Technical Foundation
What Is a Below the Hook Lifting Magnet?
A below the hook lifting magnet is a crane-mounted attachment that lifts ferrous (iron/steel) loads by magnetic attraction rather than mechanical grip, eliminating the need to sling, chain or clamp the load — particularly valuable for flat plate, structural shapes and scrap material that would otherwise be difficult or slow to rig. Rated lifting capacity is always specified for an ideal condition (clean, flat, smooth steel of a minimum thickness) and derates significantly on rough, curved, painted, or thin material.
Permanent magnets use rare-earth or ferrite magnetic material and require no external power, making them simple and failure-safe but requiring manual mechanical release (a lever that shunts the magnetic circuit). Electromagnetic magnets use an electrical coil and require continuous power to hold the load, posing a serious drop hazard on power loss unless equipped with a battery backup. Electro-permanent magnets combine both principles — a brief electrical pulse switches the magnet on or off, after which the permanent magnetic circuit holds the load without continuous power, addressing the power-loss risk of pure electromagnets.
Prefer a quick quote?
Get Below the Hook Lifting Magnets Pricing in Your Inbox
Skip the search — tell us the load weight, material thickness and load surface condition and we will come back with pricing.
| Spec | What It Means | Why It Matters |
|---|---|---|
| Rated Capacity | Specified for ideal clean, flat, thick steel | Actual safe working load derates on rough, curved, thin, or coated material |
| Magnet Type | Permanent, electromagnetic, electro-permanent | Determines power dependency and fail-safe behavior on power loss |
| Load Surface Condition | Clean/flat vs. rusty/painted/rough | Surface condition directly reduces achievable holding force below rated capacity |
| Material Thickness | Minimum thickness for rated capacity | Below minimum thickness, magnetic circuit cannot fully saturate and capacity drops sharply |
| Release Mechanism | Manual lever, powered release, remote control | Determines operator interaction required to safely release the load |
Shop Below the Hook Lifting Magnets
Browse Below the Hook Lifting Magnets Sub-Categories
Organised by magnet type. Pick a sub-category, or describe your load weight and surface condition and let ChatMRO match the magnet.
How it works
From Half-Remembered Part Number to PO, in Three Steps.
Ask
Type an MPN, paste a spec sheet, or describe the part in plain English. ChatMRO understands engineer-speak.
Compare
Side-by-side specs, cross-references, and equivalents from multiple sources — without the clutter of endless browser tabs.
Quote & Buy
Request a quote or add to cart. Volume discounts, VAT-aware pricing, and consolidated procurement — all in one place.
Applications
Where Below the Hook Lifting Magnets Get Used
Below the hook lifting magnets are used anywhere flat or irregular ferrous material needs to be lifted by a crane without mechanical rigging.
Steel Plate & Coil Handling
Lifting and positioning flat steel plate and sheet stock in fabrication and steel service centers.
Scrap Yard & Recycling Operations
Handling loose and irregular ferrous scrap material with electromagnetic and electro-permanent magnets.
Structural Steel Fabrication
Positioning structural shapes and beams during fabrication and assembly.
Foundry & Casting Operations
Moving ferrous castings and ingots within foundry and casting production areas.
Steel Mill Material Handling
Handling coil, billet and plate stock throughout steel mill processing operations.
FAQ
Below the Hook Lifting Magnets Questions, Answered
How is a lifting magnet's rated capacity determined?
Rated capacity is tested and published for ideal conditions — clean, flat, smooth steel at or above a specified minimum thickness. Real-world capacity must be derated for surface rust, paint, curvature, or material thinner than the rated minimum, since all of these reduce the magnetic circuit's ability to fully couple with the load.
What happens to an electromagnetic lifting magnet if power is lost?
A standard electromagnetic lifting magnet requires continuous power to hold its load and will drop the load immediately on power loss — this is a serious safety hazard, which is why electromagnetic magnets used for overhead lifting of personnel-adjacent loads should include a battery backup system or be replaced with an electro-permanent design that doesn't depend on continuous power.
What's the advantage of an electro-permanent magnet over a standard electromagnet?
An electro-permanent magnet only needs power briefly to switch its magnetic state on or off — once engaged, the permanent magnetic material holds the load without continuous electrical power, eliminating the power-loss drop hazard inherent to standard electromagnets while still offering powered on/off control that a pure permanent magnet lacks.
Can lifting magnets be used on painted or coated steel?
Yes, but holding capacity is reduced because paint, rust, scale or other coatings increase the air gap between the magnet face and the base steel, weakening the magnetic circuit — always apply the manufacturer's derating factors for surface condition rather than assuming full rated capacity on coated material.
Do lifting magnets need periodic inspection?
Yes — lifting magnets are a critical lifting device and should be inspected per a documented schedule (and applicable crane/rigging regulations) checking magnetic face wear, cable/harness condition, release mechanism function, and (for powered magnets) backup battery condition.
Keep browsing
Related Categories
Explore More
Find Your Next Part Now.
Describe a part number, spec or what it does.