MIL-DTL-26894D
3.3.1.1 Tube. The tube shall be made from a synthetic rubber compound resistant to
high aromatic aviation fuel. The thickness of the tube shall be not less than 0.094 inch and its
diameter shall be uniform to within ±0.031 inch. The bore of the tube shall be smooth, free
from pitting, cuttings, borings or cements.
3.3.1.2 Reinforcement. The reinforcement shall be evenly and firmly braided, loomed, or
plied. It shall be free from defects, dirt, knots, lumps, and irregular twisting.
3.3.1.3 Helix wire. The helix of round wire, made from steel free of corrosion, shall be
embedded in synthetic rubber between reinforcing members. The diameter of the wire shall be
not less than 0.078 in. Its tensile strength shall be not less than 180,000 psi. The wire shall
extend at least to under the middle coupling strap.
3.3.1.4 Cover. The cover shall be constructed of compounded polychloroprene rubber
and shall be abrasion resistant (see 3.4.3). It shall be smooth, free from pitting, and shall have
a uniform thickness of not less than 0.063 inch.
3.3.2 Couplings. Unless otherwise specified, couplings shall not be provided. When
couplings are required, they shall be non-reattachable, threaded (see 3.3.2.2) and of the male
or female type as specified by the procuring activity (see 6.2). The bore shall be smooth. The
female coupling nut shall swivel freely by hand. An appropriate gasket shall be used to ensure
that the nut is leaktight. The shank of the body shall have a rounded outer edge to prevent
cutting of the hose during installation or from sharp bending during usage. The body shall be
securely attached to the hose. There shall be no protruding clamps or fasteners. If a sleeve
is used, the sleeve shall extend beyond the end of the body when installed. If straps are used,
the body shank shall have a length of not less than 5 inches, and the number of barbs
separated by a strap shall be not less than two.
3.3.2.1 Coupling chemical composition. If supplied, the body, nut and sleeve shall be a
300 series stainless steel conforming to QQ-S-763, passivated in accordance with ASTM-
A967, or high grade brass whose composition shall contain no less than 58 percent copper.
MIL-A-8625 anodized high tensile strength aluminum, type 354 casting alloy conforming to
MIL-A-21180 or aluminum alloy wrought of other than the 2000, 4000 and 7000 series may
also be used. If used, the grip wire shall be corrosion resistant steel or carbon steel. Grip wire
of carbon steel shall be protected against corrosion by either cadmium plating in accordance
with QQ-P-416, type II, class 2 or by any other equivalent method that meets the corrosion
resistance requirement of QQ-P-416. If straps are utilized, they shall be of a 300 series
stainless steel conforming to QQ-S-763, passivated in accordance with ASTM-A967. If
gaskets are provided, they shall be of rubber conforming to MIL-R-6855.
3.3.2.2 Coupling threads. Both the male and female type couplings shall be threaded
with 4-inch American National pipe threads.
3.3.2.3 Coupling caps. Each coupling shall be provided with a protective closed-end,
reusable, threaded, metal cap. The thickness of the cap shall be not greater than 0.031 inch
and not less than 0.025 inch. The cap shall not be chemically affected by the corrosion-
preventive compound conforming to class 1 of MIL-C-11796.
3.4 Performance.
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business