UNSPSC 31161833: Bonded washer

A type of washer that acts like a simple pressure gasket providing leak-proof sealing from water, gases, oils and other fluids.

UNSPSC 31161833 Bonded washer, a Commodity code, encompasses industrial fastening hardware — specifically lock washers and related securing components — that state and local governments procure for equipment maintenance, infrastructure repair, and routine operational needs. The code captures both large construction and renovation projects requiring bonded washers as component parts and direct purchase orders for packaged fastening supplies to maintain fleet vehicles, transit systems, water treatment facilities, and municipal infrastructure. Issuing bodies under this code include transit authorities, city and county public works departments, and water utilities. The Dallas Area Rapid Transit Authority (DART) and municipalities operating water treatment facilities represent the recent buyer mix, though the actual scope of bonded washer procurement likely extends across maintenance and capital projects at other transit agencies and municipal departments that do not surface in recent posted notices.

Recent activity shows two distinct solicitation patterns. The Dallas Area Rapid Transit Authority issued a purchase order on January 21, 2026, due January 28, 2026, for Washer Lock 7/16" Medium (Package of 100) through competitive bidding on the BONFIRE platform, with Net 30 payment terms and FOB Destination freight requirements. Separately, the City of Lavonia, Georgia, operating under Fayette County jurisdiction, posted a sealed competitive bid (PE66940NONST2026000000005) on April 24, 2026, due May 26, 2026, for the Water Treatment Plant 2026 Improvements project — a comprehensive infrastructure upgrade that includes bonded washers and fastening hardware as component materials within a broader nine-month construction contract subject to Davis-Bacon prevailing wage requirements and Build America, Buy America sourcing rules. Recent activity concentrates in Georgia and Texas, with procurement flowing through both routine purchase orders and embedded specifications within capital project bids.