MIL-STD-1647E
5. DETAILED REQUIREMENTS
5.1 Literal (non-symbolic) identification. Bearings (miniature, instrument and instrument precision) having an adequate width on either the inner or the outer ring face shall be marked in accordance with MIL-STD-130. In addition, the bearing shall be marked "Made in USA" or "USA", or "Made in Canada" or "Canada". The use of symbolic marking may be used in addition to MIL-STD-130 marking.
5.2 Symbolic marking. Symbolic marking shall be used when the bearing is too small to place the literal markings required by MIL-STD-130 on the ring faces. The applicable symbolic marking illustrated on figure 1 shall be marked on the inner or outer ring face of bearings, ABEC 1 or better 30mm/1.1811 inch OD or less. Symbolic markings shall fully
identify the manufacturer of the bearing and the material used in its manufacture (440C stainless steel or 52100 chrome steel).
5.3 Indirect marking. Bearings having an inadequate face width for the symbolic markings (see figure 1) shall be exempt from the marking requirements of 5.2. The unit packages of such bearings shall be marked in accordance with MIL-STD-129.
5.4 Barrier coated bearing marking. In addition to the requirements of 5.1 and 5.2, barrier coated bearings shall be marked in accordance with SAE-AS13341. Such markings shall be accomplished prior to barrier coating of the bearing.
5.5 Duplex bearing marking. Duplex bearings shall be marked in accordance with the requirements of 5.1 to 5.3 and MIL-B-913, MIL-B-81793, FF-B-171 and FF-B-2844. In
addition, bearings furnished as duplex pairs shall be marked to identify their relative position to each other in the assembly. Instructions shall be included with duplex bearings to identify such markings.
5.6 Source and specification control bearing marking. These bearings shall be marked in accordance with the requirements specified in 5.1 through 5.5. The packaging of these bearings shall be in accordance with MIL-STD-129.
5.7 Exemptions from marking requirements. Bearings made of materials other than
440C and 52100 steels, bearings of configuration other than conventional radial or angular contact type, and bearings where marking is specifically prohibited by the Government shall be exempt from all marking requirements of this standard. Such bearings shall be marked as specified in the applicable contract.
5.8 Certification of symbolic markings. All bearing manufacturers using symbolic markings shall furnish a notarized certification that the symbolic markings shall have the same meaning as the words "Made in USA", "USA", or "Made in Canada","Canada". The certification shall indicate the bearing was manufactured of stainless (corrosion resistant) steel (440C) or chrome steel (52100) to tolerances which are equal to or exceed the requirements for
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