MIL-STD-792F(SH)
19 May 2006
5.9.2 No marking shall reduce the wall thickness of the part below the minimum required by the applicable drawing or specifications.
5.9.3 Tube and pipe shall not be marked with the type V permanent marking method.
5.9.4 All marking shall be legible.
5.9.5 Permanent identification marking shall be applied on low stressed areas such as a flange rim, top of nut, top of stud or an integral pad or boss as determined by considering
applied loads on individual parts.
5.9.6 Where possible, marking shall be located so that the marking will not be defaced during installation (for example, not marked near welds, wrenching surfaces, on flange faces, and so forth).
5.10 Limitations on permanent identification marking.
5.10.1 Permanent identification markings and their locations shall be indicated on the applicable drawings or in a specification or procedure. Permanent marking may be characterized by the following attributes for inclusion in detail manufacturing instructions, manufacturing procedures or detail part drawings:
(a) type of marking
(b) specific characters to be applied
(c) approximate location of characters on a specific part
(d) minimum character size
(e) other characteristics as appropriate.
5.10.2 Hardened materials shall be marked only by the type II method. Hardened material is any material, except carbon steel with a specified carbon content of 0.35 percent or less, which has had its mechanical strength increased by quenching and tempering, aging or cold working.
5.10.3 Base material or pressure boundary parts less than 1/8 inch thick shall be permanently marked by the type II method. The base material thickness of pipes is considered to be the nominal wall thickness. The base material thickness for tubing is considered to be the minimum wall thickness specified.
5.10.3.1 Piping less than 1/8 inch thick may also be permanently marked using the type
IX method with the following exceptions:
(a) No marking shall be applied in bent or welded areas (including heat affected zones) of pipe or areas which will be bent after marking.
(b) No marking shall be applied to areas of pipe which will be flared or flanged.
5.10.4 Type II permanent marking shall not be used on carbon steels except as specified in 5.10.2 and 5.10.3.
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