UNSPSC 31171721: Propulsion system gear

Propulsion transmission is the mode of transmitting and controlling propulsion power of a machine. The term transmission properly refers to the whole drivetrain, including clutch, gearbox, prop shaft (for rear-wheel drive vehicles), differential, and final drive shafts.

UNSPSC 31171721 Propulsion system gear (Commodity) covers metal components used in mechanical transmission and drivetrain assemblies—encompassing gears, fasteners, hardware, and structural elements state and local governments procure for equipment maintenance, infrastructure construction, and facility operations. Recent solicitations under this code reflect a narrow, fragmented buying pattern dominated by Harris County, Texas, which has posted multiple ITBs for fasteners, door hardware, sign posts, mounting hardware, and miscellaneous mechanical components since May 2026. The Texas A&M University System posted a stainless steel diaphragm plate ITB in October 2026, and Monroe County, Florida solicited door-replacement work in July 2026 that required hollow metal frames and associated hardware. The work itself spans discrete industrial-maintenance and infrastructure-support categories rather than forming a unified propulsion-system focus; fasteners and mounting hardware dominate the recent record, with little activity tied to powertrain or transmission-specific components that the code name suggests.

Harris County leads the issuing-body mix, accounting for the majority of recent opportunities; the county has posted at least five ITBs between May and August 2026 for screw fasteners, sign posts and mounting hardware, door locks and replacements, communications infrastructure maintenance, and ADA-compliant platform hardware. The geographic spread concentrates in Texas, with secondary activity in Florida. Representative recent opportunities include Harris County's ITB for screw fasteners and related items (ITB 260081, due August 24, 2026), Harris County's ITB for sign posts, mounting hardware and related items (ITB, due September 21, 2026), the Texas A&M University System's stainless steel diaphragm plate ITB (TAMUS-ITB-26-0547, due October 28, 2026, with bidding exclusively through AggieBid), and Monroe County's door-replacement RFS at the Sheriff's Office Hangar in Marathon, Florida (RFS642, due July 29, 2026 via Bonfire). All posting dates and response deadlines cited have passed as of October 20, 2026.