MIL-DTL-17901C(SH)
3.4.3 Adhesion after oil immersion. The adhesion of the rubber facing material to the backing for each strip
after oil immersion for 46 hours in accordance with 4.6.5.2 shall have a minimum value not less than 20.0 pounds
when tested in accordance with 4.6.5.
3.4.4 Adhesion after seawater immersion. The adhesion of the rubber facing material to the backing for each
strip shall be tested after immersion in seawater for 45 days and shall have a minimum value not less than 20.0
pounds when prepared in accordance with 4.6.5.3 and tested in accordance with 4.6.5.
3.4.5 Adhesion after thermal cycling. The adhesion of the rubber facing material to the backing for each strip,
after thermal cycling in accordance with 4.6.5.4 shall have a minimum value not less than 20.0 pounds when tested
in accordance with 4.6.5.
3.4.6 Adhesion requirements for class V bearings. The following criteria shall be used to determine the
acceptance of adhesive bond for class V bearings when tested in accordance with 4.6.5.
a.
A minimum time-average value of 20 pounds or greater for a test strip is acceptable.
b. If any test strip yields a time-average value less than 20 pounds but greater than 16 pounds, then all test
strip values for the part (up to three values) shall be averaged. The adhesion test results shall be considered
acceptable if the calculated average of the test values for the part is 20 pounds or greater. At any time during an
individual pull, any value of zero shall be considered to have failed the specification requirements, except for rubber
breakage.
c. If any test strip yields a time-average test value less than 16 pounds, the specimen shall be considered
to have failed the specification requirements.
3.5 Delamination. Rubber material shall show no evidence of separation into distinct layers of laminations
when prepared and tested in accordance with 4.6.3.
3.6 Volume change.
3.6.1 Volume change after water immersion. When immersed in water, the volume of the rubber facing
specimen and non-metallic backing specimen shall not increase more than 5 percent when tested in accordance with
4.6.4.1 and 4.6.4.2. No shrinkage shall be permitted.
3.6.2 Volume change after oil immersion. When immersed in oil as specified in 4.6.4.3, the volume of the
rubber facing specimen and non-metallic specimen shall not increase more than 5 percent when tested in accordance
with 4.6.4.1. No shrinkage shall be permitted.
3.7 Performance. The rubber material shall pass the performance test for wear, friction, and vibration
characteristics in accordance with 4.6.6.
3.8 Interchangeability. Bearings of the same class, type, and size shall be interchangeable both physically and
functionally. If the design is symmetric, they shall be reversible. (Flanged bearings are not symmetric.)
3.9 Storage. Storage requirements shall be as specified (see 6.2). For shelf-life guidance, see 6.5. ISO 2230
shall be used as guidance for storage requirements.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 Qualification. Bearings shall pass initial qualification inspection and tests in accordance with 4.2.1, 4.2.2,
4.2.3, 4.2.4, 4.6.6 and Tables III and IV, except class II, class IV, and class V bearings do not require friction testing.
Selection of sample bearings and the preparation of test specimens shall be in accordance with 4.4.2, 4.4.3, 4.6.6.1.1,
and 4.6.6.2.1, as applicable. Once qualified, any changes to bearing stave manufacturing processes or materials or
procedures require re-qualification. The manufacturing process, procedure, and materials (including inspections and
test methodology) used for qualification test articles shall be used for all bearing production runs. Bearings that
have been qualified require re-qualification at 5-year intervals. Re-qualification test shall consist of the same tests
6
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business