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|  MIL-P-21343(SHIPS)
3.3.7.3 All thrust bearing housings shall be so designed that the bearings will be adequately lubri-
cated immediately when the shaft starts to turn. This shall be accomplished by adequate sealing of the
bearing housings so that, regardless of the length of time the units are idle, an adequate supply of lubri-
cant will remain in the bearing housings.
3.3.8 Threaded parts such as bolts, studs and nuts shall conform to Handbook H28.
3.3.8.1 Fine threads may be used for the set ends of studs and in the nut end in cases where
special double width cap nuts are proposed any open type hexagonal head nuts shall be of standard size and
shall have coarse threads. Nickel-copper locking wire shall be supplied for any threaded parts not
readily accessible such as line bearing retainers and end covers.
3.3.9 Welding shall be in accordance with Standard MIL-STD-278.
3.4 Materials. -
3.4.1 All material used in the construction of the pumps and associated equipment shall be of the
quality best suited for the purpose intended, and shall be strictly in accordance with the material specifi-
cations.
3.4.2 The use of materials differing in properties from those specified for a given application will
be considered when the contractor shows the necessity for such substitution, the material proposed is
readily obtainable, and provided that the material is satisfactory to the bureau or agency concerned.
3.4.3 Where no specifications are specified herein for the material for certain parts, the material
used shall be of a type and quality consistent with that specified for associated parts in the pump. The
use or substitution of manufacturer's material shall be subject to approval by the bureau or agency con-
cerned and shall be clearly indicated in a list submitted with the master drawings.
3.4.4 Materials for the pumps shall be in accordance with table I.
Table I - Materials
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