UNSPSC 31151611: Silent chain

A multi-leaf inverted tooth steel link chain.

UNSPSC 31151611 Silent chain is a Commodity code covering industrial and commercial chain products that state and local governments procure for operational and maintenance purposes across multiple departments. Recent state and local solicitations show demand for specialized chain inventory — transport-grade, alloy steel, galvanized proof coil, and zinc-plated variants in specific gauges and lengths — for use by municipal divisions, county departments, and law enforcement agencies. The City of Tampa Purchasing Department and Hillsborough County represent active repeat buyers under this code, soliciting chain alongside related rigging hardware (hooks, shackles, slings) in integrated procurements. Vendors pursue these opportunities through RFQ (Request for Quotes) notices with firm fixed pricing, FOB Destination delivery, and aggregate or line-item award discretion held by the issuing body. Compliance requirements include proof of insurance prior to award, E-Verify verification where required, and adherence to state procurement statutes and local purchasing ordinances; payment typically follows 30 days after receipt and acceptance of materials.

Activity under this code concentrates in Florida, where the City of Tampa and Hillsborough County have posted multiple RFQs for chain inventory and related securing hardware in 2026. The most recent representative opportunity is City of Tampa RFQ 26P00328 (Chain for Inventory), posted May 12, 2026, with a June 15, 2026 deadline, seeking six line items of specialized chain ranging from 3/16 inch to 3/8 inch proof coil and transport-grade stock, with delivery required within five business days of order and a one-year contract term. An earlier Tampa RFQ 26P00214 (Hooks and Shackles), posted March 18, 2026 with an April 15, 2026 deadline, bundled 316 stainless steel chain with lifting hardware across 20 line items. Beyond Florida, Sourcewell cooperative purchasing activity under law enforcement equipment (RFP 061626, June 16, 2026 deadline) spans multiple Washington counties and broader public-sector participation, though that solicitation's scope extends well beyond chain to encompassing law enforcement gear more broadly. No set-aside designations are explicitly identified in the available Tampa solicitation documents.