MIL-DTL-197L
then be returned to stock with a shelf life re-certification date marked clearly on the new
packaging.
6.5 Definitions.
6.5.1 Annular Bearing Engineers Committee (ABEC). The class or degree of precision of
ball bearings. See ABMA Standard 20, "Radial Bearings of Ball, Cylindrical Roller and Spherical
Roller Types Metric Design"; ABMA Standard 12.1, "Instrument Ball Bearings Metric Design";
and ABMA Standard 12.2, "Instrument Ball Bearings Inch Design".
6.5.2 ABMA. American Bearing Manufacturers Association.
6.5.3 Barrier coating. A fluoropolymer or other coating applied to selected surfaces of
open race bearings to prevent migration of lubricating oil from the bearing by rendering selected
bearing surfaces unwettable to oil. Barrier coatings keep a metered amount of oil lubricant inside
6.5.5 Brinelling. Damage to a bearing in which metal is deformed without removal in the
bearing race after the bearing has been subjected to prolonged or excessive load (as when
dropped). Brinelling may be observed as a series of dents, or "peens", along the inner surface of a
bearing's race where contacted by the rollers or balls. "False brinelling" occurs when an abrasive
contaminant is introduced between the rollers/balls and the race and the bearing is subjected to
vibration, resulting in polished areas that resemble brinelling, but do not deform the race surface.
6.5.6 Closed race bearings. Closed race bearings are those having either seals, shields,
bands, or retainment plates, or other devices completely closing both sides of bearings, or a single
contact seal on one side only, rendering cleaning and re-lubrication difficult.
6.5.7 General purpose bearings. General purpose bearings are bearings which fall into the
following tolerance classification: Tolerances coinciding with those of unground bearings up to
and including the ABMA tolerances of ABEC 1 or RBEC 1.
6.5.8 Intimate bag or wrap. The inner bag or wrap used directly against the bearing or
bearing component.
6.5.9 Installation life. The time, from initial lubrication, preservation, and packaging of a
closed race bearing, to a time in the future that the bearing can be estimated to be installable
without issue, based on the type of lubricant or preservative used. Installation life is determined
by the manufacturer or overriding industry standard (see 3.3.4.4.1).
6.5.10 Instrument bearings. Instrument bearings are ball bearings with outside diameter
not over 30 mm or 1.1811 inches and an ABEC tolerance of ABEC 3 or better.
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