Magnets 101 — The Complete Guide to Magnetics
The beginner-to-engineer introduction: domains, poles, and flux; material families; grade decoding; BH curves; magnetization directions; temperature; coatings; and applications by industry.
Start Here foundations — 11
Magnets 201 — Advanced Magnetics Engineering
The full mathematical treatment: load-line analysis, permeance coefficients, circuit modeling, demagnetization physics, and design calculations for working engineers.
Magnet Terminology Glossary
Every term you'll meet on a datasheet or drawing — Br, Hc, (BH)max, coercivity, permeance, and more — with live search and plain-language definitions.
Knowledge Base
Short, searchable answers to the questions that come in by phone and email every week, each on its own page.
Magnet Buyers Guide
The commercial walkthrough: what to specify, what drives price, and what a good quote looks like before you commit to a supplier.
Magnet Buyers Guide for Engineers
The engineering counterpart to the buyers guide: specifying grade, geometry and tolerance, designing the magnetic circuit, and the failure modes to design out before a part is quoted.
Magnet FAQs
The questions engineers and buyers ask most often, answered in a couple of paragraphs each.
Neodymium Grades & Tolerances
Grade-by-grade Br, Hcj and BHmax with the standard dimensional tolerances a magnet shop will hold without a special request.
Technical Resource Hub
The hub page that groups every technical asset by the problem it solves.
Compliance Document Center
Where to request RoHS, REACH, conflict-minerals and material certifications, and what each document actually certifies.
Case Studies
Real applications, with the constraint that drove the design and the magnet that solved it.
Interactive Tools hands-on — 29
Search Our Inventory
Dimension-aware search across 10,000,000+ stock magnets — type sizes in inches or millimeters, fractions or decimals, with grades, shapes, and coatings understood natively.
Maggie — AI Magnet Search
Describe the magnet in plain language and Maggie finds the closest stock parts, with pull force and dimensions.
How to Use Maggie
How to phrase a search so Maggie returns the part you actually want.
Magnet Designer / Calculator
Design any disc, ring, block or arc, calculate its field and pull force, save the design and send it straight to a quote.
Magnet Calculator / Designer
The quick version: pick a shape, enter dimensions, read the numbers.
Designer How-to-Use Guide
A walkthrough of the designer, field by field, with worked examples.
CAD Download Center
Exact-geometry STEP, STL and DXF plus dimensioned drawings and datasheets, generated in the browser for any disc, ring or block.
RFQ Builder
Build a complete, quotable RFQ for a single part, field by field, so nothing comes back as a question.
Bulk RFQ
Paste a list of parts and quantities and get one consolidated quote back.
Pull Force Calculator
Holding force against steel, and force at an air gap, for any stock or custom geometry.
Magnet Size Selector
Work backwards from the force you need to the smallest magnet that delivers it.
Magnet Grade Selector
Narrow to a grade from operating temperature, required flux and corrosion environment.
Temperature Derating Calculator
Reversible loss at temperature, so you size for the hot case rather than the bench.
Demagnetization & Permeance
Permeance coefficient and operating point on the demagnetization curve, with a warning before the knee.
Field-at-Distance Calculator
On-axis flux density at any standoff — the number behind a Hall working gap or a reed actuation point.
Magnetic Unit Converter
Gauss, tesla, oersted, A/m, MGOe and the rest, converted both ways.
Magnetic Coupling Torque
Transmitted torque for a coaxial coupling from pole count, gap and magnet geometry.
Hall Sensor Air Gap Designer
Size the magnet and gap to land inside a sensor’s operate and release window across temperature.
Multipole & True Radial Ring
See the pole pattern and surface field of a multipole or true radial ring before you commit to tooling.
Arc & Segment Rotor Calculator
Arc geometry, segment count and gap for a surface-mounted rotor.
Halbach Array Visualizer
Watch the field concentrate on one face as you change segment count and rotation.
Ring-on-Shaft Fit & Stress
Interference, thermal growth and hoop stress for a ring magnet pressed onto a shaft.
Magnet-to-Magnet Force Calculator
Attraction and repulsion between two magnets at any separation, including the stiffness figure suspension and coupling work depends on.
Pot Magnet Force Calculator
Holding force for cup, channel and pot assemblies, where the steel around the magnet does much of the work.
Magnetic Shielding Calculator
How much steel it takes to bring stray flux under a target at a given distance — sizing a shield without guessing.
Tolerance Stack-Up Calculator
Worst-case and RSS stack-up across a magnet assembly, so the air gap still holds when every part is at its limit.
Magnet Should-Cost Calculator
Build up a should-cost from material, tooling, plating and volume before you open a negotiation.
Shipping Compliance Checker
Screen a shipment against UN 2807 and IATA PI 953 before it reaches the dock.
