Sarda Magnets Group · Kolkata, since 1958
Industrial magnets that hold, lift and separate steel.
Magnetic chucks, lifting magnets, separators and demagnetizers, designed and built in our own factories. 117 current models, each with an article number you can quote.
Magnetic work-holding · 33 models
Grip the whole job, not just its edges.
Permanent, electro and electro-permanent chucks for grinding, milling and EDM, in rectangular and round formats.
Magnetic separation · 21 models
Keep tramp iron out of the process.
Suspension separators, drums, pulleys, grids, rods and filters for foundries, mines, cement, food and recycling plants.
Magnetic mould clamping · EPPress
Clamp moulds magnetically, across the platen.
Electro-permanent clamping plates for the fixed and moving platens of injection moulding machines.
Find a model
Suggestions appear as you type: product families, models and exact article numbers.
Browse the catalogue
11 product families and 117 current models. Full catalogue index
Holding Magnets
8 models
Demagnetizers
5 models
Magnetic Separators
21 models
Crack Detectors
4 models
Magnetic Drill Stands
2 models
Controllers
2 models
Magnetic Mould Clamping
1 model
Magnetisers
1 modelBrowse by application
Know the job but not the product name? Start from what you need to do.
Machining and grinding
Hold steel jobs flat and rigid for surface grinding, milling, drilling and EDM, with nothing in the cutter's way.
Steel plate handling
Lift plates, blocks and billets from stacks, beds and trucks with permanent or electro-permanent magnets.
Material separation
Pull tramp iron out of conveyors, chutes and liquids before it damages crushers or contaminates product.
Mould clamping
Clamp and change injection moulds with electro-permanent plates on both platens.
Fabrication and welding
Hold parts at an angle for welding and assembly, and clamp large weldments with modular magnets.
Inspection and demagnetizing
Find surface cracks by magnetic particle testing, then remove residual magnetism after grinding.
Sarda equipment in use
Installation photographs from Sarda's records, with what each one shows.
Art. 13130
MAGNASLOT magnetic machine bed
- The working face is machined from one block of mild steel; slots form the poles, so there is no filler material.
- Clamp magnetically, or with conventional clamps directly on the chuck.
- Leak-proof, rigid construction that protects the original machine bed.
Art. 23102
EPM-FB plate handling system
- Magnets hang from a fixed-length spreader beam to cover the widest range of plates.
- Double magnetising cycle for safe lifts; magnetic power variable in four steps.
- Electronic control panel with a standby PCB card.
Art. 21101
e-LIFT permanent lifting magnet
- High-energy NdFeB magnets make it smaller and lighter than earlier lifters.
- Every lifter is tested to three times its rated capacity.
- Rated capacities from 100 kg to 5000 kg; no power supply needed.
Why engineers choose Sarda
Six reasons that come from how the group is built, not from slogans.
Our journey since 1958- Since 1958
Four generations of magnet making
A family business that began at Kalyani near Kolkata and is now led by the fourth generation of the Sarda family.
- Own units
Designed, built and tested in-house
Manufacturing in Kolkata, a 100% export-oriented unit in Hyderabad since 1999, R&D at Sodepur since 2009 and units at Sri City since 2017.
- 20+
Patented electro-permanent technology
First patent in 2000; two granted and more than five applied for. More than 20 new technologies developed since 2009, including the patented DoubleMAG.
- To order
Engineered around your job
Special V-profile chucks, custom DoubleMAG modules, telescopic plate handling systems, and magnets in other sizes and voltages on request.
- Export
Proven in demanding markets
Chucks, lifters and tools exported to the USA, Germany, Italy, Australia and Singapore.
- ISO 9001
Certified quality
An ISO 9001:2008 company. KALYANI chucks meet IS 4816 and are supplied as original equipment on many surface grinding machines.
Permanent, electro or electro-permanent?
The three technologies behind every Sarda lifter and chuck, with the documents to go deeper.
| Property | Permanent | Electro | Electro-permanent |
|---|---|---|---|
| Switching | Manual lever on the magnet | Remote switch | Remote switch |
| Power use | None | Continuous while holding | A pulse of about 2 seconds to switch on, and again to switch off |
| If power fails | Not affected | Load drops unless battery backup is fitted | Load stays held |
| Capacity | Up to 5000 kg (e-LIFT range) | Any size | Any size |
| Best for | Shop-floor lifting where the operator can reach the magnet | Scrap and high air gaps | Plates, blocks and billets on cranes; not for scrap |
Which magnetic chuck should I use for thin workpieces?
How much holding force will a magnetic chuck give?
It depends mostly on the workpiece. On a standard chuck the best practical grip is about 17 kg/cm² for mild steel, 8 kg/cm² for cast iron and only 2 kg/cm² for SS 410/420. A ground face gives about 85% of the force a lapped face does; an as-cast face about 25%. Our chuck selection guide covers all five factors.
Can I mill and drill on a magnetic chuck, not just grind?
What happens to an electro-permanent lifter if the power fails?
The load stays held. An electro-permanent magnet needs power only for a pulse of about two seconds to switch on and again to switch off. An electro magnet needs power the whole time it holds, so it drops the load if power fails unless battery backup works. See the lifting magnet guide.
How do I size a lifting magnet for thin plate?
Derate for thickness. A magnet lifts its full rating on solid plate over 50 mm thick, and only about 60% at 25 mm. For long, thin plate use several smaller magnets on a spreader beam: a 6000 × 2000 × 12 mm plate needs at least four sets on a 4000 × 1000 mm beam.
Why are my parts still magnetised after grinding?
Do you make custom magnets?
Yes. Sarda has built special V-profile electro-permanent chucks, custom DoubleMAG modules and telescopic plate handling systems, and makes magnets in other sizes and operating voltages on request. Send your job details with a quote request.
How do I get prices and size charts?
Add the models you need to your quote list and send the request. Our sales engineers reply with the size chart, lead time and price for your quantity.
From the blog
How to choose a magnetic chuck: five factors that decide the grip
Contact area, surface finish, material, heat treatment and thickness decide how much of a chuck's force reaches the job.
Permanent, electro or electro-permanent: how to choose a lifting magnet
How the three lifting technologies compare, and how to derate a magnet for thin or long plate.
Residual magnetism after grinding: why it happens and how to remove it
Why hardened parts stay magnetised, and which demagnetizer suits tool rooms, production lines and heavy parts.
Tell us the job. We will size the magnet.
Send the material, dimensions and operation. Our engineers reply with the right model, size and a price.
- Sales
- +91 80175 22702
- Head office
- 33, Brabourne Road, Kolkata 700001