MIL-DTL-13241D
2.3 Non-Government publication. The following document forms a part of this document to the
extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation or
contract.
NCSL INTERNATIONAL
NCSL Z540.3
-
General Requirements for Calibration of Measuring and Test
Equipment
(Copies of these documents are available online at https://www.ncsli.org or from NCSL International
2995 Wilderness Place, Suite 107 Boulder, Colorado 80301-5404.)
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 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.2 Materials. The material used shall be as specified herein.
3.3 Strand. The strands shall be grade 40 HS, 40% conductivity, 0.0808 inch nominal diameter in
table II.
TABLE II. Physical requirements grade 40 HS.
Nom. dia.
Tensile
Breaking
Mass/unit
Mass/unit
Max.resistance
(in.)
strength, min.
strength, min.
length, lb (per
length, lb (per
@ 20ºC
Ω/1000 ft.
1/
1/
1/
psi
lb.
1000 ft.)
mile)
.0808
115,000
602
18.12
95.68
4.206
1/: For information purposes only.
3.4 Construction. The wire shall be constructed of the number and kind of strands as specified in 1.2
and 3.3. The strands shall lay naturally in their true positions and not tend to unstrand at the ends when
severed at any point. They shall permit restranding by hand after being forcibly unraveled (unstranded).
3.4.1 Lay. The stranded wire shall be constructed with a left-hand lay.
3.4.2 Pitch.
3.4.2.1 WS-12( )/U. The pitch of the 7 strand wire WS-12( )/U shall be from 10 to 16 times the
nominal wire diameter.
3.4.2.2 WS-13( )/U. The pitch of the 3 strand wire WS-13( )/U shall be from 14 to 20 times the
nominal wire diameter.
2
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