Alias coverage
0.5 inch
The searched phrase 0.5 inch magnet N50 is answered here as a half-inch N50 disc or block screening case, not as a separate URL.
Check whether an N50 magnet size is plausible, estimate weight and axial pull, then use the report layer to decide grade, coating, test method, risks, and next RFQ inputs.
The phrase 0.5 inch magnet N50 is handled on this single canonical URL. It usually means a half-inch N50 magnet, but the missing shape and thickness must be confirmed before quotation.
Default alias size
12.7 mm
N50 grade marker
48-50 MGOe
Best next step
Sample test
N50 Magnet Quick Check
Defaults are set to a 0.5 inch magnet N50 disc, the alias phrase merged into this canonical N50 magnet page.
Supported range: 1-100 mm face dimension.
Blocks need width; discs reuse diameter.
Supported range: 0.5-50 mm thickness.
Supported range: 1-1,000,000 pieces.
This explicitly covers the alias intent 0.5 inch magnet N50 as a half-inch N50 disc screening case.
Next step: Send these inputs with the warnings below and ask engineering to confirm pull-test setup, temperature margin, and sample validation.
Estimated pull
20.90 lbf
93.0 N, axial pull on clean thick steel
Single magnet weight
3.057 g
Batch weight
1.53 kg
Volume
0.4022 cm3
Conservative shear hold
3.76 lbf
Review before quoting
Alias coverage
0.5 inch
The searched phrase 0.5 inch magnet N50 is answered here as a half-inch N50 disc or block screening case, not as a separate URL.
Grade range
48-50 MGOe
Public N50 data sheets typically place maximum energy product around 48-50 MGOe with residual induction around 14.0-14.5 kG.
Half-inch disc mass
about 3.1 g
A 12.7 mm x 3.18 mm N50 disc weighs roughly 3.1 g using 7.6 g/cm3 sintered NdFeB density.
Decision boundary
Validate fixture
N50 describes material grade. Pull force must still be validated by shape, air gap, steel thickness, coating, temperature, and load direction.
Heat caveat
supplier-specific
Some public NdFeB sheets cap N50/N52 family grades at 60 C, while other data sheets require shape-specific demagnetization review instead of one universal limit.
Use N50 magnets when the assembly needs high room-temperature energy density but does not require the last increment of N52. The alias 0.5 inch magnet N50 is answered here as one intent cluster, not a competing route.
The practical boundary is that N50 is a material property signal, not a final holding-force guarantee. A real RFQ must still define shape, thickness, tolerance, coating, magnetization, target steel, air gap, temperature, and safety factor.
This page uses public supplier technical data and exact unit conversion for screening. It does not claim certified pull force because pull force is an assembly-level test result, not a grade name alone.
These fields turn a searchable part phrase into a buildable procurement specification. Freeze them before pilot or production release.
| Field | Recommended RFQ wording | Why it matters |
|---|---|---|
| Shape and size | State 0.5 inch diameter x thickness for discs, or L x W x T for blocks | The alias phrase does not define thickness or shape. A supplier cannot quote a stable part from grade and half-inch size alone. |
| Grade | N50 with data sheet, property range, and lot traceability | N50 should map to Br, Hcb, Hcj, and BHmax. It should not replace a finished-part pull-force requirement. |
| Magnetization | Axial through thickness for common discs unless diametric or multipole is required | Magnetization direction changes the usable field, fixture design, inspection method, and lead time. |
| Temperature | State continuous and peak temperature; ask for H/SH/UH review if duty can exceed normal room-temperature screening | Public supplier sheets differ on N50 heat limits. Some list 60 C for N50/N52 family grades, so the RFQ should not hide thermal duty. |
| Validation | Define target steel thickness, air gap, pull direction, fixture, speed, temperature, and pass value | Catalog pull numbers cannot be compared unless the test condition is known. |
| Regulatory scope | State whether the magnet is industrial-only, consumer-accessible, toy-related, jewelry-related, or educational | U.S. consumer magnet rules and toy standards use scope, separability, small-parts fit, and flux index. Industrial use should be documented. |
Heat is the largest unresolved decision gap for a compact N50 magnet. Public sources do not give one universal maximum operating temperature for every N50 shape: one supplier sheet explicitly caps N50/N52-family grades at 60 C, while another publishes N50 thermal coefficients and demagnetization curves with product shape and size caveats. Use the table below to decide when evidence is sufficient and when the conclusion must stay pending.
