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 (Commodity) encompasses fastening hardware — washers, bolts, nuts, and related mechanical components — that state and local governments procure for infrastructure maintenance, facility repairs, and capital projects. Recent solicitations show a mismatch between the code's nominal scope and actual buying activity: the largest recent opportunity tagged to this code is a comprehensive water treatment plant upgrade involving construction services, engineering, and civil works rather than fasteners, while a direct fastener purchase (washer lock components) appears in a separate DART procurement showing what genuine fastener buying under this code looks like.

The issuing-body mix includes municipal water and utility authorities and regional transit agencies. The City of Lavonia, Georgia (Fayette County jurisdiction) issued a sealed IFB on April 24, 2026, for Water Treatment Plant 2026 Improvements (due May 26, 2026) involving raw water pump station modifications, filtration units, chemical feed systems, and clearwell storage upgrades — work requiring Davis-Bacon prevailing wage compliance, a Georgia Utility Contractor license, and 4.0% DBE participation goals, with a 270-day construction schedule and $500/day liquidated damages for delays. The Dallas Area Rapid Transit Authority (DART) posted a purchase order on January 21, 2026 (due January 28, 2026) for Washer Lock 7/16" Medium in packages of 100, requiring FOB Destination shipping with freight included, Net 30 payment terms, and submission through the BONFIRE registration system. Recent activity is concentrated in Georgia and Texas, with the water treatment plant procurement representing the primary recent signal but appearing to be miscoded relative to the commodity's true scope.