MIL-STD-1647E
SAE-AMS6447 Steel Bars, Forgings, and Tubing 1.4CR (0.98 - 1.10C) (SAE 52100) Electroslag Remelted. (DoD adopted)
(Application for copies should be addressed to the Society of Automotive Engineers
(SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001 or https://www.sae.org)
2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. DEFINITIONS
3.1 Miniature and instrument type annular ball bearings. For purposes of this document, any reference to "bearings" or "ball bearings" will mean miniature and instrument type annular ball bearings, ABEC 1 tolerance or better and 30mm outer diameter (OD) (1.1811 inch) and smaller.
3.2 Domestic manufacture. Domestically manufactured ball bearings are those which are assembled in the United States or Canada. When a ball bearing is involved, all components
of the assembly must also have been manufactured in the United States or Canada.
3.3 Made in USA Made in USA refers to ball bearings and components of ball bearings completely manufactured, assembled and tested within the United States of America.
3.4 Basic bearing part number. The basic bearing part number refers to the group of numbers or letters in a manufacturer's part number which specifies the bore, outside diameter, width, material and the number of shields or seals used.
3.5 Chrome steel 52100. Chrome steel is defined under the following specifications: ASTM-A295, SAE-AMS6440, 6444, 6447.
3.6 Stainless steel 440C. Stainless steel is defined under the following specifications: SAE-AMS5618, 5630, 5880.
4. GENERAL REQUIREMENTS
4.1 Identification. All bearings used in any DoD contract, or bearings supplied for the repair of a DoD contract item shall be marked in accordance with one of the methods in Detailed Requirements.
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