MIL-DTL-17901C(SH)
above. Action to maintain approval of the material shall be taken on the basis of the test results. If re-qualification
test results are not received before the expiration of five years from the date of the qualification or prior re-
qualification test approval, such approval will be withdrawn, and the product removed from the Qualified Products
List.
4.2.1 Visual, dimensional, and hardness inspection. A visual, dimensional, and hardness inspection of the
bearings selected in accordance with 4.4.2 or 4.4.3, as applicable, shall be performed in accordance with 4.5.1, 4.5.2,
and 4.6.1.
4.2.2 Backing of nonmetallic staves/bearing testing (classes III, IV, and V only). The backing of
nonmetallic-backed staves/bearings shall be subjected to qualification testing. The material shall be as specified in
3.2.3, when tested in accordance with Table III.
TABLE III. Summary of qualification testing for backing of nonmetallic bearings and staves.
No. of test
Test in
Remarks
Requirements
Property
specimens
accordance with
Hardness
ASTM D2240
See Table II
See Table VI
Tensile strength
ASTM D638
See Table II
3
Yield
ASTM D638
See Table II
3
Flexural modulus
ASTM D790
See Table II
5
10 Samples tested
with Method "A" and
Impact resistance
ASTM D256
See Table II
10
a 45-degree notch
Immersed 24 hours at
See Table II
3
Water absorption
ASTM D570
75 + 5 °F
Oil absorption
4.6.4.1 and 4.6.4.3
See Table II
3
4.2.3 Synthetic rubber facing material. The synthetic rubber facing material shall be subjected to the tensile,
elongation, delamination, and volume change tests in accordance with Table IV.
4.2.4 Bearing adhesion test specimens. Bearing adhesion test strips shall be subjected to the adhesion bond
tests in accordance with Table IV. The minimum force required to strip the rubber facing from the backing at the
interface bond shall meet the requirements in accordance with Table IV. Class V bearing qualification only requires
before aging adhesion testing; aging testing of class V shall be performed and reported, however, there are no
minimum requirements.
TABLE IV. Summary of qualification test information (class II, III, IV, and V bearings).
No.
Aging
No.
No.
specimens
details
Reqts.
Unit of
Test
Tests to
Aging
specimens
specimens
per test
class II,
para.
measurements
para.
per test
determine
time
per test
class II
III, IV,
class V
class III
and IV
V
Tensile and
elongation 1/
Tensile
3
3
4.6.2
(a) Before aging
4.6.2
N/A
3
3.2.1
LB/IN2
Elongation
96
(b) After oven
3
3
4.6.2.1
3
3.2.1
4.6.2.1
percent
HOURS
aging
7
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