A-A-50602
2.3 Axial static limit load. For spherical bearings, the axial static limit load shall not be less than 6,000 pounds. Permanent set shall be less than 0.005 inch.
2.4 Self-alignment requirement. Spherical bearings shall be self-aligning and shall permit at least 3 degrees angular misalignment.
2.5 Friction. The coefficient of friction of a journal bearing preloaded to 5000 psi shall be not more than 0.13.
2.6 Wear. Total wear for any one sample shall not exceed 0.005 inch following testing LAW (see 4.6).
2.7 Water absorption. After submersion is salt water (see 4.7), weight gain shall be not more than 1.5 percent, and swell shall be more than 0.5 percent.
2.8 Linear peelability and bond integrity. After completion of water absorption testing, the same samples shall be tested for liner peelability and bond integrity. The liner shall be evaluated as per MIL-B-81934. The liner shall be tightly adhered to the backing over at least 90 percent of the contact area and shall exhibit an average peel strength of not less than 2.0 pounds per inch for fabric type liners. The remaining adhesive on the backing after peeling the liner shall have no voids with diameters larger than 25 percent of the race width or 0.25 inch whichever is smaller. In the event the liner cannot be removed without employing chipping scraping or abrasive techniques, the liner shall be considered to be properly bonded and free of voids and shall be classed as non-peelable. Not applicable for bearings constructed per 2.1.1(b).
2.9 Creep. Bearing shall be loaded per 4.6 and held at 25,000 psi for 1000 hours and shall have a total permanent set over that period not greater than 0.003 inch.
2.10 Shock. The bearing material will pass applicable shock requirements by successfully completing the radial static load test.
3. Contractor certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of the Commercial Item Description and that the product conforms to the producer’s own drawings, specifications, standards, and quality assurance practices. The Government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provision of the contract.
4. Quality assurance provisions. Unless otherwise specified, to determine compliance with the requirements of the salient characteristics section perform the following tests on candidate bearings. Journal bearings should be
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