MIL-DTL-5516D
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a
conflict between the text of this document and the reference cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws
and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with AN6225. In the event of any conflict between the requirements of this
specification and AN6225, the latter shall govern.
3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection
in accordance with 4.3.
3.3 Material. The packings shall be manufactured from a synthetic rubber which is compatible
with hydraulic fluid conforming to specification MIL-PRF-5606. The synthetic rubber shall contain
no substances which will adversely affect the properties of the fluid or the packings.
3.4 Design and construction.
3.4.1 Dimensions. Dimensions and tolerances shall be as specified on AN6225 or in the contract
(see 6.2).
3.4.2 Splicing. Splicing of cured rubber shall not be used in the manufacture of the packings.
Splicing of uncured stock is allowable.
3.5 Physical properties. Physical properties of the synthetic rubber shall conform to Table I.
3.5.1 The maximum permissible variations in original physical properties during actual production
from those values established during qualification tests shall be within the limits specified in Table
II, but must stay within the limits specified in Table I.
3.6 Finish. Mold flash shall be removed from the packings in such a manner that they conform to
the requirements specified herein and on applicable standards. All surfaces of the packings shall
be reasonably free from defects, blemishes, or irregularities. Reasonable shall be defined as
allowing minor pits, raised spots, or tool marks which shall not be greater than 0.003 inch
(0.076mm) in height or depth from the packing surface.
3.7 Performance.
3.7.1 Leakage and breakout. Packings shall not exceed specified values when tested as
described in section 4. There shall be no evidence of wear, extrusion, disintegration, or
excessive permanent set.
3.7.2 Cycling. Packings shall withstand the operations specified in section 4. Leakage shall not
exceed values specified in section 4. After test, the packings shall be serviceable with no
evidence of cracking, flaking, excessive wear, or other malfunctioning.
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