Lead-Time Estimator
Realistic ship date for a given quantity, grade and coating.
Buying & Sourcing procurement — 7
How to Prepare a Magnet RFQ
The specification checklist that gets accurate quotes back fast — dimensions, grade, coating, magnetization, tolerances, and the details suppliers actually need.
Magnet Pricing Explained
What actually drives magnet cost — material content, tooling, tolerances, coating, order volume — and where a spec change saves real money.
Lead Times, MOQs & Expediting
Realistic lead times by grade and coating, why minimum order quantities exist, and what expediting actually costs.
Tariffs, Duties & Country of Origin
How origin is determined, which duties apply, and what changes your landed cost.
Blanket POs, Consignment & VMI
Blanket purchase orders, consignment and vendor-managed inventory, and when each one is worth the paperwork.
Cost Reduction & Value Engineering
Where the money actually is: grade, geometry, coating, tolerance and packaging, in rough order of savings.
Total Cost of Ownership
Unit price is rarely the whole cost. Freight, duty, inspection, scrap and field failure all belong in the comparison.
Strategy & Planning category management — 9
Magnet Category Strategy
Treating magnets as a managed category: segmentation, supplier count, and where to concentrate effort.
Should-Cost Modeling
The cost build-up behind the calculator, explained line by line so you can defend it.
Rare Earth Price Indexing
Tying a magnet price to an NdPr index, and the mechanics of a fair indexing clause.
Supply Risk & Export Controls
Export controls, concentration risk and the signals worth watching before they become shortages.
Demand Planning & Buffers
Forecasting, buffer sizing and the lead-time reality that makes both necessary.
Supplier Scorecards
What to measure, how to weight it, and how to run the review so it changes behaviour.
Make vs. Buy
Assembling in house versus buying a finished assembly, with the costs that usually get missed.
Rare Earth Recycling
Where recycled feedstock comes from, what it can and cannot go into, and how to ask about it.
Obsolescence Planning
Last-time buys, drop-in alternates and keeping a long-life product supplied.
Quality & Compliance verification — 11
Certificates & Compliance Docs
Certificate of conformance, material certs, RoHS and REACH declarations — what each one proves and when to ask for it.
Incoming Inspection & Acceptance
A practical receiving inspection: what to check, how many, and what to do with a marginal lot.
Tolerances & Acceptance Criteria
Standard versus tight tolerances, and writing acceptance criteria a supplier can actually hit.
How Magnets Are Tested & Measured
Hysteresisgraph, Helmholtz coil, gaussmeter, pull tests, and pole scanning — what each instrument proves, and how to write acceptance criteria that hold up.
Quality Standards & Supplier Audit
What to look for on the floor, and the questions that separate a real manufacturer from a trader.
Second-Source Qualification
Qualifying an alternate without discovering the differences in production.
PPAP for Magnets
What a magnet PPAP package contains and how to get one without a six-month delay.
Shipping Magnetized Material
Packaging, shielding and paperwork for magnetized product moving by ground and by air.
Magnet Handling & Safety
Handling rules by magnet size, pacemaker precautions, safe separation technique, storage, and a complete workplace safety-program checklist.
Magnet Safety Warning
The warning notice that ships with strong magnets: ingestion risk to children, pacemaker and medical device interference, pinch injuries and shipping restrictions.
Magnet Failure Analysis
The four failure families with a symptom → cause → verification diagnostic table — for when a magnet in the field has already lost performance.
Engineering Reference specification — 16
Neodymium Magnet Grades Chart
The N35–N55 property table, temperature-class suffixes decoded, and the grade/class availability matrix — including why "N52SH" doesn't exist.
Magnet Material Comparison
NdFeB vs. SmCo vs. alnico vs. ferrite — strength, temperature, corrosion, and cost, side by side, with guidance on when each one wins.
Samarium Cobalt (SmCo)
Where SmCo earns its price: high temperature, corrosion resistance and a very low thermal coefficient.
Alnico Magnets
Excellent thermal stability and a low coercivity that changes how you design around it.
Ceramic / Ferrite Magnets
The low-cost workhorse: what it gives up in strength it returns in price and corrosion resistance.
Magnetization Directions Explained
Axial, diametric, radial, and multipole — how orientation is set during manufacturing and how to choose the right direction for your application.
Magnets & Temperature
Reversible vs. irreversible losses, maximum operating temperatures by grade class, and how to design for hot (and cryogenic) environments.
Magnetic Shielding & Flux Containment
Steering stray flux away from sensors and electronics with backing plates, cups and shields.
How Neodymium Magnets Are Made
Strip casting through inspection — and how each process step explains the lead times, MOQs, and tolerances you see when buying.
Electromagnets vs. Permanent Magnets
Field control versus zero power: the real trade-offs, where each technology wins, and the electro-permanent hybrids in between.
