Designed for lighter locking, Lockman is
manufactured with a spun and filament blend polyester cover over a strand core
of monofilament polypropylene. The lay of the rope is medium-soft to optimize
tensile strength. The fuzzy softness of polyester cover yarns serves to diffuse
heat buildup and offers excellent abrasion resistance. (Lockman is available
with a high-tenacity co-polymer core upon request.)
White, no tracer
Due to the weight of rope
reels/coils please call Jay at
763-263-9835 for freight charges and to order. Some orders may
qualify for pre-paid freight.
Designed for medium and heavy locking,
Lubelock has a cover of 100% fuzzy DuPont®
T-77 multiplex Dacron®
fiber. The core of each strand is 100% high strength SuperPro
co-polymer with a proprietary lubricant added to improve rendering. As
tension is put on the rope, the lubrication migrates to the strand
surface, decreasing fiber on fiber friction resulting in less heat
The co-polymer core
and beefy multiplex polyester cover give Lubelock superior tenacity.
This enables the rope to be built with a firm lay to further improve
abrasion resistance. Lubelock is engineered to have all the right
stuff: balance, tenacity, long working life, and ease of use.
White with one orange tracer on a
TENSILE STRENGTHS: are determined from tests on
new, unused rope in accordance with standard test methods of the Cordage
CAUTION: USE OF WORKING LOADS
Because of the wide range of rope use, rope condition,
exposure to the several factors affecting rope behavior, and the degree of
risk to life and property involved, it is impossible to make blanket
recommendations as to working loads. However, to provide guidelines,
working loads are tabulated for rope in good condition with appropriate
splices, in non-critical applications and under normal service conditions.
The Cordage Institute Formula for working load is:
Working Load = Minimum Breaking Strength/Safety Factor
A higher working load may be selected only with expert
knowledge of conditions and professional estimate of risk. Also, if the
rope has not been subject to dynamic loading or other excessive use, has
been inspected and found to be in good condition, is to be used in the
recommended manner; if the application does not involve elevated
temperatures, extended periods under load, or obvious dynamic loading (see
explanation below) such as sudden drops, snubs or pickups. For all such
applications and for applications involving more severe exposure
conditions, or for recommendations on special applications, call Jay at
**Many uses of rope involve serious risk of injury to
personnel or damage to valuable property. This danger is often obvious, as
when a heavy load is supported above one or more workmen. An equally
dangerous situation occurs if personnel are in line with a rope under
tension. Should the rope fail, it may recoil with considerable force.
Persons should be warned against the serious danger of standing in line
with any rope under tension. IN ALL CASES WHERE SUCH RISKS ARE PRESENT,
THERE IS ANY QUESTION ABOUT THE LOADS INVOLVED OR QUESTIONS ABOUT THE
CONDITIONS OF USE, THE WORKING LOAD SHOULD BE SUBSTANTIALLY REDUCED AND
THE ROPE PROPERLY INSPECTED.
DYNAMIC LOADING VOIDS NORMAL WORKING LOADS
Normal working loads are not applicable when the rope
is subject to significant dynamic loading. Whenever a load is picked up,
stopped, moved or swung there is an increased force due to dynamic
loading. The more rapidly or suddenly such actions occur, the greater the
increase will be. In extreme cases, the force put on the rope may be two,
three or even more times the normal involved. Examples could be picking up
a tow on a slack line or using a rope to stop a falling object. Therefore,
in all such applications such as towing lines, lifelines, safety lines,
climbing ropes, etc. working loads as given DO NOT APPLY.
Users should be aware that dynamic effects are greater
on a low elongation rope such as polyester than on a high elongation rope
such as nylon, and greater on a shorter rope than on a longer one. The
working load ratios listed contain provision for very modest dynamic
loads. This means, however, that when this working load has been used to
select a rope, the load must be handled slowly and smoothly to minimize
dynamic effects and avoid exceeding the provision for them.
EFFECT OF TEMPERATURE ON TENSILE STRENGTH
The tensile strength charts apply to ropes tested at
normal room temperature (70°F). Ropes have lower
tensile strengths at higher temperatures. 30°F (or more) lower at the
boiling point of water (212°F) and continuing on down to zero strengths
for nylon and polyester at 490°F and 300°F for polypropylene.
Also, continued exposure at
elevated temperatures causes permanent damage. TENSILE STRENGTHS
shown are average based on new ropes tested under laboratory conditions,
minimum can vary by 10%.