UNSPSC 31151611: Silent chain

A multi-leaf inverted tooth steel link chain.

UNSPSC 31151611 Silent chain is a Commodity code covering specialized chain products for operational inventory and equipment use. State and local governments procure under this code primarily transport-grade and proof-coil chains in various gauges and materials — galvanized, alloy steel, and zinc-plated variants — sized for load-bearing and material-handling applications. Recent solicitations show demand spanning municipal operations, law enforcement equipment provisioning, and departmental supply chains; issuing bodies include city purchasing departments procuring for multiple internal divisions, counties, and cooperative purchasing organizations serving regional and national public entities.

The City of Tampa Purchasing Department's RFQ 26-P-00328, posted May 12, 2026 and closed June 15, 2026, sought six line items of specialized chain ranging from 100 to 800 feet with specific technical specifications (Grade 30 and Grade 100 alloys, 3/8-inch to 1/4-inch diameters), brand constraints (Gunnebo, Campbell Weis 1250), and FOB Destination delivery within five business days; Sourcewell, on behalf of Franklin, Grant, Grays Harbor, Chelan, and Yakima counties in Washington and other multi-state participating entities, issued RFP 061626 June 16, 2026 for law enforcement equipment establishment, which may encompass chain products as part of a broader cooperative contracting solution. Activity concentrates in Florida (Tampa/Hillsborough County) and Washington state through Sourcewell's multi-jurisdictional cooperative framework, though the cooperative model signals broader geographic and organizational reach across participating U.S. and Canadian public entities.