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How to estimate the
actual lifting value?
Armstrong LiftMagTM
is the sign of high quality lifting magnets. However, it
does not mean that any model is suitable for your application.
1）Please
remember the following instructions while selecting lifting magnets:
All NL-B lifting magnets can lift thick metals only. They are not good
for lifting thin plate.
A single lifting magnets cannot lift a sheet metal of big size, even
though the sheet is light. The big sheet should be lifted with two or
more lifting magnets with a spreader bar.
NL-B lifting magnets work below 60°C.
Not work under water.
2）The
actual lift value are greatly effected by the thickness, surface
conditions, size, Carbon composition and working temperature of the
work load to be lifted. |
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We manufacture safe, durable and
reliable lifting magnets.
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NL-B series lifting magnets |
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Lifting capacities for different thickness of flat sheet metal:
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Thickness（mm） |
NL-330B |
NL-660B |
NL-130B |
NL-2200B |
NL-4400B |
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60 |
100% |
100% |
100% |
100% |
100% |
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55 |
100% |
100% |
100% |
100% |
100% |
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50 |
100% |
100% |
100% |
100% |
95% |
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45 |
100% |
100% |
100% |
100% |
90% |
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40 |
100% |
100% |
100% |
100% |
85% |
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35 |
100% |
100% |
100% |
90% |
75% |
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30 |
100% |
100% |
100% |
80% |
60% |
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25 |
100% |
100% |
90% |
70% |
55% |
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20 |
100% |
90% |
75% |
60% |
45% |
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15 |
100% |
70% |
60% |
50% |
Not
work |
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10 |
70% |
50% |
40% |
Not
work |
Not
work |
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5 |
Not
work |
Not
work |
Not
work |
Not
work |
Not
work |
The surface conditions of the load"
The air gap between the load and the
lifting magnet would be produces by rough , dirty, painted, and
not flat surface and consequently the lifting force will be
greatly decreased.
Air gap=0，100%
of the rated lifting value，example:
Flat, clean and smooth surface.
Air gap=0.1mm，90%
of the rated lifting value, example: Surface with a little bit
dust.
Air gap=0.3mm，80%
of the rated lifting value, example: Rusty surface.
Air gap=0.5mm，70%
of the rated lifting value, example: Heavy rusty, or painted
surface.
Air gap=0.8mm，50%
of the rated lifting value, example: The surface is not very
flat, or have burrs on it.
The more alloy content in the load material, the lower the
holding force is.
Low Carbon
Steel: 100%
Middle Carbon Steel: 85%
High Carbon Steel: 70%
Cast iron: 50%
Example：
The load is a
1M x 1M x 10CM thick low Carbon flat sheet metal with dirty and
rough surface. Does NL-2200B work for lifting it?
Answer: Expected rated lifting value for
the metal = 1,000 kgs x 100%（The
thickness of the plate）x
80%（Surface
conditions of the plate）x
100%（Low
Carbon）=
800 kgs.
The plate is 780KG.
So, NL-2200B can lift the plate.
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