Do NOT use class 19x7, 18x7,
17x7, or 24x7 wire rope attached to a swivel or have one or both
rope ends rotate freely under load. Doing so will result in a loss
of rope strength of between 30% to 40%.
Block Twisting (Cabling) will occur when used exceeding certain
lifting heights. This is NOT a non-rotating rope.
Call for advice
Main Applications:
Main- and auxiliary hoist line on mobile- and truck cranes. Often used
as a single point line. Large lifting heights will require a tag line
to prevent excessive spinning of the load.
Smaller sizes (< 3/8") are sometimes used on overhead cranes.
NOT recommended for construction tower cranes.
Rope Characteristic:
Using the rope to it’s maximum fatigue life will cause the rope
to deteriorate from the inside out. Sudden rope failures may be the result.
For this reason we do not recommend this construction for tower cranes.
There have been fatal and catastrophic accidents involving this rope construction
because of undetected inner rope fatigue.
However, mobile and truck mounted cranes are operated on a much less severe
duty cycle and it is not expected that 19x7 has to be replaced because
of inner rope fatigue but because of other mechanical damages. Keep in
mind that this statement covers normal mobile crane use. If you use a
mobile crane like a production crane you WILL experience the above mentioned
danger situations.
PLUS, regular type 19x7 does not spool very good on multiple layer drums;
there is too much strand interlocking causing excessive rope abrasion.
Standard:
ASTM A1023/A 1023M, Table 20
EN 10264, 12385 where applicable
RR-W-410-E
CSA G4-00
ISO 2408
Class 19x7 ropes are ROTATION RESISTANT but NOT
non-rotating (Class II)
Breaking Strengths
Note: The maximum CAPACITY, WORKING LOAD LIMIT (WLL), or LINE PULL of the
rope usually is 1/5 of the below stated values. For specific information
consult the standards applicable to your rope application.
Steel Wire Rope,
Rotation Resistant
Construction:
19 x 7 / 18 x 7 IWRC
Standard:
CSA G-4-00
RR-W-410E, type IV, class 2
19 x 7 (Steel Core)
Rope
dia.
inch
Nominal Strength
tons of 2000 lbs
EIPS
Weight
per foot
lbs
1/4
2.7
5/16
4.3
.18
3/8
6.1
.25
7 /16
8.3
.35
1/2
10.8
.45
9/16
13.6
.58
5/8
16.8
.71
3/4
24.0
1.02
7/8
32.5
1.39
1
42.2
1.82
1-1/8
53.1
2.30
1-1/4
65.1
2.84
Metric Class 18 x 7
Rotation Resistant
Metric rotation resistant ropes are mainly used in small sizes for overhead-
or shop gantry hoists applications. Use them only if absolutely required
(block starts to spin). Most smaller sizes are Made in Germany.
