Pentair 1/4" Stainless Steel Split Lock Washer

The Pentair 1/4" Stainless Steel Split Lock Washer (part number 192131 or 192131Z) is a specialized structural fastening component engineered for various heavy-duty pool and spa equipment assemblies, most notably securing the structural base plates, motor brackets, and main body tensioning clamp bands of Pentair Clean & Clear, Clean & Clear Plus, and FNS Plus filtration systems. Fabricated from high-tensile, marine-grade 316 stainless steel alloy, this compact spring-style washer features a 1/4-inch nominal internal diameter and a distinct split-ring helical design with slightly raised ends. Its primary mechanical role is to act as a powerful spring take-up device; when a matching hex nut or bolt is torqued down against it, the washer deflects flat, exerting a continuous, heavy spring force that bites into the adjacent mating surfaces. This localized tension prevents the critical structural fasteners from loosening, backing out, or vibrating free under the constant hydraulic pulsing, shifting pressures, and motor vibrations of an active pool pump system up to 50 PSI. Engineered to be completely impervious to rust, oxidation, intense outdoor UV weathering, and continuous submersion in highly corrosive chemical environments like chlorine, bromine, and salt-chlorine generators, this industrial washer prevents dangerous structural hardware failures. Due to its miniature, low-profile metallic ring architecture, this individual split lock washer is exceptionally light, carrying a nominal product and shipping weight of approximately 0.01 pounds (about 0.16 ounces).