MIL-DTL-29469A(MC)
3.4.1.2. Type 301 stitching. Ends of stitching shall be
backstitched or overstitched not less than 1 inch except where
ends are turned under or caught in other seams and stitching.
Thread tension shall be maintained so that there shall 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 imbedded in the materials
sewn.
Repairs of type 301
3.4.1.2.1 Repairs of type 301 stitching.
stitching shall be as follows:
a.
When thread breaks or bobbin run-outs occur during
stitching, the stitching shall be repaired by restarting the
stitching a minimum of 1 inch (1/2 inch for box-x and W-W
stitching) back of the end of the stitching.
b.
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 in back of the defective area
(1/2 inch on box-x and W-W stitching), continue over the
defective area, and continue a minimum of 1 inch (1/2 inch on
box-x and W-W stitching) beyond the defective area onto the
existing stitching. Loose or excessively tight stitching shall
be repaired by removing the defective stitching without damaging
the materials and restitching in the required manner.
c.
When making the repairs, the ends of the stitching are
not required to be backstitched.
3.4.1.3. Bartacks. Bartacks shall be as specified on the
applicable drawing and as follows:
Length + 1/16 inch
Width + 1/32 inch
Stitches per bartack
1/2 inch
1/8 inch
28
3/4 inch
1/8 inch
42
Bartacks shall be free from thread breaks and loose stitching.
3.4.1.4. Thread ends.
All thread ends shall be trimmed to 1/4
inch maximum length.
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