333613: Mechanical Power Transmission Equipment Manufacturing

What this code covers

Census defines 333613 as plants that make mechanical power transmission equipment other than the kinds built for motor vehicles and aircraft. The definition lists plain bearings, clutches other than vehicle and electromagnetic control types, couplings, joints, and drive chains. Industry usage adds gears, speed reducers, sprockets, pulleys, and shafts.

For defense that means shipboard reduction gear components and couplings, winch and hoist drives, antenna and turret drive parts, gearboxes for ground support and test equipment, and plain bearings and bushings bought by stock number. Ball and roller bearings sit in 332991. Vehicle and aircraft drivetrain parts have their own codes, though notices do not always follow that line.

What federal buyers typically ask for

DLA Land and Maritime posts most of the volume: plain bearings, bushings, gears, sprockets, couplings, and shafts by national stock number, often on long-term contracts. Navy supply activities and shipyards post reduction gear and coupling components for ship overhauls. Depots post gearbox and drive parts for repair lines.

Gears carry a quality grade and inspection requirement with charts, and the drawing usually names the material, heat treat, case depth, and hardness. Expect material and heat treat certs, magnetic particle inspection on steel gears, first article for a new source, and a certificate of conformance. Plain bearings cite a material specification for the bronze, steel, or composite liner. Steel and nickel alloy content brings the DFARS specialty metals clause. Critical ship and aviation drive parts often carry an approved source list. Drawings are commonly export controlled.

Small business set-asides are common on bushings, sprockets, and standard couplings. Critical gearing tends to go unrestricted to approved sources.