MIL-DTL-43492D
*3.3.1.1 Types. All stitch types, except bartacking, shall conform to ASTM-D-6193 as
follows:
a. For all stitching except zig-zag stitching and stitching indicated by "Z" on drawings
and for attachment of slide fasteners type 301, 5 to 7 stitches per inch.
b. For zig-zag stitching - type 304, 10 to 14 stitches per inch.
c. For stitching indicated by "Z" on drawings and for attachment of slide
fasteners type 401, 5 to 7 stitches per inch. Chain portion of stitching shall not appear on outside of
tent or covers.
d. For bartacking 5/8 + 1/16 inch long, 1/8 inch minimum bight and containing
28 stitches.
3.3.1.2 Thread breaks. Thread breaks in stitching shall be overstitched not less than 1 inch at
each break on stitch type 301, not less than ¾ inch at each break on stitch type 304 and not less than 1
½ inches at each break on stitch type 401. Thread breaks in type 401 stitching may be overstitched
with stitch type 301. Bartacks shall be free of thread breaks.
3.3.1.3 Stitching ends. The ends of 301 stitching shall be overstitched not less than 1 inch
except where ends are turned under in a hem or held down by other stitching. Where 301 stitching is
performed automatically on stitch patterns such as box, box with cross-stitch, "W" stitching or straight
line tacking, not less than three tying, overlapping , or back stitches shall be used to secure the ends of
stitching. The ends of type 304 stitching shall be firmly secured by backstitching or overstitching or by
increasing the number of stitches per inch at the ends for a minimum of ¼ inch.
3.3.1.4 Skipped stitches. Two or more consecutively skipped stitches occurring in type 301 or
304 stitching shall be overstitched not less than 1 inch. Any skipped stitches in type 401 stitching shall
be overstitched not less than 1 ½ inches. Skipped stitches in 401 stitching may be overstitched with type
301 stitching.
3.3.1.5 Thread lubricant. The addition of any lubricant to the polyester sewing thread prior to
or during the sewing operation is prohibited.
3.3.2 Splicing of cloth. There shall be no splicing of tent end, intermediate sections or cover
panels. Splicing of reinforcements and sod cloth sections will be allowed provided no piece is less than
24 inches long. Pieces shall be joined as shown on Drawing 5-4-962.
3.3.3 Attachment of wood toggles. Attachment of wood toggles shall be as illustrated on
drawings. Wrap cord around the toggle 1 ½ times and secure with an overhand knot in a manner that
prevents removal of toggle.
3.3.4 Attachment of slide fasteners. Care shall be exercised to trim all thread ends to ½ inch or
less and to maintain specified distances between edges of fabric attached to slide fastener tape so that
there will be no interference with the operation of the slider. The length of the slide fastener chain shall
be such that after the slide fastener is sewn on, the tape shall not be puckered and the slider shall
operate freely.
3.3.5 Setting of grommets. Holes punched to receive grommets shall be smaller than the
outside diameter of the grommet barrel so that the barrel must be forced through the hole. Grommets
shall be securely clinched without cutting the materials. Roll of the clinched grommet shall not contain
more than three scores (splits).
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