MIL-DTL-197L
3.10.1.3 Self-lubricating bearings. Bearings shall be cleaned using the manufacturer's
established cleaning procedure. The use of cleaning solvents, grease, or oil is prohibited.
3.10.2 Selection of unit preservation. Unit preservation methods shall be in accordance
bearings. Unit preservation for instrument precision ball bearings shall be by method 41B. The
appropriate military methods as specified in table I shall be used for the type and size of bearings
being preserved. Bearings shall be packaged individually, in pairs, or as sets. Bearing and
bearing components that are bulk-preserved shall be as specified in 3.10.14 and the quantity for
each bulk pack shall be as specified in the contract or purchase order (see 6.2). Unit preservation
for balls and rollers shall be by method 41B or method 46B.
3.10.3 Method 20B - aluminum foil wrap. After cleaning and drying, the bearings shall
wrapped in aluminum foil. The aluminum foil shall be in accordance with QQ-A-1876 and be
0.0015 inches thick for bearings weighing up to and including 5 pounds, and 0.0020 inches thick
for bearings weighing more than 5 pounds. Bearings having a bore diameter of 3.5 inches or
greater, or weighing over 20 pounds, shall be doughnut-wrapped. Separable bearing assemblies
or cup (inner) and cone (outer) combinations that measure over 2.5 inches OD shall have
aluminum foil in accordance with QQ-A-1876 placed between each part to prevent brinelling
(see 6.5.5). Bearings thus treated shall be cooled to room temperature and hot-dipped with a
coating of strippable cellulose acetate butyrate (CAB) compound (Thermo Cote 149, Evans
Stripcoat Type II, EastmanTM CAB-500-5, or government-approved equivalent) to a minimum
thickness of 0.05 inch, and over-wrapped in a grease-proof barrier material conforming to
MIL-PRF-121, type optional. Users should evaluate strippable CAB preservative compounds to
determine suitability to their needs prior to use.
3.10.4 Method 32B - container, waterproof bag, sealed. The bearings or bearing
container (box), which in turn shall be enclosed in a sealed waterproof bag conforming to
MIL-DTL-117, type III, class B, style 1. The net weight limitation shall be 10 lbs. without a
supporting container. When A-A-3174 material is used, the net weight is restricted to five lbs.
without a supporting container. Any MIL-DTL-117 type, class, and style bag that meets or
exceeds the bag specified may be used. A protective wrap of heavy-duty kraft paper or
equivalent material (tape sealed) may be provided to protect the barrier material during handling
and storage.
3.10.5 Method 33B - greaseproof-waterproof bag, sealed. The bearings or bearing
The bearings shall be enclosed in a close-fitting sealed bag conforming to MIL-DTL-117, type
II, class C, style 1, 2, or 3. A-A-3174 material may also be used. The net weight limitation shall
be 10 lbs. without a supporting container. Any MIL-DTL-117 type, class, and style bag that
meets or exceeds the requirements may be used. Projections, sharp edges or other physical
characteristics of the item that may damage the greaseproof-waterproof barrier or container shall
be cushioned as necessary to mitigate shock and thereby prevent physical and functional damage
to the items. If a carton or box is selected as the unit container, the primary cushioning shall be
placed between the outside of the bag and the inside of the carton or box (see 3.11).
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