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Ref. No. : ISO/R 346 - 1963 (E)
IS0
I NTERN AT1 O N A L ORGAN IZAT I ON FOR STAN DA RD 1 ZATl O N
IS0 RECOMMENDATION
R 346
SHIPBUILDING DETAl LS
GALVANIZED STEEL WIRE ROPES
1st ED IT I ON
October 1963
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COPYRIGHT RESERVED
IS0 Recommendations and IS0 Standards belongs
The copyright of
to IS0 Member Bodies. Reproduction of these documents, in any
country, may be authorized therefore only by the national standards
organization of that country, being a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 346, Shipbuilding Details - Galvanized Steel Wire Ropes, was
drawn up by Technical Committee ISO/TC 8, Shipbuilding Details, the Secretariat of which is
held by the Stichting Nederlands Normalisatie-instituut ("1).
Work on this question by the Technical Committee began in 1952, taking into account the
studies which had been made vq' the former International Federation of the National Standard-
izing Associations (ISA), and led in 1960 to the adoption of a Draft IS0 Recommendation.
In October 1961, this Draft IS0 Recommendation (NO 465) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies :
Australia India Spain
Belgium Italy Switzerland
Czechoslovakia Japan Turkey
Finland Netherlands United Kingdom
France New Zealand U.S.S.R.
Germany Portugal Yugoslavia
Greece Romania
One Member Body opposed the approval of the Draft: U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in October 1963, to accept it as an IS0 RECOMMENDATION.
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ISO/R 346 - 1963 (E)
IS0 Recommendation R 346 Octo ber 1963
SHIPBUILDING DETAILS
GALVANIZED STEEL WIRE ROPES
1. SCOPE
This IS0 Recommendation covers ropes for standing and running rigging, hawsers, mooring
and towing purposes and also cargo gear ropes. The provisions apply to round-strand galvanized
steel wire ropes of ordinary or regular lay, the lay being right-hand unless otherwise specified.
2. DEFINITIONS
2.1 Actual breaking load of the wire rope. Maximum load obtained in tension in an approved
testing machine at the moment of complete or partial fracture of a random sample cut
from the rope.*
2.2 Theoretical aggregate hrealcing load of wires in a rope. Sum of the breaking loads of all
the wires in a rope, based on the value as obtained from the coefficient k, and using a tensile
strength equal to the minimum of the tensile range specified plus 5 kgf/mm2 (3.2 tonf/in2)
(49 N/mm2).
Factor by which the nominal diameter of the rope should be divided to
2.3 CoefJicient k,.
obtain the theoretical diameter of the wires for the external layer.
2.4 CoefJicient k,. Factor which takes into account the loss of strength in the process of
manufacture and by which the theoretical aggregate breaking load is multiplied in order to
obtain the calculated minimum breaking load, given in the tables.
As a basis for this calculation, a mean tensile strength of wire has been assumed, equal to the
minimum value for the grade of wire plus 5 kgf/mm2 (3.2 tonf/inz) (49 N/mm2).
Note. - It is essential that a test of the actual breaking load, as described above, be carried out in order
to confirm compliance with the calculated minimum breaking load. The actual breaking load obtained
from this test should be shown on the test certificate.
The values taken are as follows:
Grade 140 to 159 kgf/mm2 (89 to 101 tonf/in2) (1375 to 1560 N/mm2):
145 kgf/mm2 (92 tonf/in2) (1420 N/mm2).
Grade 160 to 179 kgf/mm2 (101.5 to 114 tonf/in2) (1570 to 1755 N/mm2)
165 kgf/mm2 (105 tonf/in2) (1 620 N/mm2).
* See clause 187 of International Labour Ofice (ILO) Code of Practice, “Safety and health in dock work”, Geneva, 1958.
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ISO/R 346 - 1963 (E)
3. MEASUREMENT OF WIRE ROPE SIZE
The diameter D of the wire rope is measured over each pair of opposite strands, using a suitable
sliding caliper.
Measurements are made at each of three places at least 1.5 m (5 ft) apart, and the average of these
measurements is taken as the diameter, from which the circumference is calculated.
4. CLASSIFICATION OF TYPES
In this method of classification,
(6 A 93
denotes the textile core of the steel wire rope,
" a "
denotes the textile core of a strand (Types II and IV).
5. DIMENSIONS
The dimensions of the types of steel wire ropes listed below are given on pages 7 to 13:
. . see clause 5.1,
I: 6 strands of 7 wires - A + 6 (1 + 6) .
Type
...... . . see clause 5.2,
II: 6 strands of 12 wires - A + 6 (a + 12)
Type
III: 6 strands of 19 wires - A + 6 (1 + 6 + 2) . . . see clause 5.3,
Type
IV: 6 strands of 24 wires - A + 6 (a + 9 + 5) . . . see clause 5.4,
Type
V: 6 strands of 37 wires - A + 6 (1 + 6 + 2+18). . . . see clause 5.5,
Type
. see clause 5.6,
VI: 6 strands of 31 wires - A + 6 [1 + 6 + 3 + 6) + 12
Type
VII: 6 strands of 36 wires - A + 6 [I + 7 + (7 + 7) + 141 . see clause 5.7,
Type
Type VIII: 7 strands of 7 wires - (1 + 6) + 6 (1 + 6) . . . . . . . see clause 5.8,
see clause 5.9.
Type IX: 7 strands of 19 wires - (I + 6 + 12) + 6 (I + 6 + 12) .
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ISO/R 346 - 1963 (E)
5.1 Galvanized Steel Wire Ropes, Type I
6 strands of 7 wires :
A+6U +9
k, = 9.4
k, = 0.9
Tensile strength of wire:
140 to 1 59 kgf/m m2
(89 to 101 tonf/in2)
(1 375 to 1560 N/rnrn2)
Approximate
Nominal Calculated minimum
sizes of rope breaking load mass
Circumference
Diameter
kgf 1
tonf lb/100 ft
mm inches (1 kgf = 9.8 N)
8 3150 3.1 0.22 14.8
0.28
9 3950 3.8 18.8
0.34
10 4800 4.7 22.9
0.41 27.6
11 5800 5.7
12 7400 7.3 0.52 35.0
0.69
14 9800 9.6 46.4
0.89
16 12 600 12.4 59.9
15 700 15.5 1.11 74.6
18
20 200 19.9 1.42 95.5
20
22 24 100 23.7 1.69 127.0
28.0 1.99 134.0
24 28 400
33 O00 32.5 2.32 156.0
26
39 300 38.6 2.76 186.0
28
32 50 400 49.5 3.54 238.0
4.54
36 64 700 63.7 306.0
5.54 372.0
40 78 900 77.5
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ISO/R 346 - 1963 (E)
5.2
Galvanized Steel Wire Ropes, Type II
6 strands of 12 wires :
A + 6 (a + 12)
Tensile strength of wire:
140 to 159 kefirnrn,
(89 to 1 O1 to"nf/in2)
(1 375 to 1560 N/mrn2)
Nominal Calculated minimum
Approximate
sizes of rope breaking load mass
Diameter Circumference
kgf
lb/100 ft
mm inches (I kgf = 9.8 N)
8 1850 1.8 0.15 10.1
9 2650 2.5 0.21 14.1
10 3100
...