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|  MIL-F-5577B
a compound, approved by the procuring activ-
value varying by more than + 3 inch-pounds.
ity, to prevent the cover fittings from cohering
Locking devices of the prevailing torque type
to their frames.
shall, in addition to the above requirements,
3.16.2 Style 2. The fittings shall be buffed
be within the applicable values of table II.
and cured to the extent specified by the tank
3,10.4.3 Inserts. Bolts or inserts incorpo-
manufacturer. In addition, access-door cover
rating self-locking devices shall, in addition to
fittings shall be treated with a compound, ap-
meeting the above requirements, meet the ap-
proved by the procuring activity, to prevent the
plicable requirements of 3,10.1, 3.10.2, and
cover fittings from cohering to their frames.
3.10.3.
3.17 Manufacturer's drawings. Manufac-
3.10.5 Replacement. Inserts shall be so fab-
turer's detailed drawings shall be submitted to
ricated that it will be practicable, in the event
the procuring activity for approval prior to
of damaged insert threads, to replace the
starting the construction of fittings to be sub-
threaded portion of the insert or the entire
mitted for Preproduction testing. The re-
insert. This repair shall not reduce the seal-
quirements of the approved manufacturer's
ing-surface area, change the thread size, or,
drawings or of the procuring activity's draw-
when applicable, affect the self-locking charac-
ings are applicable as requirements of this
teristics.
specification.
3.11 Screw threads. Screw threads shall
3.18 Marking.
conform to Specification MILS-7742, class
3.18.1 MS part number. The MS part num-
UNF-2B, or 3B. This requirement is not ap-
ber and the type of fittings shall be legibly
plicable to the locking portion of self-locking
molded or stamped in characters at least 0.12
inserts.
inch high in the surface of the fittings in the
3.12 Bolt size, Bolts utilized in Wings
position shown on the applicable MS standard.
shall be no smaller than -28.
3.18.2 Identification of product. The fit-
3.13 Studs. The use of studs shall not be
tings shall be marked for identification in ac-
allowed on multibolt fittings.
cordance with Standard MIL-STD-13O. Style
3.14 Interchangeability. All fittings hav-
I fittings shall include the date of manufacture.
ing the same manufacturer's part number shall
3.18.3 Handhole covers and access doors.
be directly and completely interchangeable
The exterior surface of all covers shall be dur-
with each other with respect to installation and
ably and legibly marked "OUTSIDE."
performance. All fittings bearing different
4. QUALITY
ASSURANCE
PROVI-
manufacturer's part numbers, but manufact-
SIONS
ured to the same MS standard shall be di-
4.1 Unless otherwise specified herein, the
rectly and completely interchangeable with
supplier is responsible for the performance of
each other with respect to installation and per-
all inspection requirements prior to submission
formance, and shall be suitably marked with
for Government inspection and acceptance.
the applicable MS part number. Unless other-
Except as otherwise specified, the supplier may
wise specified by the procuring activity,
utilize his own facilities or any commercial
changes in manufacturers' part numbers shall
laboratory acceptable to the Government. In-
be governed by the drawing number require-
spection records of the examinations and tests
ments of Specification MIL-D-5028.
shall be kept complete and available to the
3.15 Performance. The fittings shall be
Government as specified in the contract or
satisfactory when subjected to the applicable
order.
tests of section 4. (See 4.5.3.)
4.1.1 Classification of tests. The inspec-
tion and testing of fittings shall be classified as
3.16 Finish and condition of cure.
follows:
3.16.1 Style 1. The fittings shall be buffed
(a) Preproduction tests: (See 4.2.)
and suitable for installation in tanks in the
(b) Acceptance tests: (See 4.3.)
field without any further cure. In addition,
4.2 Preproduction testing.
access-door cover fittings shall be treated with
6
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