MIL-DTL-8878L
3.7.6 Locking clip retention. Locking clips when installed in the turnbuckle assembly
shall withstand a removal or disengagement force of 15 pounds (lbs.) when tested per 4.6.5.
3.8 Identification. Turnbuckle bodies and ends shall be marked with the manufacturer's
name or trademark and the applicable MS part number per MIL-STD-130. All turnbuckle bodies
shall be dated showing the year of manufacture by any permanent means available in
MIL-STD-130. Location of the marking shall be as indicated on the applicable MS sheet.
Where space will not permit all marking to be located in a single area, the information shall be
divided appropriately and conspicuously located in two adjacent areas. The maximum depth of
marking will be in accordance with the applicable MS sheets. On certain curved surfaces, this
depth may be exceeded to assure adequate legibility.
3.8.1 Marking. Each clip shall be coated with light blue Dykem code DMF (staining
color shall be obtained from the Dykem Company, 8501 Delport Drive, St. Louis, MO 63114),
or equal. Incomplete coverage shall not be cause for rejection. (Equivalent processes shall be
evaluated, when requested through the qualification activity.)
3.9 Workmanship. Turnbuckle parts shall be 125 root mean square (RMS) or better and
free from burrs, sharp edges, cracks, flaws, pronounced tool marks, or other discontinuities that
would prevent proper functioning or performance. Slight burrs in the thread locking area that do
not prevent gauging or interfere with installation of the terminal and locking clip are acceptable.
Discoloration resulting from heat treatment of UNS S17400 will be removed.
3.10 Penetrant inspection. Brass and aluminum turnbuckle bodies shall be fluorescent
penetrant inspected per ASTM E1417/E1417M. Any crack visible with the unaided eye shall be
cause for rejection.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Qualification test facilities. Due to the critical nature of these products and the
urgent and ongoing requirement for quality control, qualification test facilities must be readily
accessible to government personnel.
4.3 Qualification inspection.
4.3.1 Sampling instructions. Qualification test samples shall consist of four turnbuckle
assemblies containing the component part of the type and size upon which qualification is
desired. The four turnbuckle assemblies are to be distributed as specified in table II.
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