Pull Force Explained
Air-gap derating, thin-steel saturation, shear vs. normal loads — and a worked example showing how a 20 lb rating becomes a 1.2 lb design load.
Why Magnets Lose Strength
The demagnetization mechanisms — heat, opposing fields, corrosion, shock — with the physics of the BH-curve knee and how to design margin against each one.
Rare-Earth-Free & Reduced-Dy Options
Reduced-dysprosium grades and non-rare-earth options, with an honest account of what you give up.
Magnet-to-Magnet Force
Attraction and repulsion between two magnets, including stiffness for suspension and coupling work.
Eddy Currents & Rotor Loss
Rotor loss, segmentation and why a solid magnet runs hotter than the model predicted.
Machining & Tolerances
What can be ground, drilled or chamfered after sintering, and what it costs.
Design & Assembly integration — 10
Magnet Coatings Compared
NiCuNi, epoxy, parylene, gold and the rest, compared on salt spray hours, thickness and what they cost.
Arc & Segment Magnets
Specifying arcs for rotors and couplings: included angle, radii, magnetization direction and tooling.
Ring & Annular Magnets
ID, OD and thickness, axial versus diametric magnetization, and the wall thickness a ring needs to survive assembly.
Bonding & Mounting Magnets
Adhesive selection, surface prep by coating type, bond joint design, and mechanical retention — so your magnet stays put for the product's life.
Assembly & Retention Design
Keeping magnets in place under heat, vibration and centrifugal load.
Magnets for Sensors
Hall, TMR/AMR, and reed sensor magnet selection: the five sensing configurations, field-at-gap design, and encoder ring specification.
Magnetic Assemblies Guide
Pot, channel, countersunk, and rubber-coated formats — how steel cups multiply pull force 2–4×, and which assembly fits which job.
Halbach Arrays Explained
One-sided flux, dipole cylinders, and rotor rings — how the rotating magnetization pattern works and what it takes to actually build one.
Backing Plates & Pot Cups
How steel behind a magnet multiplies holding force, and how to size it.
EV Traction Motor Magnets
Rotor temperature, demagnetization at fault, grain boundary diffusion, segmentation and retention for traction rotors.
Start With Your Role entry points — 13
Design Engineers
Specification, tolerance and the constraints that decide a magnet before you draw it.
Manufacturing Engineers
Handling, fixturing, assembly and the process risks magnets add to a line.
Quality Engineers
Inspection, acceptance criteria and the documentation to demand from a supplier.
Automation Integrators
Grippers, sensors, latches and end effectors that depend on a magnet behaving predictably.
R&D & Prototyping
Getting from an idea to a testable part fast, without tooling.
NPI Program Managers
Where magnets threaten a launch date, and the long-lead decisions to make early.
Buyers & Purchasing
What to ask for, what to compare, and what a complete quote contains.
Procurement Managers
Supplier strategy, terms and the levers that move a magnet price.
Commodity Managers
Indexing, hedging and managing a rare-earth-exposed category.
Materials Managers
Stocking policy, buffers and keeping a line fed through a long lead time.
Supply Chain Managers
Origin, logistics, export control and shipping magnetized freight.
Compliance Managers
RoHS, REACH, conflict minerals and the certifications customers audit against.
Maintenance & MRO
Identifying, sourcing and replacing a magnet already in service.
By Industry & Application where magnets go — 15
Magnets for Medical Devices
Imaging, surgical instruments and devices where cleanability and traceability matter as much as field.
Magnets for EV & Automotive
Traction motors, sensors and actuators, and the supply questions that come with volume automotive.
Magnets for Industrial Automation
Actuators, position sensing, grippers and conveyors on the factory floor.
Robotics & Cobots
Joints, end effectors and encoders where mass and repeatability both count.
Wind & Renewable Energy
Direct-drive generator rotors and the largest single magnet application there is.
Food Processing & Separation
Separation and contamination control, with the sanitary construction the audit will ask for.
Pumps, HVAC & Magnetic Couplings
Sealless pumps and drives that transmit torque through a containment wall.
Oil & Gas Downhole
Downhole tools where temperature and pressure rule out most of the grade table.
Material Handling & Lifting
Lifting, holding and conveying, and the safety factors that belong in the calculation.
Electric Motors & Rotors
Rotor topologies, grade selection and the thermal margin a motor design needs.
Holding & Latching
Doors, panels, covers and fixtures, sized for the force you actually need.
Magnetic Separators
Plates, grates, drums and traps for pulling tramp metal out of a product stream.
Levitation & Bearings
Passive suspension and magnetic bearings, including the stiffness numbers.
MRI & NMR
Field homogeneity and stability at a level most applications never have to consider.
Speakers & Audio
Motor structures for drivers, where flux density in the gap sets the sensitivity.
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