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IMPORTANT FACTS FOR THE OPERATION OF LIFT MAGNETS
3. LOAD ALLOY
Low carbon steels, such as SAE 1020 steel, are nearly as good conductors of magnetic force as pure
iron. However, many other alloys contain non-magnetic materials which reduce the ability of magnetic
force to flow into the load. An alloy such as SAE 300 series stainless steel is almost as poor a con-
ductor of magnetic force as air.
Type 416 stainless steel is considered magnetic, but it contains enough chromium so that a magnet
can develop only one-half as much force on a type 416 stainless steel load as it can on a SAE 1020
steel load.
The force developed on cast iron, because of the carbon content, is less than one-half the force
compared with SAE 1020 steel. Chilled cast iron further reduces the force to less than one-quarter.
4. LOAD LENGTH OR WIDTH
As the length or width of a load increases, it ceases to remain flat when lifted and the edges begin to
droop. This drooping or sagging of the load can create an air gap between the load and the magnet.
This is called peel; if peel occurs, the lifting capacity of the magnet is greatly reduced.
For plate lifting, where peel often occurs, rectangular shaped magnets must be positioned so that the
length of the magnet is parallel to the width of the load.
5. POSITION OF MAGNET'S LIFTING SURFACE
As the position of the magnet's lifting surface changes from horizontal to vertical, the lifting capacity of
the magnet decreases. When the magnet's lifting surfaces are vertical, the lifting capacity of the mag-
net is minimized and dependent upon the coefficient of friction between the magnet's lifting surface
and the load.
6. PORTION OF MAGNET SURFACE IN CONTACT WITH LOAD
The full surface of the magnet must contact the load if the magnet is to achieve rated lift capacity.
7. LOAD TEMPERATURE
The temperature of the load can cause damage to the magnet and, if high enough, can even change
the magnetic characteristics of the load. For Standard Lift Magnets, Walker should be consulted if the
load or air temperature exceeds 110° F (43° C).
800-WMAGNET
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