S-91013A721 0.26" ID x 0.487" OD ASME B18.21.1 Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through the split lock design that maintains constant spring tension under dynamic loads
• Lightweight aluminum construction provides excellent corrosion resistance while reducing overall assembly weight
• Precision dimensional accuracy with 0.26" ID and 0.487" OD ensures perfect fit for 1/4" screw applications
• Enhanced durability from Rockwell B87 hardness rating for long-lasting performance in demanding environments
• Reliable locking action through standard split configuration that prevents loosening from vibration and thermal cycling
• Industry-standard compliance with ASME B18.21.1 specifications guarantees consistent quality and performance
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

These aluminum split lock washers deliver exceptional engineering value in applications where vibration resistance and corrosion prevention are critical. The split lock washer design creates continuous spring tension that counters rotational forces, effectively preventing fastener loosening in machinery, automotive assemblies, and electronic enclosures. Made from aluminum material, these washers provide natural corrosion resistance without additional plating, making them ideal for outdoor equipment and marine applications. The Rockwell B87 hardness ensures the washer maintains its locking capability through repeated compression cycles, while the precise 0.26" ID and 0.487" OD dimensions guarantee proper seating on 1/4" screws. This combination of material properties and mechanical design solves common industrial challenges of fastener failure in high-vibration environments.

Specification Summary & Compliance

This standard split lock washer features precise inch measurements with 0.26" internal diameter, 0.487" external diameter, and 0.062" thickness, specifically engineered for 1/4" screw applications. Manufactured to ASME B18.21.1 standards for dimensional accuracy and performance requirements. The washer demonstrates full compliance with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) environmental standards, including the latest SVHC updates as of June 14, 2023. The aluminum construction with Rockwell B87 hardness rating ensures consistent mechanical properties and reliable locking performance across industrial applications.