MIL-DTL-44312C
3.3.1 Thread, para-aramid. The thread for all stitching shall be size T-50, 3-ply, and shall be
dyed Camouflage Green 483, C.A. 34094, conforming to A-A-55195.
3.4 Design and construction. The design and construction of the vest shall be as specified herein,
and as shown on Drawing 2-11-1 and all subsidiary drawings and parts lists pertaining thereto.
3.4.1 Stitches, seams and stitchings. All stitches, seams, and stitching shall be performed using
stitch type 301 of ASTM D 6193 with and 8 to 10 stitches per inch and 1/8 +/- 1/16 inch
stitching margin.
3.4.1.1 Automatic stitching. Automatic stitching machines may be used to perform any of the
of the required stitch patterns provided the requirements for the stitch pattern, stitches per inch,
and size and type of thread are met, and at least three or more tying, overlapping, or back stitches
are used to secure the ends of stitching.
3.4.1.2 Type 301 stitching. Ends of all stitching shall be backstitched or overstitched not less
than 1 inch (1/2 inch for boxstitching), except where ends are turned under or caught in other
seams or stitching. Thread tensions shall be maintained so that there will be no loose stitching
resulting in loose bobbin or top thread or excessively tight stitching resulting in puckering of the
materials sewn. The lock shall be embedded in the materials sewn.
3.4.1.2.1 Repairs of type 301 stitching. Repairs of type 301 stitching shall be as follows:
a. When thread breaks or bobbin run-outs occur during stitching, except prestitching, the
stitching shall be repaired by restarting the stitching a minimum of 1 inch (1/2 inch for
boxstitching), back of the end of the stitching.1/
b. Except for pre-stitching, thread breaks or two or more consecutive skipped or run-off
stitches noted during inspection of the item (in-process or end item) shall be repaired by
overstitching. The stitching shall start a minimum of 1 inch back of the defective area (1/2 inch
on boxstitching), continue over the defective area, and continue onto the existing stitching.
Loose or excessively tight stitching shall be repaired by removing the defective stitching without
damaging the materials, and re-stitching in the required manner. 1/
1/ When making the above repairs, the ends of the stitching are not required to be backstitched.
3.4.2 Thread ends. All thread ends shall be trimmed to ¼ inch maximum length.
3.4.3 Setting of eyelets. Holes shall be pre-punched to receive the eyelets and shall be smaller
than the outside diameter of the eyelet barrel so that the barrel must be forced through the hole.
3.5 Labels. Each vest shall have an identification and instruction label conforming to type VI of
DDD-L-20. The labels shall show fastness to laundering.
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