MIL-DTL-13931J
b.
Tube and breech ring or corresponding part.
c.
Tube and supporting rings or muzzle attachments.
d.
Intermediate or locking parts included in a., b. or c.
3.4.6.5.3 Breechblock counterbalances. Before being assembled, all parts of counterbalances shall be
cleaned of all metal chips and foreign matter and coated with grease conforming to MIL-PRF-81322.
3.4.6.5.4 Automatic cannon. Unless otherwise specified, automatic cannon shall be lubricated with oil
conforming to MIL-L-14107.
3.4.6.5.5 Solid-Film lubricants. Unless otherwise specified, cannon parts coated in conformance to
B8769470 shall not be coated with other lubricants.
3.4.7 Marking. Parts and assemblies shall be clearly and legibly identified in accordance with the
requirements of the applicable detail drawings, MIL-STD-130, and this specification.
3.4.7.1 Size of marking. The size of characters shall be a minimum of 1/8 inch high. Where area
available is too small, then the largest characters consistent with the area shall be used.
3.4.7.2 Type of marking. Letters shall be sans-serifs such as "Gothic" or "Futura" capitals, and the
numerals shall be Arabic.
3.4.7.3 Methods of application. Marking shall be directly applied to the surface of the item by metal
stamp, embossing, engraving, forging, casting, molding, electrochemical etch, electric arc pencil, or laser
marking. When these methods are not possible, because of potential damage to the item or nonlegibility
of the marking, the marking shall be directly applied on the item by environmentally protected
decalcomania transfer, metal or plastic wrap around tag, stencil, silk screen, identification plate, tag, or
indelible ink stamp. When the item cannot be marked on its surface or tagged, the item shall be placed in
a unit container (bag, etc.) with the identification marking located on the unit container in addition to, or
in combination with the marking information specified in MIL-STD-129.
3.4.7.3.1 Caution. Identification marking of items shall not affect the life and utility of the item.
Marking materials creating hazardous conditions shall not be used.
3.4.7.4 Location, legibility and permanency. Location shall be as specified on the drawing or in the
contract. Legibility shall be such as to be readily readable. Identification marking on identification plates
shall be of a contrasting color to the plate surface. Marking shall be of a permanency to prevent
obliteration or obscuring through wear, climatic exposure and normal cleaning processes.
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