- New Departure of Bristol, Connecticut manufactured this small caged ball bearing around 1950. The bearing is inscribed “N. D. 39B.” New Departure was a division of the General Motors Corporation at this time, and this bearing could handle medium weight radial loads, possible for use in a car. The Anti Friction Bearing Manufacturers Association collected bearings for a public relations exhibit during the early 1950s, and donated them to the museum in 1977.
- Simple bearings have been used for thousands of years reducing friction on turning parts like the axles of carts. In the late 1800s and early 1900s advances in machining and production expanded bearing use in all types of machines greatly increasing their life and precision. Bearings reduce friction on turning surfaces and keep them running true. Bearings come in a variety of shapes and sizes (including ball, roller, tapered, and simple friction). Modern bearings are often set in an inner and outer ring (called a race) sometimes with cages (separators) spacing the bearings. Changes to the size, shape, alignment, race, and cage allow for bearings to be used in almost any industry—from industrial turbines and automobiles to household mixers and computer hard drives.
- Currently not on view
- Object Name
- overall: 1/2 in x 1 in; 1.27 cm x 2.54 cm
- ID Number
- accession number
- catalog number
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- Work and Industry: Mechanical and Civil Engineering
- Industry & Manufacturing
- Data Source
- National Museum of American History
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