S-91169A155 3.9 mm ID x 6.7 mm OD DIN 127B Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance prevents loosening under dynamic loads, ensuring long-term joint integrity.
• High-strength steel construction with Rockwell C44 hardness provides excellent durability and resistance to deformation.
• Precise M3.5 screw sizing (3.9 mm ID, 6.7 mm OD) ensures a perfect fit and optimal spring tension for reliable locking.
• Compliance with DIN 127B standard guarantees consistent quality, dimensional accuracy, and interchangeability.
• RoHS 3 and REACH compliant for safe use in regulated industries and global supply chains.
• Standard split lock design offers easy installation and cost-effective security for repetitive assembly tasks.
• 0.7-0.9 mm thickness provides the ideal balance of flexibility and clamping force for M3.5 fasteners.

Professional Applications & Engineering Value

This M3.5 metric split lock washer is engineered to solve critical loosening issues in vibration-prone environments. Its high-carbon steel material and Rockwell C44 hardness ensure the split ring maintains constant pressure, resisting back-off in machinery, automotive assemblies, and electrical enclosures. The DIN 127B standard design provides predictable performance, making it ideal for industrial maintenance and production lines where fastener failure is not an option. By combining a standard split lock washer type with compliant materials, it delivers reliable locking performance without specialized tools, reducing downtime and warranty claims.

Specification Summary & Compliance

This washer conforms to DIN 127B specifications with an inner diameter of 3.9 mm, outer diameter of 6.7 mm, and thickness range of 0.7-0.9 mm. It is manufactured for M3.5 screw size applications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of restricted substances for use in various industrial and international markets.