MIL-DTL-8878L
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 references cited herein (except for related
associated MS sheets), 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 MS sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable MS sheet. In the event of any conflict between the requirements
of this specification and the MS sheet, the latter shall govern.
3.2 Qualification. The turnbuckle component parts furnished under this specification
shall be products which are authorized by the qualifying activity for listing on the applicable
3.3 Material. The material used in the manufacture of turnbuckle parts and locking clips
shall be as specified herein.
3.3.1 Turnbuckle bodies. The turnbuckle bodies shall be made of one of the following
materials.
3.3.1.1 Brass bodies. Brass turnbuckle bodies shall be made from UNS C48200 or
UNS C46400, hard tempered (H04), per ASTM B21/B21M or UNS C33000, seamless brass tubing,
per ASTM B135. The 15 percent minimum elongation value in table II of ASTM B135 is changed to
9 percent minimum. Marking by impression stamping, if used, shall be done before stress relieving.
Brass turnbuckle bodies shall be stress relieved at 450 ºF for two hours after fabrication.
3.3.1.1.1 Hardness. Finished brass turnbuckle bodies shall have a minimum hardness of
R15T-70.
3.3.1.2 Steel bodies. Steel turnbuckle bodies shall be made from UNS G86300 steel bar
per MIL-S-6070 or UNS G41300 steel bar per SAE AMS-S-6758 or UNS G41300 seamless steel
tubing per SAE AMS6360, except that the tensile strength shall be 75,000 pounds per square
inch (psi) minimum.
3.3.1.3 Aluminum bodies. Aluminum turnbuckle bodies shall be made from UNS
A92024 aluminum alloy temper T4 or T851 per SAE AMS-QQ-A-225/6 or UNS A96061
aluminum tubing material per SAE AMS-WW-T-700/3, except that heat treatment shall be T81
or T851 per SAE AMS2770.
3.3.2 Clevis and eye turnbuckle ends. Clevis and eye turnbuckle ends shall be made of
either corrosion resistant steel or carbon or alloy steel as specified. Carbon or alloy steel is
inactive for new design. Corrosion resistant steel should be used in current applications
whenever possible. The finished parts shall conform to applicable requirements of this
specification.
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