URI
Notation
621.8
Caption
Machine elements. Motive power engineering. Materials handling. Fixings. Lubrication
Including
Bearings. Couplings. Transmissions. Gears. Clutches. Fixings (screws, bolts, nails etc). Lubrication. Hoists. Conveyors. Stackers. Fork-lifts. Cranes. Transporters. Lifts. Escalators. Levellers. Excavators. Dredgers
Scope Note
Class here information about power transmission, machine elements etc. treated generally
Application Note
If machine elements are treated as parts of specific kinds of machinery, class with the subject, adding auxiliary numbers from 62-1/-9
Broader class
621  Mechanical engineering in general. Nuclear technology. Electrical engineering. Machinery