MIL-DTL-24050E
3.4 Construction. The rope shall conform to the requirements specified herein. The rope shall be a double
braided construction wherein an inner braid of hollow structure manufactured in a separate operation shall serve as
the core, while a cover (outer braid) is braided over it in a second operation. The weight of either the inner braid
or the outer braid shall not exceed 55 percent of the total weight of the rope. Heat setting of the yarns or finished
rope shall not be acceptable. Mixing of nylon fiber types, grades, or fibers of different manufacturers within the
core or within the cover shall not be permitted. Nylon fibers used in the core may, however, differ in type, grade or
manufacturing source from those used in the cover, provided that all the fiber components meet the requirements
of 3.3. If the breaking elongation of the fibers used in the core and in the cover braids are different, the higher
elongation fiber shall be used in the core.
3.4.1 Yarns. The fiber producer shall provide type of yarn that has been designated for cordage and tested for
its suitability for this application (see 6.3) Core yarns shall be one size and cover yarns shall be one size. In the
manufacture of each braid, one half of the yarns shall have an "S" twist, while the remaining yarns shall have a
"Z" twist. All yarns shall have sufficient twist such that the filaments on the outer surface of the inner and outer
braids are parallel to the axis of the rope. The type of braid, number of strands, yarns per strand, and multipliers
for the respective inner and outer braids shall be in accordance with tables I and II.
TABLE I.
Structural requirements for inner braid or core.
Rope size,
Multiplier for
nominal, circumference,
Number
Yarns per strand
determination
(inches)
Type of
of
of pick count
braid
strands
Min
Max
Min
Max
3/4 to
2 - 1/4
Plain
8
2
6
1.5
1.9
3/4 to
2 - 1/4
Twill
12
1
4
2.5
3.2
2 - 1/2 to
7 - 1/2
Plain
8
2
6
1.5
1.9
2 - 1/2 to
7 - 1/2
Twill
12
1
4
2.5
3.2
2 - 1/2 to
7 - 1/2
Twill
16
1
3
3.0
3.8
8 to
16
Twill
12
1
4
2.5
3.2
8 to
16
Twill
16
1
3
3.0
3.8
TABLE II.
Structural requirements for outer braid or cover.
Multiplier for
Rope size
Yarns per
determination of
nominal, circumference
Type of
Number
Strand
pick count
(inches)
Braid
of
strands
Min
Max
Min
Max
3/4 to 1 - 1/2
Twill
16
2
3
6.0
7.0
1 - 1/2 to 2 - 1/4
Twill
20
2
2
6.8
7.8
2 - 1/4 to 5 - 1/2
Twill
24
2
2
7.6
9.6
5 to 16
Twill
32
1
2
9.5
11.0
3.4.2 Multipliers. Multipliers specified in tables I and II overcome the complexity of listing a range of pick
counts for every size. Pick count and circumference for either the inner or outer braid shall be measured at the
appropriate load P (see table III) for the nominal rope size and shall be used in all calculations for the inner and
outer braids as appropriate. The calculation shall be as follows:
Multiplier = pick count times circumference.
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