MIL-DTL-44475A(GL)
3.3.1.1.1 Repairs of type 301 stitching. Repairs of type 301 stitching shall be as follows:
a. When thread breaks or bobbin run-outs occur during the 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) from the end of the stitching. 1/
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 from the defective area, (1/2 inch for box-x and W-W stitching),
continue over the defective area, and continue a minimum of 1 inch (1/2 inch for 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. 1/
1/ When making the above repairs, the ends of the stitching are not required to be backstitched.
3.3.1.1.2 Repairs of type 308 stitching. Repairs of type 308 stitching shall be in accordance
with 3.3.1 .1.1 a and 3.3.1 .1.1 b, except that the stitching shall overstitch the defective area a
minimum of three stitches onto the existing stitches.
3.3.1.2 Automatic stitching. Automatic stitching machines may be used to perform any of
the required stitch patterns provided the requirements for the stitch pattern, stitches per inch, and
size and type of thread arc met, and at least three or more tying, overlapping, or back stitches are
used to secure the ends of stitching.
3.3.2 Thread ends. All thread ends shall be trimmed to a maximum length of 1 /4 inch.
3.3.3 Setting of grommets. Holes shall be prepunched to receive the grommets. Holes
prepunched to receive the grommets shall be smaller than the outside diameter of the grommet
barrel so that the barrel must be forced through the hole. The grommet shall be securely clinched
without cutting the adjacent material.
3.3.4 Finishing of the jacketed wire rope ends. All wire rope ends shall be finished by either
the melt method specified in 3.3.4.1 or by the dip method specified in 3.3.4.2 such that the ends
are completely enclosed with the melted coating flush with the unmelted nylon jacket.
3.3.4.1 Melt method. Heat the wire rope end nylon jacket with a suitable electrical heating
element so as to melt the nylon over the end to form a smooth round surface. Remove any
melted residue on the jacket surface with a fine abrasive material such that the surface is not
damaged and is finished smooth.
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