UNSPSC 31161521: Carriage screw

A mushroom-shaped head screw with a square neck, made of steel or stainless steel, this screw is under the DIN standard number 603, it usually includes a hex nut.

UNSPSC 31161521 Carriage screw is a Commodity code covering fastener hardware used in maintenance, repair, and construction work across state and local facilities. State and local governments procure carriage screws as consumable supplies under broader repair, maintenance, and construction service contracts rather than as standalone fastener line items. The code appears primarily in solicitations for commercial trades, building maintenance, and facility improvement work issued by cities, counties, and educational cooperatives establishing master-service agreements or job-order-contracting (JOC) frameworks to support ongoing operational and capital needs. These issuing bodies typically seek multiple qualified vendors to provide supplies and labor across diverse facility systems and building trades.

Recent activity centers on Texas jurisdictions. The Harris County Department of Education and its cooperative purchasing partner Choice Partners issued a competitive sealed proposal (26021MR) in May 2026 for Painting, Drywall, Acoustical Ceilings, and Flooring services under a JOC-IDIQ structure with a maximum annual aggregate contract price of $200 million and an initial one-year term with up to three automatic one-year renewals; the proposal deadline was May 15, 2026, with questions due May 8, 2026 and a tentative award date of July 15, 2026. The City of Lubbock issued an ITB (2619925SR) in late September 2026 for Commercial Trades & Repair Services and Commercial Specialty Services on an as-needed basis, with proposals due October 20, 2026. Both solicitations establish indefinite-quantity frameworks for multiple awards across vendor categories, indicating steady demand for fastener supplies as part of broader building-trades and maintenance contracts rather than isolated procurement events.