S-98040A103 5.3 mm ID x 15 mm OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish, extending service life in harsh industrial environments
• Enhanced load distribution thanks to precise Rockwell 15N80 hardness, preventing surface damage and fastener loosening
• Perfect fit for M5 screws with 5.3mm ID and 15mm OD dimensions, ensuring secure fastening and vibration resistance
• Consistent thickness control (3.0-3.9mm) for uniform pressure application and reliable joint integrity
• Full regulatory compliance with RoHS 3 and REACH standards, meeting global environmental and safety requirements
• Durable steel construction provides excellent wear resistance and long-term performance in demanding applications
• Metric precision engineering ensures compatibility with international standards and replacement parts

Professional Applications & Engineering Value

These M5 metric flat washers deliver exceptional engineering value in industrial applications where corrosion resistance and load distribution are critical. The black-oxide steel surface treatment creates a protective barrier against moisture, chemicals, and environmental factors, significantly reducing maintenance needs in automotive assembly, machinery manufacturing, and outdoor equipment. The Rockwell 15N80 hardness rating ensures these washers maintain their structural integrity under sustained pressure, preventing deformation that could compromise fastened joints. With precise 15mm outer diameter and 5.3mm inner diameter dimensions, they provide optimal surface coverage for M5 fasteners while the controlled thickness range guarantees consistent clamping force. This combination of material properties and dimensional accuracy makes them ideal for vibration-prone applications, electrical enclosures, and heavy-duty mechanical systems where reliability cannot be compromised.

Specification Summary & Compliance

This flat washer features metric dimensions with 15mm OD, 5.3mm ID, and 3.0-3.9mm thickness range, designed specifically for M5 screw applications. Manufactured from black-oxide steel with Rockwell 15N80 hardness for consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations (updated January 17, 2023, 233 SVHC), meeting international environmental and safety standards for industrial components.