MIL-DTL-197L
class 5. Bags shall allow for re-closure and shall be leak-proof when resealed. Nylon 6 bags are
moisture sensitive and all unused bags shall be stored in the clean room with temperature and
humidity controls (see 3.5.1). Once bearings are sealed within nylon 6 bags, they shall remain in
the temperature and humidity-controlled class 7 area until closure is made within the unit pack
bag (see 3.10.7.3).
3.10.7.2 Intimate bags for general purpose and precision bearings for method 41B. The
intimate bag material shall be two mils nominal thickness nylon 6 or at least four mils nominal
thickness polyethylene in accordance with A-A-3174, type I or II. When A-A-3174 material is
used, the net weight is restricted to five lbs. Transparent materials are desirable, but not
mandatory. Intimate bags for general purpose and precision bearings shall be cleaned to the
requirements of NASA JPG 5322.1, level 100. Alternate bags in accordance with
MIL-DTL-117, type I or II, class E, any style, cleaned to NASA JPG 5322.1, level 100, may be
used. Bags shall allow for re-closure and shall be leak-proof when resealed. Nylon 6 bags are
moisture sensitive and all unused bags shall be stored in the clean room with temperature and
humidity controls (see 3.6.2). Once bearings are sealed within nylon 6 bags, they shall remain in
the temperature and humidity-controlled area until closure is made within the unit pack bag
(see 3.10.7.3).
3.10.7.3 Unit pack bag for method 41B. Unit pack bags for instrument, instrument
precision, and general bearings shall be MIL-PRF-22191, type I, heat-sealable material.
Alternate bags meeting the requirements of MIL-DTL-117, type I or II, class E, any style, may
be used. Bags shall allow for re-closure and shall be leak-proof when resealed. A carton or box
shall be used to complete the unit container (see 3.11).
3.10.8 Method 44B - vials (plastic), sealed. Bearings or bearing components shall be
sealed rigid container of extruded plastic (use of PVC is prohibited) resistant to the particular
lubricant or preservative being used. The container wall thickness shall be 0.030 inch minimum
and length shall not exceed 10 inches. The size of the vial shall be such as to provide minimum
weight and cube, permitting not less than 0.010 inch play between bearings or bearing parts and
inside diameter of the vial. In filling the container, a five-percent minimum void shall be
provided to permit thermal expansion. Vials shall be initially closed by a secure leak-proof
closure. Vials shall allow for re-closure and shall be leak-proof when re-closed.
3.10.9 Method 45B - rigid metal container, sealed. The bearings, preserved, wrapped,
and cushioned as specified in 3.10.6, shall be snugly enclosed in a sealed rigid metal container.
Any selected type of rigid metal container listed in PPP-C-96 may be used if the container meets
one of the test requirements of method 5009 in MIL-STD-3010. When specified in the contract
or purchase order, the metal container may be vacuum sealed (see 6.2).
3.10.10 Method 46B - vials (plastic), sealed. After cleaning and drying, the bearings,
balls, or rollers shall be coated as specified in 3.3.4.7. Bearings or balls shall be separated by
nylon 6 spacers or tightly wrapped with nylon 6 material. Wraps shall be made secure either by
heat sealing or folding, followed by insertion into vials specified in 3.10.8. Each vial shall have
been cleaned with a blast of dry nitrogen, by vacuum, or solvent-washed before inserting the
contents. Additional dunnage of nylon 6 shall be used when necessary to prevent movement of
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