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 that describes fastener components used in mechanical assembly and maintenance applications across state and local infrastructure and transit systems. Recent solicitations under this code show state and local governments procuring specific bolt and washer specifications for rolling stock maintenance, facility repairs, and infrastructure upkeep. The issuing bodies include transit authorities and municipal water utilities, each managing specialized asset maintenance requiring standardized fastener procurement. These organizations typically issue RFQs and purchase orders through competitive bidding platforms that require vendor registration and adherence to specific shipping, payment, and delivery terms.

Dallas Area Rapid Transit Authority (DART) posted a solicitation on September 3, 2026, for bolts (1/2"-13 X 2-3/4") under Purchase Order 2100828 with bids due September 11, 2026, requiring FOB Destination freight terms and Net 30 payment with delivery timing as an essential contract term. A City of Lavonia, Georgia water treatment plant upgrade project posted April 24, 2026, with a May 26, 2026, bid deadline, included fastener and hardware specifications as part of a comprehensive facility modernization, though fasteners were subordinate to the main construction scope. DART represents the primary recent activity in this code, reflecting transit authority demand for standardized fastener replacement and maintenance inventory. Geographic activity appears concentrated in the South and Southwest, with Texas (DART) and Georgia (Lavonia) showing documented recent procurement. The code sees episodic rather than continuous activity, driven by scheduled maintenance cycles and capital projects rather than routine consumables procurement.