Wide Surface Area, High-Grade N52 We supply large neodymium block magnets for your application. Include heavy-duty magnet fishing, salvage operations, industrial retrieval, etc. Standard round “pot magnets” usually come with a small spot. A large NdFeB block magnet (e.g., 100mm or 150mm length) can act as a magnetic sweeper. When dragged behind a boat or from a bridge, its wide profile covers more ground with every pass. This maximizes the chance of snagging scrap metal, tools, or safes from the bottom of waterways. Why Use a Block for Fishing? The block shape offers a distinct advantage for serious salvage operations. 1. The “Wide Path” Advantage: The Physics: A round magnet captures debris at a single point. A long rectangular block creates a “magnetic line.” The Benefit: Ideally suited for Trawling. By orienting the block perpendicular to the drag direction, you increase your sweep width by 300-400% compared to a disc magnet. 2. Multi-Face Attraction: The Benefit: Unless encased in a steel cup, a raw block magnet emits force from both large faces. This means it doesn’t matter if the magnet flips over underwater; it stays active on both sides. Durability Advisory: Protection is Mandatory A raw Neodymium block is brittle. It cannot survive underwater impact alone. 1. The “U-Channel” Solution: We strongly recommend that these large blocks be mounted inside a Stainless Steel U-Channel or casing. Why: If a raw 100mm block hits a rock underwater, it will shatter. A steel channel protects the brittle corners while focusing the magnetic field downwards (increasing vertical pull force). Our Service: We can supply the magnet with Countersunk Holes to bolt securely into your protective housing. 2. Anti-Corrosion Strategy: The Risk: River water is corrosive. Standard Nickel plating may eventually peel if scratched by rocks. The Solution: For dedicated fishing blocks, we recommend Epoxy Coating (Black) or Rubberizing (after assembly). Such coatings provide a waterproof shock-absorbing layer. Manufacturing Capabilities Dimensions: – Length: Custom up to 200mm (for wide drag bars). – Thickness: Up to 50mm (for deep magnetic reach). – Mounting: We can machine Countersunk Holes (M8, M10) directly into the magnet block for attaching eye-bolts. Material Grade: N45 – N52: We recommend the highest grades. Ensure the magnet is strong enough to pull heavy objects through deep silt or mud. Ideal Applications Magnet Fishing: Dragging rivers and canals for scrap metal and relics. Industrial Tank Cleaning: Dropped tool retrieval in large dip tanks. Conveyor Sweepers: Hanging above conveyor belts to catch tramp iron. Marina Cleanup: Recovering keys and tools dropped from docks. Ordering Guide: Build Your Rig To supply the right block, we need to know your mounting plan: 1). Dimensions: Length x Width x Thickness. 2). Mounting Style: – Solid Block: (You will build a cage for it). – Countersunk: (You need holes to bolt an eyelet directly through it). 3). Hole Count: “One central hole, or two holes (one at each end) for stability?” 4). Coating: Ni-Cu-Ni (Standard) or Epoxy (Black/Salt Resistant). Packing Method It is important to guarantee safe transit for big NdFeB magnets. And comply with international IATA and IMDG regulations. We follow a 3-stage shielding method for all large neodymium shipments. 1). First, we put the magnets in dense foam to create a protective air gap. 2). Then, line the shipping cartons with steel plates to securely contain the intense magnetic flux. When shipping multiple pieces, we will alternate pole alignments. Neutralize stray magnetic fields. Insert sturdy spacers between the magnets. This way, we can ensure safe, pinch-free separation upon unpacking. 3). Finally, every package will undergo stringent field-strength testing before sending to shippers. Follow these 3 essential steps, we can guarantee such big strong magnets pass airline safety standards. And assure a secure and hassle-free delivery to you.