MIL-DTL-197L
the bearings, balls, or rollers within the vial. The vial closure seal shall provide a water vapor
transmission rate equal to the vial material. Vials shall allow for re-closure and shall be leak
proof when re-closed.
3.10.11 Method 49B - greaseproof spiral wrap, hot wax coating. After cleaning and
drying, bearings shall be dip-preserved or lubricated with the bearing operating fluid. The
bearings shall be wrapped in a greaseproof spiral inner wrap and over-wrapped with self-
adhering greaseproof spiral wrap. The external surface of the over-wrap shall be coated with hot
wax. The unit shall be cushioned and unit packaged in a container of fiberboard or wood
(see 3.11).
3.10.11.1 Intimate wrapping of large bearings either 16 inches outside diameter or
greater than 10 pounds for method 49B. The bearing shall be wrapped with an intimate wrap of
material in accordance with MIL-PRF-121, type I or II (greaseproof), and shall be wound in a
spiral fashion from inside diameter to outside diameter to inside diameter. An over-wrap of
material in accordance with MIL-PRF-121, type I or II, shall be applied in a spiral fashion and in
the opposite direction of the intimate wrap. Hot wax shall be applied to the entire surface of the
wrapped bearing. The hot wax shall be applied with a brush to form a seal as water-vaporproof
and waterproof as possible. Method 41B is an acceptable alternative to method 49B, however;
the intimate wrap bag shall be at least four mils nominal thickness (type, spun bonded
polyolefin); and the unit pack bag shall be MIL-DTL-117, type I, heavy duty.
3.10.12 Method 52B - container, water-vaporproof bag, sealed container. The bearings
requirements of method 50 of MIL-STD-2073-1. The bearings shall also be wrapped and
enclosed in a close-fitting box conforming to PPP-B-566 or PPP-B-676. The box shall be
desiccated with activated desiccant conforming to MIL-D-3464, type I. The quantity of
desiccant shall be determined in accordance with section 5 of MIL-STD-2073-1. The desiccant
shall not be permitted to come in direct contact with critical surfaces of the bearings. The
desiccant shall be located as to not be load-carrying. The box shall be enclosed in a heat-sealed
bag conforming to MIL-DTL-117, type I or II, class E, style 1, 2, or 3. A-A-3174 material may
also be used. The sealed bags shall be enclosed in an outer container conforming to
ASTM D5118/D5118M or ASTM D5168, as applicable. Closure of the container shall be in
accordance with ASTM D1974/D1974M.
3.10.13 Method 54B - rigid container, non-metallic, sealed. Bearings or bearing
3.1 and comply with the requirements of method 50 of MIL-STD-2073-1. Bearings not
exceeding 20 pounds, preserved, wrapped, cushioned, and desiccated as required in 3.10.14,
shall be enclosed in a sealed, close-fitting, rigid, non-metallic container. When a greaseproof
liner is required, liner material shall conform to MIL-L-45973. For heavier items, fiber
containers conforming to PPP-D-723, type III, grade A, class 2, may be used. Sealed, rigid, non-
metallic containers may be used if the container meets one of the test requirements of method
5009 in MIL-STD-3010. The container may be vacuum sealed.
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