UNSPSC 31161822: Tooth lock washer

A type of lock washer that has teeth around either the inner or outer perimeter of the washer to reduce vibration.

UNSPSC 31161822 Tooth lock washer is a Commodity code covering fastening hardware components — specifically split-ring and toothed-lock washers used in mechanical assemblies, equipment maintenance, and infrastructure projects. State and local governments procure these items for routine maintenance, repair, and construction work across water utilities, transit systems, public works departments, and facilities management. The recent opportunities show a divergence in scale: one solicitation is a direct purchase-order request for a single fastener product (100-count package of 7/16" medium tooth lock washers), while another large water treatment facility upgrade project would incorporate such components as part of broader construction specifications without isolating fastener procurement as a separate line item. The code serves both as a standalone consumable good for inventory replenishment and as a subordinate component embedded within larger capital projects.

Activity under this code concentrates in utilities and transit authorities. The Dallas Area Rapid Transit Authority (DART) issued a purchase order on January 21, 2026, due January 28, 2026, for Washer Lock 7/16" Medium (Package of 100) under solicitation 2097555, requiring FOB Destination shipping and Net 30 payment terms through the BONFIRE system. The City of Lavonia, Georgia, through Fayette County, posted an IFB on April 24, 2026, due May 26, 2026 (PE66940NONST2026000000005), for Water Treatment Plant 2026 Improvements—a comprehensive nine-month facility upgrade that would include fastening hardware as part of specifications. Geographic activity spans Georgia and Texas, with recent procurement concentrated in the Southeast and Texas transit corridors. The fastener market under this code remains fragmented across small purchase orders and embedded specifications within larger projects, with no standout geographic concentration.