MIL-DTL-8878L
3.3.2.1 Corrosion resistant ends. Corrosion resistant steel clevis and eye turnbuckle ends
shall be forged or machined from UNS S17400 in the H1150 condition per SAE AMS5643 or in
the H1150 or H1150M condition per ASTM A564/A564A.
3.3.2.2 Carbon or alloy steel ends. Carbon or alloy steel turnbuckle ends are inactive for
new design and not preferred. Corrosion resistant steel should be used when possible. Carbon or
alloy steel clevis and eye turnbuckle ends shall be made of UNS G41300 steel per SAE AMS-S-
6758. Ends not fabricated from heat treated material shall be heat treated per SAE AMS-H-6875
to conform to this specification and the applicable MS sheet.
3.3.3 Locking clip. The locking clip shall be made of corrosion-resisting steel wire,
composition UNS S30200 or UNS S30400 per ASTM A313/A313M.
3.4 Construction. The construction of turnbuckle components shall be as specified
herein and on MS21251, MS21252, MS21253, MS21254, MS21255, and MS21256.
3.4.1 Turnbuckle body and ends. Turnbuckle body and ends shall contain facilities for
employing a locking clip that will provide positive safetying of mating parts in assembly.
3.4.1.1 Positive safetying. Positive safetying, for purpose of this specification, is defined
as preventing rotational movement between turnbuckle body and end within the requirements of
this specification without structural failure of the components or locking clip.
3.4.2 Locking clip. The locking clip shall be constructed as specified herein and on
MS21256. It shall be capable of being installed manually without the use of tools and shall be
self-retaining in assembly.
3.5 Protective treatment. Steel and aluminum parts shall be treated for corrosion
protection as specified.
3.5.1 Steel parts.
3.5.1.1 Carbon and alloy steel. Carbon and alloy steel turnbuckle parts shall be cadmium
plated per type II, class 2, of SAE AMS-QQ-P-416.
3.5.1.1.1 Bore of carbon and alloy steel parts. The bore of carbon and alloy steel parts shall
be coated with corrosion preventive compound conforming to grade 1 of MIL-PRF-16173.
3.5.1.2 UNS S17400 steel. After removal of all oil and grease, terminals shall be treated
by one of the following methods:
a. Nitric passivation per ASTM A967/A967M, Nitric 3 method or SAE AMS2700, Method 1,
type 7.
b. Nitric passivation per ASTM A967/A967M, Nitric 1 method or SAE AMS2700, Method 1,
type 2
c. Citric passivation per ASTM A967/A967M, Citric 1, 2 or 3 method or SAE AMS2700,
Method 2.
d. Glass bead peening per SAE AMS2430.
The method of treatment is at the manufacturer's option unless specified in the contract (See 6.2.e).
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