| Condition | Decision action | Evidence boundary |
|---|---|---|
| Room-temperature latch, fixture, or sensor trigger | Screen N50 normally, then validate pull or field with the actual steel, gap, and coating. | Public N50 sheets support high room-temperature energy density, but not a finished-part pull guarantee. |
| Continuous heat above roughly 60 C | Do not rely on generic N50 wording. Ask for N50H/N50SH or a lower-energy high-coercivity grade review. | Eclipse/Bunting sheets explicitly rate N50/N52 family grades to 60 C, while Arnold publishes temperature coefficients and shape-dependent demagnetization curves. |
| Thin disc, large air gap, or weak magnetic circuit | Require irreversible-loss review before approving samples, even if ambient temperature seems moderate. | Arnold notes material properties and demagnetization curves can vary with product shape and size. |
| Temperature data unavailable from supplier | Mark as pending evidence. Freeze bulk order only after supplier data sheet, sample aging, or hot pull test. | No reliable public data can replace buyer-specific geometry and operating-point validation. |
A reliable N50 RFQ separates material evidence from finished-part evidence. This prevents a grade certificate from being misread as a guaranteed latch force or consumer-safety approval.
| Layer | Proves | Does not prove |
|---|---|---|
| Material certificate | Grade-property range such as Br, Hcb, Hcj, and BHmax | Finished pull force, corrosion life, adhesive retention, or hot assembly behavior |
| Dimensional inspection | Diameter, length, width, thickness, chamfer, coating build, and tolerance compliance | Magnetization direction, field map, or target-steel holding force |
| Pull or field test | Performance under the stated steel thickness, air gap, probe position, pull direction, and speed | Performance after a different coating, bracket, temperature, or shear load path is introduced |
| Consumer safety review | Whether the product falls inside or outside consumer magnet rules, toy rules, labeling, and retention requirements | Industrial exemption unless marketing channel and end-user restriction are documented |
Scenario 1
Assumption: 12.7 mm face, low load, bracket gap controlled, room-temperature operation.
Action: Use the half-inch default to screen size and mass, then validate field strength at the Hall or reed-switch position.
Expected result: N50 can be sensible when field margin matters more than pull force, but magnetization direction must be frozen.
Scenario 2
Assumption: User cares about holding force and the mating plate may be painted or thin.
Action: Run the calculator with the gap or thin-sheet condition, then prototype a cup, channel, or steel return path.
Expected result: A lower grade in a magnetic assembly may outperform a bare N50 disc at lower total risk.
Scenario 3
Assumption: Compact half-inch envelope, peak heat or continuous heat not yet measured.
Action: Treat standard N50 as pending evidence and request N50H/N50SH options plus irreversible-loss assumptions.
Expected result: A high-coercivity grade may be safer even if its room-temperature pull looks similar or slightly lower.
Scenario 4
Assumption: Loose or separable magnet can be reached by the user and may fit the small-parts cylinder.
Action: Check CPSC scope, flux-index testing, retention design, and warnings before sourcing samples.
Expected result: Do not quote as a routine industrial part unless the channel, use case, and safety obligations are resolved.
N50 is often the right answer only when geometry is compact and the assembly is room-temperature. The table below shows when a different design move can beat a higher grade.
If yes: N50 is a credible high-grade option, but thickness, coating, and pull test still decide whether it works.
If no: Compare N42/N45/N50 with a larger geometry because added volume can be cheaper than a higher grade.
If yes: Review high-temperature grades, operating point, and irreversible-loss margin instead of assuming standard N50 is enough.
If no: N50 can be screened for room-temperature latches, fixtures, and sensor packages, but final pull still needs a fixture test.
If yes: Add a mechanical pocket, stop, cup, or adhesive validation. Axial pull estimates do not prove shear holding.
If no: Use axial pull screening, then validate against the real mating surface and gap.
If yes: Treat ingestion, pinch, labeling, retention, small-parts fit, flux-index testing, and regulatory review as design requirements before sourcing.
If no: Industrial projects still need handling controls, separation packaging, and documented channel restrictions.
| Option | Best for | Tradeoff |
|---|---|---|
| N50 magnet | Compact room-temperature assemblies needing high energy density | Slightly lower peak grade than N52, but often easier to source and cost-balance |
| N52 magnet | Maximum room-temperature strength when the envelope cannot grow | Higher cost and no automatic fix for heat, air gap, or steel saturation |
| N42/N45 magnet | Cost-sensitive fixtures where diameter or thickness can increase | Lower energy product; may need a larger magnet or steel return path |
| Cup or channel assembly | Holding tasks where usable pull matters more than bare magnet grade | Adds steel hardware, changes corrosion design, and must be tested as an assembly |
Impact: 0.5 inch magnet N50 does not specify shape, thickness, coating, or magnetization direction.
Mitigation: Normalize the alias to a canonical N50 magnet RFQ and confirm drawing units before quote.
