MIL-DTL-40082C
having a bevel of 16° + 6° - 0° to prevent undercutting and subsequent breaking of design
elements.
3.3.3.2 Cutting of hubs and dies for items requiring enamel. The cutting requirements
for hubs and dies for items requiring enamel shall be as stated above (3.3.3.1) except for
the following: Areas to be enameled (dike areas) shall be cut to a minimum depth of 0.015
inch. In order to prevent stoning off of the modeled detail in the polishing process, modeled
areas or detail lines shall be cut shallower than the dike lines to a minimum height/depth of
0.007 inch.
3.3.4 Design strikes. A lead or pewter strike from the die of the master set (see 3.5)
shall be submitted for Government approval and acceptance before the hub or die is
hardened.
3.3.5 Heat treating. Hubs and dies shall be normalized as required, hardened, and
tempered. Hardness shall be Rockwell 59C to 61C for hubs and Rockwell 57C to 58C for
dies when tested as specified in 4.2.5.
3.3.6 Finishing.
3.3.6.1 Finish of dies. The top and bottom surfaces of all dies shall be ground parallel
to one another. The area of the top surface which surrounds the design shall be ground
smooth. The entire bottom surface shall be ground smooth.
3.3.6.2 Finish of hubs. The entire bottom surface of all hubs shall be ground smooth.
The top surface shall have a minimum of three areas, spaced 120° apart, which are ground
parallel to the bottom surface and which shall have sufficient smoothness for hardness
testing.
3.4 Marking for identification. Hubs and dies shall be legibly marked on the outer
periphery by engraving or metal stamping with the following information:
a.
name of item
b.
type of steel
c.
date hubs and/or dies were completed
d.
name or trademark of manufacturer
e.
the words "U.S. Property" or "U.S. Prop" in characters not less than 1/8 inch high.
f.
TIOH hub or die number (unless manufactured for another government organization)
3.5 Master set for new development items. A master set is considered to be the
original die or the original hub and die and is to be used in making the design strikes for a
new heraldic metal item. Only master sets shall be accepted as Government-owned hubs
and dies for new development items.
3.6 Workmanship. Hubs and dies shall be clean, well made, and free from
imperfections which may adversely affect their durability and serviceability in manufacturing
high quality heraldic insignia.
3.7 Protection. Prior to storage, packing, or shipping, the tops of all hubs and dies shall
be covered with an oil-exuding wax or a wax-like coating equal to or better than HR-49 from
3
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business