MIL-DTL-5513D
4.7.6 Endurance (see 3.4.5). Swivel joints shall be subjected to endurance testing and shall meet the
requirements of 3.4.5. The swivel joint shall be subject to 100,000 swivel cycles at a rate of 25 ± 4 cycles
per minute (see figure 1 for a typical endurance test set-up). The following details shall apply:
a. Each half cycle for plane swivels shall consist of a minimum of 120° rotation. For angular
misalignment swivel joints, each half cycle shall consist of a minimum of 120° rotation and at
the same time shall transcribe a conical motion of 120° (see figure 2).
b. The conical motion is the result of a swivel joint being constantly misaligned 90 percent of its
rated misalignment feature.
c. During swivel cycling, the swivel joint shall be impulse at a rate of 35 ± 5 cycles per minute (see
figure 3).
d. During the first sequence of 10,000 swivel cycles, the swivel joint shall be serviced with test
fluid maintained at elevated temperatures as specified in table VIII for the respective swivel joint
types.
e. During swivel cycling, the joints shall also be subjected to the eccentric loading conditions in
f. After each 10,000 swivel cycles, reverse the direction of the load.
g. The swivel shall be serviced with test fluid at 5 to 10 psig (35 to 69 KPa) and the fluid
temperature shall be maintained at the elevated temperature specified in table VIII for the
respective joint type. The following schedule of tests shall be repeated five times:
1. 10,000 swivel/impulse cycles with eccentric loading.
2. Blowing dust test in accordance with MIL-STD-810, method 510.1, procedure I, the
following details shall apply:
(a) The first two schedule runs shall use MIL-STD-810, method 510.1, procedure I, steps
1 through 5 and 8 through 11 the following details shall apply:
(1) Temperature. 23°C (73°F).
(2) Humidity less than 22 percent.
(3) Dust composition shall be silica flour.
(b) The third schedule run shall use the entire MIL-STD-810, method 510.1, procedure I,
dust composition shall be silica flour.
(c) The fourth and fifth schedule runs shall use MIL-STD-810, method 510.1, procedure I,
steps 1 through 5 and 8 through 11 the following details shall apply:
(1) Temperature. 71°C (160°F).
(2) Humidity less than 22 percent.
(3) Dust composition shall be silica flour.
3. 10,000 swivel/impulse cycles with eccentric loading.
4. Icing see 4.7.6.2.
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