MIL-DTL-197L
6.5.11 Instrument precision bearings. Instrument precision bearings are ball bearings with
outside diameters not over 30 mm or 1.1811 inches and ABEC tolerances of ABEC 5P, 5T, or
better.
6.5.12 Large bearings. Large bearings are those bearings exceeding 16 inches outside
diameter or greater than 10 pounds in weight.
6.5.13 Open race bearings. Open race bearings are those having a single seal, or shield, or
those having no seals or shields, or those that are separable.
6.5.14 Operational lubricant. The lubricant identified by specification, standard, or
contract applied as a protective film to provide lubrication to a bearing that is installed and in
service. Operational lubricants may also be specified as preservative lubricants (see table II,
6.5.15 Oxygen equipment bearings. Oxygen equipment bearings are those bearings used
in gaseous or liquid oxygen systems and high-pressure, submersible, life support systems. They
must be free from combustible materials, lubricants, or debris.
6.5.16 Precision bearings. Precision bearings are bearings manufactured to, or better than,
the following ABMA tolerances:
a. ABEC 3 and RBEC 3 for metric ball and roller bearings.
b. ABEC 5T for torque tube and extra thin type bearings.
c. Class 3 for inch-tapered roller bearings.
6.5.17 Preservation (unit protection). Preservation (unit protection) is the application of
protective measures, barrier materials, cushioning, and containers when necessary. Preservation is
the process and procedures used to protect material from deterioration and damage. It includes
cleaning, drying, preserving, packing, marking, and unitization.
6.5.18 Preservative. A compound identified by specification, standard, or contract applied
as a protective film on a bearing that is packaged, in storage, or in transit. Preservative compounds
are not lubricants; bearings preserved in preservative compound will require cleaning and
6.5.19 Preservative lubricant. A lubricant identified by specification, standard, or contract
applied as a protective film on a bearing that is packaged, in storage, or in transit. Preservative
lubricants may be the same as, or differ from, operational lubricants. If different, preservative
lubricants will be cleaned from the bearing, and the bearing will be lubricated with its operational
6.5.20 Roller Bearing Engineers Committee (RBEC). The class or degree of precision of
radial roller bearings (see ABMA 20).
6.5.21 Self-lubricating. A bearing with a self-lubricating liner such as TeflonŽ or a
powder metallurgy (sintered) bearing that has been permanently impregnated with a lubricating
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