MIL-DTL-1688G
2.3 Non-Government publications. The following documents form a part of this specification to the extent
specified herein. Unless otherwise specified, the issues of these documents are those cited in the
solicitation or contract.
AMERICAN SOCIETY FOR QUALITY (ASQ)
ASQ Z1.4
- Sampling Procedures and Tables for Inspection by Attributes
(Copies of this document are available from www.asq.org or the American Society for Quality, 611 East
Wisconsin Avenue, Milwaukee, WI 53202.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3)
in accordance with 4.3.
3.2 Government and contractor purchase. The requirements specified in 3.9 and 3.10 apply only to rope
purchased directly by the Government. All other requirements apply both to rope purchased by a contractor
as a component for an end item and to rope purchased directly by the Government.
3.3 Materials. The rope shall be fabricated from a minimum of 6 denier per filament, bright, virgin,
continuous filament, light and heat-resistant polyamide (nylon) having a minimum 6.5 grams per denier
strength. The nylon shall be a long chain polymer made of hexamethylene diamine and adipic acid or its
derivatives, or a long chain polymer of epsilon amino caprioic acid. Mixtures of nylon fiber types (6 or 66) in
any one rope shall be prohibited. It is encouraged that recycled material be used when practical as long as
it meets the requirements of this specification.
3.4 Construction and physical requirements. The rope shall be of three strand construction and conform
to the requirements specified herein and in table I. each strand shall be made of the same size of three ply
yarns. All strands shall have an equal numbers of yarns. The singles yarn shall be between 2500 and
8000 denier. The single yarn, when measured in the three ply, shall be left-hand or "S" lay and shall have a
minimum of 22 turns per foot. The lay of the rope shall be right-hand or "Z" lay. The rope shall be heat set
and shall not show more than a 5 percent residual shrinkage when tested as specified in 4.4.4. The rope
shall be fabricated without knots or splices in the singles yarns, ply yarns, strands, or rope.
TABLE I. Physical requirements
Sizes
Diameter
Length
Breaking
Elongation
Length per 10 turns
(circumference)
approximate
feet per lb
strength
minimum
maximum
Minimum
(inches)
(inches)
minimum
minimum
(percent)
(inches)
(inches)
+1/8 , -1/16
1/
2/
(pound)
¾
¼
47.0
1300
35.0
7.8
7.0
1-1/8
3/8
23.0
3150
35.0
12.4
11.1
1-1/4
7/16
17.0
4500
35.0
14.3
12.9
1-1/2
½
8.5
6500
35.0
17.2
15.1
1/ Not a specification requirement, included for information only.
2/ A minus tolerance of 10 percent is allowed for dyed rope.
2
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