UNSPSC 31161830: Wave washer

A type of washer designed to offer a compensating spring force and maintain a load or take up shock.

UNSPSC 31161830 Wave washer is a Commodity code that describes industrial fastening hardware components, primarily lock washers and similar retaining fasteners procured by state and local transportation authorities, water utilities, and municipal infrastructure departments for equipment assembly, maintenance, and capital improvement projects. State and local governments buying under this code acquire these components as stock items for routine operations and as bill-of-material inputs to larger construction and renovation projects. Issuing bodies include transit authorities such as the Dallas Area Rapid Transit Authority (DART), water and wastewater utilities managing treatment plant upgrades, and municipal public works departments executing infrastructure improvements. The procurement pattern shows primarily small-quantity purchase orders for packaged fasteners (e.g., 100-unit packages) alongside occasional larger infrastructure projects that incorporate these components as part of comprehensive mechanical and structural assemblies.

Recent activity appears concentrated in Texas and Georgia. The Dallas Area Rapid Transit Authority posted a purchase order for Washer Lock 7/16" Medium (Package of 100) on January 21, 2026, with a submission deadline of January 28, 2026, through the BONFIRE registration system, requiring FOB Destination shipping and Net 30 payment terms. The City of Lavonia, Georgia, issued a sealed competitive bid (solicitation PE66940NONST2026000000005) on April 24, 2026, for Water Treatment Plant 2026 Improvements, due May 26, 2026, which encompasses a comprehensive facility upgrade including installation of new equipment and mechanical systems where fastening hardware would be incorporated as part of the bill of materials. The latter reflects a larger-scale municipal infrastructure project with a nine-month construction schedule and substantial scope, while the DART procurement represents the routine component replenishment typical of ongoing transit system maintenance.