MIL‐DTL‐81543C
3.3.3 Cementing of the seams, seam tapes, patches, and attachments. Seam construction and seam tape,
patch, and attachment applications shall be in accordance with applicable drawing requirements. The
techniques and precautions outlined in 3.3.2 shall be used in order to effect optimum bonding properties, and
to ensure compliance with the requirements of this specification. The adhesive shall be applied in a straight
line parallel to the edges of the seam, seam tape, patch, or attachment; and shall extend from just being
visible to a maximum of one inch beyond the applicable edge. The adhesive shall not be allowed to remain in
clots or permitted to extend in such a manner as to result in localized stiffness. There shall be no spots or
stains resulting from the cementing operation. The cemented areas shall not contain any trapped air,
channels, edge lifts, or excessive wrinkling.
3.3.4 Seams and stitching. Unless otherwise specified, all the seams and stitching used in the fabrication of
the container assemblies shall conform to applicable drawing requirements; and shall be accomplished with
stitch Type 301 conforming to ASTM D6193, with 6 to 8 stitches per inch. All the seam edges shall be
properly forced out and shall not contain any folds. No seam shall be twisted, puckered, or pleated, and no
part of the container shall be caught in an unrelated operation or seam. All the thread ends shall be trimmed
to a length of 1/4 to 3/8 inch. Each row of stitching shall be straight and parallel to the seam edge. The
straightness of the stitching, in any row, shall be maintained within a tolerance of 1/32 inch. The ends of the
stitching that are not caught in other seams or stitching shall be securely backstitched, by overlapping on itself
for at least 1/2 inch. Thread breaks, skips, and run-offs shall be overstitched not less than one inch. The
thread tension shall be maintained so that there shall not be any loose or overly tight stitching, and the lock
shall be imbedded in the materials sewn together. There shall be no spots or stains resulting from the sewing
operation.
3.3.4.1 Bartacking. Unless otherwise specified, the number of stitches per bartack shall be based
proportionally on 7/8 inch long bartack containing a minimum of 49 stitches. The length and location of each
bartack shall be as specified in applicable drawings.
3.4 Color. The color of the containers and components shall be as specified in applicable drawings.
3.5 Markings. Markings shall be in accordance with MIL-STD-130. Ink, color, size, and location of markings
shall be as specified in applicable drawings. Letters and numerals 1/4 inch or less in height shall not be
stenciled. Serial number for containers shall be in accordance with 3.5.1. All markings shall be thoroughly
dry prior to packing or packaging. Markings may be applied directly to the specified area or to a patch
securely adhered to the specified area. Material and color of the patch, if used, shall be the same as the
container material to which applied.
3.5.1 Serial numbers. Unless otherwise specified, each container shall be identified by a serial number
which shall be assigned by the manufacturer. Serialization shall be by a block of consecutive number to
cover the entire acquisition quantity.
3.6 Dimensions. When measured as specified in 4.4.2, the dimensions of the containers shall conform to
applicable drawing requirements.
3.7 Workmanship. After completion of the final assembly, the containers shall be thoroughly cleaned and all
loose thread, lint, and foreign matter shall be removed. The grommets and snap fasteners shall be clinched
without distortion, damage, splitting, or cutting of the cloth, webbing or tape as applicable. The metal
components shall not be misaligned nor contain any sharp edge, crack, dent, nick, burr, or sliver. The
containers shall not contain any nonspecified hole, abraded area, tear, cut, mend, needle chew, spot, or stain.
The container assemblies shall conform to the quality and grade of product established by this specification.
The occurrence of defects shall not exceed the acceptance criteria established herein.
4. VERIFICATION
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business