MIL-DTL-8878L
3.5.2 Aluminum parts. Aluminum alloy shall be anodized per MIL-A-8625, type II,
class 1.
3.6 Dimensions. The dimensions of turnbuckle bodies, turnbuckle ends, and the locking
clip shall conform to those specified on the applicable MS sheet.
3.6.1 Threads. The internal threads in the turnbuckle bodies shall conform to
ASME B1.1 UNF-3B. Concentricity between tap hole and threads shall be such that the locking
clips can be installed with the terminals engaged to the cross hole for all locking slots (see 4.6.5.1).
3.7 Physical properties.
3.7.1 Rotational movement. The total angular clockwise and counterclockwise rotational
movement between turnbuckle body and turnbuckle end with locking clip installed shall not
exceed that specified in table I when subjected to 10 percent of the specified torsion load (see
4.6.1).
TABLE I. Torsion test loads and rotational movement.
MS sheet
Minimum torque
10% of torsion load
Rotation movement
dash number
(in-lbs)
(in-lbs)
(maximum degrees)
2
8
0.8
15
3
26
2.6
11
4
82
8.2
8
5
82
8.2
8
6
163
16.3
7
7
318
31.8
6
8
318
31.8
6
9
523
52.3
5
10
750
75.0
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3.7.2 Torsion. Turnbuckle bodies and ends shall be capable of withstanding the torsional
loads specified in table I, applied clockwise and counterclockwise direction without permanent
deformation when tested per 4.6.2.
3.7.3 Tensile fatigue. Turnbuckle bodies and ends shall be capable of withstanding a
load equal to 60 percent of the minimum breaking strength (MBS) specified on the applicable
MS sheet, applied repeatedly in tension at a rate of approximately one cycle per second for 300
applications without failure, deformation, or permanent increase in overall length of any
component part in excess of 0.001 inch per inch in the direction of the application of load
(see 4.6.3).
3.7.4 Breaking strength. The MBS of turnbuckle parts shall not be less than the values
specified on the applicable MS sheet (see 4.6.4).
3.7.5 Bending. Turnbuckle ends shall withstand bending through an angle of 90 degrees
without cracking or fracture. Locking clip formed radii shall withstand straightening so that the
test sample becomes approximately a straight length of wire (see 4.6.6).
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