NORD-LOCK® Wedge Lock Washer, Stainless Steel 254 SMO® • EN 1.4547 or equivalent, surface-hardened • 254 SMO® – high-performance stainless steel with greater mechanical strength and corrosion resistance than most austenitic stainless steels • High content of chromium, nickel, and molybdenum for excellent resistance to pitting and crevice corrosion • Specifically designed for use in chloride-containing/corrosive environments and saltwater solutions • Secures bolted connections through clamping force rather than friction • Inner side with wedge surface, outer side with radial ribs • Used in pairs • Quick and easy assembly/disassembly with standard tools • Locking function even when lubricated • Reliable locking – also for bolted connections with short clamping lengths • Reusable (depending on operating environment) • CE marked • Laser marking for complete traceability • Designed for screws up to and including strength class A4-80 (stainless steel) • Version sp: enlarged outer diameter to increase the contact area (recommended for use in elongated holes or on soft materials like aluminum).