UNSPSC 31161829: Retaining washer

A type of washer used in applications requiring pre-assembly of the screw and washer, to reduce final assembly cost.

UNSPSC 31161829 Retaining washer is a Commodity code covering fastening hardware components used across municipal infrastructure and transit systems. State and local governments procure retaining washers as component parts in construction, maintenance, and repair work—most visibly in water treatment plant upgrades, transit vehicle maintenance, and general infrastructure projects. The code captures both bulk commodity purchases (packages of standard fasteners for inventory) and component-level procurement embedded within larger capital construction or systems-maintenance contracts. Issuing bodies span municipal utilities, regional transit authorities, and city public works departments; recent activity shows both standalone fastener orders and washers specified as part of comprehensive facility upgrades.

Recent opportunities show geographic concentration in the South and Southwest. The Dallas Area Rapid Transit Authority (DART) posted a purchase order for Washer Lock 7/16" Medium (Package of 100) with a response date of January 28, 2026, as a straightforward goods procurement using the BONFIRE platform with Net 30 payment terms and FOB Destination shipping required. The City of Lavonia, Georgia issued a sealed competitive bid (Solicitation PE66940NONST2026000000005) due May 26, 2026 for Water Treatment Plant 2026 Improvements, a nine-month capital construction project that implicitly incorporates retaining washers and other fastening hardware as component materials within modifications to raw water pump stations, mixing basins, filter systems, and clearwell storage tanks. The Georgia project requires a Georgia Utility Contractor license, prevails wage compliance, DBE participation goals (4.0% minority and women-owned business participation), and Build America, Buy America compliance. Sealed-bid and purchase-order vehicles dominate the recent activity, with pre-bid conferences and written question submission windows typical for larger municipal projects.