UNSPSC 31161832: Countersunk washer

A type of washer that provides the same function as a flat washer except when used with flat head screws. In this case, it provides a sealing function for flat head screws used in a countersunk hole.

UNSPSC 31161832 Countersunk washer, a Commodity code, describes fastener components that state and local governments procure for maintenance, repair, and construction projects. Recent solicitation activity shows the code capturing general fastener procurement rather than countersunk washers specifically—the posted opportunities include bolts for transit vehicle and infrastructure maintenance and broader construction material supply for water treatment plant upgrades. Issuing bodies range across transit authorities, municipal water departments, and city engineering offices, each sourcing fasteners and related hardware as subordinate line items within larger maintenance or capital projects rather than as standalone commodity purchases.

The Dallas Area Rapid Transit Authority posted a purchase order in early September 2026 for 1/2"-13 X 2-3/4" bolts (solicitation 2100828, due September 11, 2026) under standard transit procurement terms including FOB Destination freight and Net 30 payment. The City of Lavonia, Georgia, issued a sealed-bid IFB in April 2026 for Water Treatment Plant 2026 Improvements (PE66940NONST2026000000005, due May 26, 2026) encompassing comprehensive facility upgrades with a nine-month construction window and subject to prevailing wage and Build America, Buy America compliance, which would typically require fastener sourcing meeting domestic-content standards. Geographic activity appears concentrated in the South, with Texas and Georgia represented in the recent sample. The code shows limited recent dedicated-commodity procurement under its nominal scope; most fastener buys appear embedded within larger IFB or construction contracts rather than solicited as discrete purchase orders.