NdFeB Magnet Tolerances: Dimensional Specs, Surface Finish, and What to Put on Your Drawing
Standard sintered NdFeB tolerances are +/-0.05 mm on ground dimensions and +/-0.1 mm on as-sintered surfaces. Tighter specs are achievable but cost real money. This guide maps tolerance grades to manufacturing processes, explains what actually drives cost, and shows how to write a magnet drawing that gets you accurate quotes.
NdFeB Thermal Demagnetization: Temperature Limits and Grade Selection for EV and Robotics Motors
Every NdFeB grade has an irreversible demagnetization knee that shifts upward with temperature. Cross that knee during a hot-cell torque test or a stalled rotor event and the magnet loses flux permanently. This guide maps the thermal ceiling for each grade family, explains how to read a demagnetization curve at operating temperature, and shows where H, SH, UH, and EH grades earn their price premium.
NdFeB Magnet Segmentation: Cutting Eddy-Current Losses in EV and Humanoid Motors
Sintered NdFeB has a resistivity of roughly 140 microhm-cm, so a solid magnet inside a high-frequency rotor field acts like a shorted secondary. The fix is axial and circumferential segmentation, but the segmentation that actually works is narrower than the textbook suggests. Here is how to specify it in an RFQ, what it costs, and where the thermal feedback loop breaks down without it.
Section 301 25% Tariff on Chinese NdFeB Magnets: What US Buyers Should Price Into 2026 Quotes
On 1 January 2026 the longstanding Section 301 exemption for permanent magnets ended. Imports of NdFeB and SmCo magnets from China now carry an additional 25% USTR duty on top of the 2.1% MFN base rate. Here is how to read the tariff stack, run a landed-cost example, and structure 2026 POs so the duty stops being a surprise.
Rare Earth Market Update: May 2026 — NdPr Pricing, MOFCOM Licensing, and Western Supply
NdPr oxide opened 2026 at $53/kg and crossed $135/kg in late April — up roughly 155% YTD. MP Materials produced its first commercial-scale magnets, Neo Estonia commissioned its HREE line, USA Rare Earth ramped Stillwater, and the MOFCOM suspension clock is now six months from expiry. Here is what that means for procurement teams in the next 30–60 days.
EU Critical Raw Materials Act: What 2026 Compliance Means for OEMs Sourcing NdFeB Magnets
The Council adopted its CRMA position in March 2026. The Commission has until November 2026 to set the magnet label format, and by May 2027 any product containing more than 0.2 kg of permanent magnets must disclose recycled-content shares for eight specified elements. Here is what European OEMs and their tier-1s need to do now to be ready.
NdFeB Magnets for US Humanoid Robotics: Figure, Tesla Optimus, Agility Digit, and the 2026 Supply Chain Reality
Tesla hit 1 million Optimus Gen 3 units/year capacity at Fremont in March 2026. Figure's BotQ facility is tooled for 12,000 Figure 03 units/year. Agility Digit is working in Amazon warehouses. Here is what engineers actually need to know about the magnets inside these machines and how to source them for US production programs.
How US and European Tier 1 Suppliers Qualify Chinese NdFeB Magnet Manufacturers: The 2026 Playbook
Tier 1 automotive, robotics, and industrial procurement teams have tightened qualification criteria since 2024. This is the practical, step-by-step playbook for qualifying a Chinese magnet manufacturer to production status — the documentation, the audits, the red flags, and the timeline that actually holds.
NdFeB vs SmCo Magnets: Which Rare Earth Material to Choose for Your Motor, Actuator, or Sensor
Sintered NdFeB and SmCo (samarium-cobalt) are the two commercial rare earth magnet materials. They overlap substantially in use cases but win in different envelopes. This is a practical decision framework with real specification data — not a materials-science lecture.
China Rare Earth Export Controls in 2026: MOFCOM Licensing, the November Cliff, and How to Keep NdFeB Magnet Shipments Moving
The November 2025 suspension did not end export licensing. The April 2025 rules remain fully in force, NdPr prices jumped 37% in April 2026, and the suspension window expires November 10, 2026. Here is what procurement teams need to know about MOFCOM licensing for NdFeB magnets right now.
NdFeB Magnet Coatings Compared: NiCuNi vs Epoxy vs Zinc vs Parylene — Specification Guide with Salt Spray Data
The coating you choose affects corrosion life, bond strength, cost, and whether your magnet survives the environment it is going into. A practical engineering framework for selecting NdFeB coatings, with real test data and decision rules.
Sintered vs Bonded NdFeB Magnets: How the Two Processes Differ and When to Use Each
Sintered and bonded NdFeB are often lumped together under the same 'neodymium magnet' label, but they are made by completely different processes and deliver very different performance. Here is how to tell them apart and pick the right one for your application.
Factory-Direct vs Trading Company: How to Verify Your NdFeB Magnet Supplier Actually Makes Magnets
A large share of the 'magnet manufacturers' procurement teams find online are trading companies. The difference matters for price, lead time, quality control, and export compliance. Here is how to tell them apart and why it matters more in 2026 than it used to.
NdFeB Magnets in EV Traction Motors: Grades, Specifications, and What Engineers Need to Know
Every major EV traction motor uses NdFeB magnets embedded in an IPM rotor. Here is what goes into specifying those magnets correctly - from grade selection to thermal management to the role of GBD in reducing cost.
US Domestic Rare Earth Magnet Production Is Here - What It Means for Buyers in 2026
USA Rare Earth just shipped its first commercial NdFeB magnets from Oklahoma. MP Materials is building in Texas. Here is what domestic production actually delivers today, what it does not, and how procurement teams should factor it into their sourcing strategy.
NdFeB Magnet Pricing in 2026 - What Buyers Should Expect and How to Plan
NdFeB magnet prices are up 30-50% year-over-year. Here is what is driving the increase, where prices are headed, and what procurement teams can do to protect their budgets.
NdFeB Magnet Grades Explained - N35 to N55 and What the Letters Mean
Every NdFeB magnet grade tells you exactly what to expect from it - if you know how to read the naming convention. Here is the practical breakdown engineers actually need.
From Spring Festival Gala to Factory Floor: The Magnets Powering China's Humanoid Robot Boom
In 2025, Unitree's H1 robots danced on CCTV's Spring Festival Gala. In 2026, even more humanoid robots took the stage. Behind every fluid joint movement is a precision magnet - here's what's actually inside these machines.
How to Choose a Neodymium Magnet Supplier for Robotics and Servo Motors
A practical guide for robotics engineers and procurement teams evaluating magnet suppliers. What to look for, what to avoid, and why the right supplier is a competitive advantage.
Radial Multi-pole Rings vs. Segmented Arc Magnets: Which Is Better for Your Motor?
A technical comparison of the two dominant magnet architectures for BLDC and PMSM motors. Performance data, cost trade-offs, and application guidance.
Magnets for Collaborative Robots (Cobots): Requirements, Grades, and Supplier Selection
Cobots are the fastest-growing segment in industrial robotics. Here's what cobot manufacturers need from their magnet supply chain.
GBD Magnets Explained: How Grain Boundary Diffusion Cuts Costs Without Cutting Performance
Grain Boundary Diffusion is the most important magnet manufacturing innovation in a decade. Here's how it works, why it matters, and how it saves robotics, EV, and aerospace programs money.
The Complete Guide to Magnets for Humanoid Robot Actuators
Everything a robotics engineer needs to know about specifying, sourcing, and testing magnets for humanoid robot joint motors. From grade selection to incoming inspection.
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