MIL-DTL-197L
stock number (NSN) (or other identification number when an NSN has not been assigned)
(see 6.2). When no quantity is specified, the lubricant shall be in accordance with the
manufacturer's standard practice. Non-stainless steel closed bearings shall have a thin coating of
compatible lubricant on outer surfaces and shall be internally greased. Plain self-lubricating
bearings shall be packaged free of oil and grease.
3.3.4.7.1 Self-lubricating bearings. Self-lubricating bearings shall be preserved dry.
Cleaning solvents, grease, or oil shall not be used.
3.4 Oxygen equipment bearings.
3.4.1 Separate clean work area for oxygen equipment bearings. A minute deposit of
hydrocarbon oil film on an oxygen equipment bearing presents an explosion hazard when
installed in the system; for this reason, a separate clean work area shall be designated for the
processing of oxygen equipment bearings. This area shall be isolated from all manufacturing
processes and shall contain only the equipment necessary to process the oxygen equipment
bearings. Workbenches, tools, and processing equipment shall be maintained free of grease, oil,
or other combustible materials and shall be used only on or for oxygen equipment. Personnel
present in this area shall maintain themselves and their clothing in a condition that will prevent
transferring contaminants to bearing surfaces.
3.4.2 Cleaning, drying, and unit preservation of oxygen equipment bearings. The
method of cleaning and drying as well as the cleanliness classification that determines the type
of inspection shall be as specified in MIL-I-52211. Cleaning and drying of oxygen equipment
bearings shall be as specified in MIL-I-52211 and 3.5. Preservation shall be method 41B and
shall include the special marking requirements of MIL-I-52211. The environment and
processing cleanliness for oxygen equipment bearings shall be the same as that described in 3.5.1
and 3.5.3.
3.4.3 Lubricants and preservative compounds for oxygen equipment bearings. The
preservative for oxygen equipment bearings shall be the operating grease. Oils and greases shall
be fluorocarbon-based only. Hydrocarbon-based oils or greases are prohibited.
3.4.4 Intimate bags for oxygen equipment bearings. Intimate bag material shall be
fluorocarbon or chlorofluorocarbon film (at least 2 mils nominal thickness) that meets the liquid
oxygen impact compatibility requirements of NASA in accordance with tests specified in
NASA-STD-6001. Closure shall be by heat sealing. Bags shall allow for re-closure and shall be
leak-proof when resealed.
3.4.5 Unit pack bags for oxygen equipment bearings. Unit pack bags shall be as
specified in 3.10.7.3.
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