MIL-DTL-17901C(SH)
TABLE IV. Summary of qualification test information (class II, III, IV, and V bearings) - Continued.
Aging
No.
No.
No.
details
specimens
Tests to
Aging
specimens
specimens
Reqts.
Unit of
Test
class II,
per test
determine
time
para.
measurements
para.
per test
per test
III, IV,
class II
class III
class V
V
and IV
No separation
3
3
4.6.3
Delamination
3
3.5
into layers
Volume change
4.6.4,
Percent
(a) After water
4.6.4.1,
3
3
4.6.4.2
1 WK
3
3.6.1
increase in
immersion
4.6.4.2
volume
46
(b) After oil
4.6.4.1,
3
3
3
3.6.2
4.6.4.3
4.6.4.3
HOURS
immersion
(min.
Adhesion pull
20.0
force
LBS)
3 2/
4.6.5
3.4.1
(a) Before aging
N/A
3
2
96
(b) After oven
3 3/
4.6.5.1
3
2
3.4.2
HOURS
aging
46
(c) After oil
LB/HALF IN
4.6.5
3 3/
4.6.5.2
3
2
3.4.3
HOURS
immersion
(d) After
3 3/
seawater
4.6.5.3
3.4.4
45 DAYS
3
2
immersion
(e) After
30
3 3/
thermal
4.6.5.4
3
2
3.4.5
CYCLES
cycling
1/
A tensile and elongation test may be performed on the same specimen.
2/
Adhesion requirements for class V are listed in paragraph 3.4.6.
3/
Accelerated aging adhesion testing shall be performed and reported for class V, however, there are no minimum
requirements.
Rejection Criteria - Bearing and test specimens shall meet the requirements indicated; failure to do so shall be cause
to deny qualification.
4.3 Conformance inspection. Every bearing/stave lot shall pass a conformance inspection selected in
accordance with 4.4.4 (class III), 4.4.5 (class II and IV) and 4.4.6 (class V):
a. For stave bearings (class III) the inspection shall consist of visual inspection (see 4.5.1), a dimensional
inspection (see 4.5.2), and a hardness test (see 4.6.1) and an adhesion bond test in accordance with 4.6.5, except
aging of the specimens is not required. See Table V.
b. For cylindrical bearings (class II and IV) the inspection shall consist of a visual inspection (see 4.5.1),
a dimensional inspection (see 4.5.2), a hardness test (see 4.6.1), and adhesion bond test in accordance with 4.6.5
(class IV only), except aging of the specimens is not required. No adhesion bond test is required for class II. See
Table V.
c. For partial-arc bearings (class V) the inspection shall consist of a flexural modulus inspection (see
Table II), visual inspection (see 4.5.1), a dimensional inspection (4.5.2) and a hardness inspection (4.6.1) of each
part (e.g., a bearing half shell) in the as- manufactured condition, except aging of the specimens is not required.
Adhesion tests are required in accordance with 4.6.5 for each part.
8
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