Impact: Air gap, target steel, coating, temperature, and shear loading can sharply reduce usable force.
Mitigation: Use the quick check for screening, then request a sample pull test with the real mating surface.
Impact: A lower grade or larger geometry may meet the requirement at lower cost.
Mitigation: Ask for N42/N45/N50 comparison when envelope or tolerance can change.
Impact: Sintered NdFeB is brittle and corrosion-sensitive; chipped edges can reduce contact area and coating life.
Mitigation: Specify coating, chamfer, visual acceptance, and corrosion testing based on the environment.
Impact: Half-inch high-powered magnets can be pinch, ingestion, electronics, and shipping hazards.
Mitigation: Define retention, warning labels, packaging separation, and product-safety review before production.
Impact: A compact N50 magnet can lose margin when heat, thin geometry, or an open magnetic circuit lowers the working point.
Mitigation: Request supplier irreversible-loss review, hot pull testing, or a high-coercivity grade before approving sustained-heat duty.
Impact: A consumer-facing product with loose or separable magnets may fall under CPSC magnet rules even if the magnet is purchased from an industrial supplier.
Mitigation: Document intended use, sales channel, product scope, small-parts fit, flux-index result, and retention method.
Updated June 6, 2026. The conclusions above use public supplier data, standards pointers, and safety resources. Where the final value depends on a buyer-specific fixture, the page marks the result as screening guidance rather than certified data.
Used for N50 property range and density screening values. Accessed June 6, 2026.
Used for selection caveats around temperature, geometry, cost, and application constraints. Accessed June 6, 2026.
Used to frame magnetic-property measurement and permanent-magnet material specifications. Accessed June 6, 2026.
Used for the explicit 60 C caveat on N50/N52-family grades and temperature-coefficient table. Accessed June 6, 2026.
Used for consumer magnet scope, October 21, 2022 manufacture-date applicability, small-parts fit, and flux-index boundary. Accessed June 6, 2026.
Used for exact inch-to-millimeter conversion. Accessed June 6, 2026.
No. It is merged into the canonical N50 magnet page because the alias intent is the same buyer question: how to screen, specify, and quote an N50 magnet around a half-inch size.
N50 is a high-energy sintered NdFeB grade. Public data sheets commonly place maximum energy product around 48-50 MGOe, but finished performance still depends on geometry, temperature, coating, and magnetic circuit.
N50 is usually slightly below N52 in maximum energy product. In real assemblies the difference may be smaller than the effect of air gap, target steel, thickness, coating, or temperature.
0.5 inch equals 12.7 mm. Thickness is not defined by the alias, so RFQs should state diameter x thickness for discs or length x width x thickness for blocks.
No. The calculator is an RFQ preparation tool. Guaranteed pull force requires a controlled test method, target steel, air gap, coating, temperature, and magnetization direction.
Ni-Cu-Ni is common for indoor use. Epoxy, zinc, or other coatings should be reviewed when corrosion, salt spray, adhesive bonding, or handling damage is expected.
Avoid standard N50 when sustained heat, high impact, high shear, consumer access, or corrosion exposure is unresolved. Some public supplier sheets cap N50/N52-family grades at 60 C, so hotter duty should trigger high-coercivity grade review.
Send shape, dimensions, tolerance, grade, coating, magnetization direction, quantity, destination, operating temperature, mating surface, pull-test requirement, and packaging constraints.
No. N50 identifies material grade only. Axial, diametric, radial, or multipole magnetization must be stated separately.
Yes. Customization depends on shape, thickness, tolerance, coating, chamfer, magnetization fixture, inspection plan, and order quantity.
They may use different steel plates, air gaps, test fixtures, magnetization directions, coating assumptions, and safety factors. Compare test conditions before comparing numbers.
Send the normalized dimensions and application conditions for engineering review, then validate samples against the actual mating surface before production purchase.
There is no universal public limit that applies to every shape and operating point. Eclipse/Bunting public sheets state N50/N52-family grades are rated to 60 C, while Arnold publishes N50 temperature coefficients and demagnetization curves with shape-and-size caveats. Treat sustained heat as pending evidence until the supplier reviews irreversible loss.
They can apply when the product is a consumer magnet product with loose or separable magnets. CPSC guidance for 16 CFR Part 1262 uses scope, small-parts cylinder fit, and a flux-index threshold. Industrial-only products should document channel and end-use restrictions rather than assuming exemption.
Material grade should be backed by a data sheet or material certificate covering Br, Hcb, Hcj, and BHmax under defined methods such as IEC 60404-5. That does not prove finished pull force; pull needs a separate fixture test.
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