performance in automated assembly processes

Professional Applications & Engineering Value

These M5 metric countersunk washers solve critical engineering challenges in industrial assembly where flush surface requirements meet demanding mechanical loads. The black-oxide steel construction provides essential corrosion protection without compromising dimensional stability, while the precise 90° countersink angle ensures perfect alignment with standard flat-head screws. This combination addresses common issues of premature wear and improper seating in automotive, machinery, and structural applications. The Rockwell 15N80 hardness rating guarantees maintained clamping force in high-vibration environments, making these precision washers ideal for heavy-duty equipment where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise metric dimensions (5.3mm ID × 22mm OD × 3.2-3.8mm thickness) with 90° countersink angle for standard flat-head fasteners. Hardness certified to Rockwell 15N80 specifications. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as steel alloying element and REACH (EC 1907/2006) regulations updated January 2023, ensuring environmental responsibility in industrial supply chains.