UNSPSC 31161728: Coupling nuts

UNSPSC 31161728 Coupling nuts (Commodity) represents a narrow fastener category that state and local governments buy for transit operations, water utility infrastructure, and industrial maintenance. Recent activity under this code shows a mismatch between the nominal commodity scope and actual procurement: most solicitations tagged to this code involve unrelated fastener types (elastic stop nuts, hex nuts, washers) used for routine vehicle and equipment maintenance, while a substantial water treatment plant construction project appears misclassified. The Dallas Area Rapid Transit Authority (DART) accounts for the majority of recent tagged opportunities, procuring small packages of various nut and fastener specifications for fleet and operations support. Transit authorities and municipal utilities represent the primary issuing-body types, with no evidence of state procurement offices or school districts soliciting under this code in the recent activity set.

Activity concentrates in Texas and California. DART has posted multiple fastener procurements since January 2026—elastic stop nuts (1/4-28 zinc, package of 100) due February 5, 2026; M8 hex stainless steel nuts with suspension springs due January 28, 2026; and 9/16"-18 Grade 8 nuts (box of 25) due January 28, 2026—all through BONFIRE registration with FOB Destination shipping required and Net 30 payment terms. Riverside County, California issued a Request for Bid for miscellaneous Cla-Val parts with a February 13, 2026 deadline. A City of Lavonia, Georgia sealed competitive bid for water treatment plant improvements (due May 26, 2026) was tagged to this code but involves comprehensive facility construction rather than coupling nuts. The code shows limited relevant recent activity; suppliers pursuing this classification should focus on routine maintenance consumables for transit authorities and utilities rather than expect broader municipal infrastructure procurement.