F-F-351D
April 22, 1983
SUPERSEDING
F-F-351C
May 25, 1966
FEDERAL SPECIFICATION
FILTERS AND FILTER ELEMENTS, FLUID
PRESSURE: LUBRICATING OIL,
BYPASS AND FULL FLOW
This specification was approved by the Assistant Administrator,
Office of Federal Supply and Services, General Services Admin-
istration, for the use of all Federal agencies.
1. SCOPE AND CLASSIFICATION
1.1 Scope. This specification covers oil filters and oil filter elements of
bypass design; and also oil filters and oil filter elements of the outside-to-
inside flow-path type of full-flow design for installation on internal combustion
engines to remove contaminants from lubricating oil (see 6.l).
1.2 Classification. Oil filters and oil filter elements shall be of the
following types, classes, and styles, as specified (see 6.2):
Type I - Oil filters (with elements), bypass design.
Class 1 - Light duty, regular size.
Style A - With replaceable element.
Style B - Throw-away design.
Class 2 - Heavy duty, junior size.
Class 3 - Heavy duty, senior size.
Type II - Oil filter elements (bypass design).
Class 1 - Light duty, regular size.
Class 2 - Heavy duty, junior size.
Class 3 - Heavy duty, senior size.
Type III - Oil filters (with elements), full-flow, throw
away design.
Type IV - Oil filter elements, full-flow design.
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