MIL-DTL-197L
3.5 Instrument and instrument precision ball bearings.
3.5.1 Environment and process cleanliness of cleaning and drying areas. Cleaning and
drying areas are defined as those areas in which bearings are subjected to the cleaning and drying
processes. Requirements for class 7 of ISO 14644-1 and ISO 14644-2 for particle count shall be
met (see 4.5). The temperature shall be maintained at 73 ±5 °F (24 ±3 °C) with a maximum
relative humidity (R.H.) of 45 percent.
3.5.2 Cleaning and drying of open non-lubricated instrument and instrument precision
ball bearings. The bearings shall be cleaned and dried by any process or processes that are not
injurious to the item (see 3.3.3). The use of chlorinated or fluorinated solvents, acetone, aqueous
washes, and other suitable non-ozone-depleting solvents is permitted. Solutions used to clean
barrier-film-coated bearings shall be stored separate from solutions used to clean non-barrier-
film-coated bearings. A barrier-film-coated bearing shall not be processed through the regular
bearing cleaning area. Procedures for packaging barrier coated bearings are specified in
MIL-STD-1334 and these procedures shall be followed. Bearings shall be thoroughly dried prior
to lubrication and intimate wrapping.
3.5.3 Preservation and unit packaging area environment and process. The working area
shall be well illuminated and air-conditioned. Requirements for class 7 of ISO 14644-1 and
are dry, they shall be preserved, lubricated, and intimate-packaged in a continuous process
within a class 5 environment in accordance with ISO 14644-1 and ISO 14644-2. Any transfer
out of the class 5 environment after the preservation process has begun shall require that the
bearings be placed in clean, dust-excluding containers. The unit packaging area, or secondary
bagging, shall be well illuminated, clean, dry, and in an air-conditioned environment. The
presence of dust and dirt-producing sources shall be kept to a minimum. When bearings have
been intimate wrapped in nylon 6 material, they shall remain in the controlled environment
described in 3.5.1 until the bearings are enclosed within the unit pack bag.
3.5.4 Method 40B preservation area environment, cleaning and drying areas, and process
controls. Working area environment and process control for method 40B bearings shall conform
3.6 General purpose and precision bearings.
3.6.1 Environment and process cleanliness of cleaning and drying areas. The presence
of dust and dirt-producing sources, such as cartons or trash barrels, shall be kept to a minimum.
Smoking, eating, and drinking shall not be permitted in the cleaning and drying areas. Cleaning
and drying areas are defined as those areas within a 10-foot radius of the cleaning and drying
equipment, including aisles.
3.6.2 Preservation and unit packaging area environment and process control. The
working area shall be well illuminated. Requirements for class 8 of ISO 14644-1 and
ISO 14644-2 shall be met for the preserving, intimate bagging, or intimate wrapping processes
(see 4.5). The temperature shall be maintained at 73 ±5 °F (24 ±3 °C) with a maximum R.H. of
45 percent. Area control shall be in accordance with 3.6.1. Bearings shall be preserved and
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