Alias coverage
1/2 in cube
The searched phrase 1 2 in cube neodymium magnets is answered here as a 1/2 inch neodymium magnet cube, about 12.7 mm per side.
Start with the cube quick check, then use the report layer to decide whether a 1/2 inch neodymium magnet cube is practical for pull, field, coating, safety, and production handling.
The alias phrase 1 2 in cube neodymium magnets is normalized here as a 1/2 inch cube, about 12.7 mm per side, so the tool, RFQ wording, and evidence use the same size.
Alias size
1/2 in
Metric side
12.7 mm
Best next step
Sample test
Cube Magnet Quick Check
Defaults are set to 1/2 inch cube neodymium, normalized from the searched phrase 1 2 in cube neodymium magnets.
This explicitly answers the 1 2 in cube neodymium magnets query as a 1/2 inch cube, about 12.7 mm per side.
Estimated axial pull
103.02 N
23.16 lbf on clean thick steel
Single cube weight
15.5677 g
Batch weight
15,567.7 g
Volume
2.04838 cm3
Conservative shear hold
18.54 N
Screened surface field
4,200 G
Grade model
N52
Pull is not certified
Use a fixture with defined steel, gap, pull direction, speed, and temperature before approving production.
Safety is separate
Consumer-accessible magnets need scope, retention, small-parts, and flux-index review outside this calculator.
Shipping is package-level
Bulk magnetized lots may need shielding and external-field screening before postal or air routing.
Alias size
1/2 in
Metric side
12.7 mm
Best next step
Sample test
Alias coverage
1/2 in cube
The searched phrase 1 2 in cube neodymium magnets is answered here as a 1/2 inch neodymium magnet cube, about 12.7 mm per side.
Default mass
15.56 g
Using 7.6 g/cm3 sintered NdFeB density, a 1/2 inch cube weighs about 15.56 g before coating and inspection variance.
Typical Pull Force (N52)
≈ 23 lbs (10.5 kg)
Against a thick flat steel plate, a 1/2 inch N52 cube generates roughly 23 lbs of pull force. Air gaps or thin steel will reduce this drastically.
Handling risk
Severe pinch & collision
With high mass (15.56 g) and >20 lbs pull force, these cubes will leap and shatter if allowed to collide, sending dangerous shrapnel.
Decision boundary
sample first
A cube magnet estimate helps RFQ screening. It does not replace pull, flux, separation, coating, and safety validation on the real assembly.
A neodymium magnet cube is useful when a square pocket, polarity orientation, or compact local field matters more than catalog pull force. The 1 2 in cube neodymium magnets query is best handled on this hybrid page because the buyer still needs the same cube sizing, grade, coating, and validation decisions.
The fast answer is that a 1/2 inch cube is physically plausible, but it is not a micro part. The business answer is that packaging, pinch/shatter controls, polarity control, coating quality, and safety review can matter more than raw magnet price.
If the requirement is a round format instead, compare the N52 disc magnet calculator before changing a square assembly pocket into a disc design.
The calculator uses exact unit conversion, cubic volume, public NdFeB density, grade-relative screening factors, and contact condition discounts. It is intentionally conservative about claims: no public page can certify a finished pull value for your target steel, coating, gap, and fixture.
| Evidence item | Value used | Source and boundary |
|---|---|---|
| Typical pull force (N52) | ≈ 23.16 lbs on thick steel | K&J Magnetics B888-N52 (1/2" cube) pull force data (Case 1), accessed July 27, 2026. |
| Consumer magnet threshold | Flux index for 1/2" N52 cube is > 5,000 kG²·mm² (CPSC limit is 50) | Calculated from ~6 kG surface field and 161.29 mm² pole area. 16 CFR Part 1262 limits flux index to < 50 for separable magnets in covered products. |
| 1/2 inch normalization | 1/2 in = 0.5 in = 12.7 mm | Exact inch-to-mm conversion using 25.4 mm per inch. |
| Mass screening | Cube volume x 7.6 g/cm3 density | Arnold Magnetic Technologies N52 data sheet lists 7.6 g/cm3 density for sintered NdFeB screening; lot mass should use supplier inspection data. |
| N52 grade strength | BHmax 49-53 MGOe; typical Br around 14.2-14.8 kG | Arnold Magnetic Technologies N52 data sheet, Rev. 210802, accessed June 10, 2026. |
| Grade selection limit | Temperature, geometry, application requirement, and cost must be checked | Dura Magnetics N52 technical note on selection caveats, accessed June 10, 2026. |
| Standards boundary | Grade names map to material-property ranges, not guaranteed finished assembly pull force | MMPA permanent magnet guidelines and public supplier data sheets, accessed June 10, 2026. |
| Safety boundary | Small high-powered magnets can create ingestion and pinch hazards in consumer-accessible products | U.S. CPSC magnet safety resources and magnet rule guidance, accessed June 10, 2026. |
| Consumer magnet threshold | Hazardous magnet = fits small-parts cylinder and flux index >= 50 kG2 mm2 | 16 CFR Part 1262 definitions for subject magnet products, accessed June 10, 2026. |
| Measurement standard boundary | IEC 60404-5:2015 covers permanent magnet material property measurement, not finished-assembly pull | IEC 60404-5:2015 webstore scope statement, accessed June 10, 2026. |
| Mail and air transport screen | FAA PackSafe states magnets above 0.00525 gauss at 15 ft from the package or magnet cannot fly | FAA PackSafe - Magnets, last updated March 15, 2023; accessed June 10, 2026. |
Use these internal references when the 1/2 inch cube assumption changes during engineering review, grade selection, or supplier comparison.
Keep the searched alias on the research brief, but write the purchasable requirement as 1/2 inch cube neodymium magnet or 12.7 mm cube on drawings, RFQs, and sample approvals.
Send drawing detailsThe 1/2 inch alias creates a substantial magnet: a cube with roughly 2,048 mm³ volume and about 15.56 g mass. A thousand pieces weigh over 15.5 kg (34 lbs) before trays, bags, separators, and heavy-duty packaging are added.
That scale means handling changes dramatically. Instead of losing micro-size magnets in packaging, the primary risks are magnets shattering upon impact with each other or pinching fingers during manual assembly.
Use it when
Avoid it when
| RFQ field | Recommended wording | Why it matters |
|---|---|---|
| Size wording | Write 1/2 in cube or 12.7 mm cube; avoid bare 1 2 in cube neodymium magnets on a PO | The alias is understandable to search engines but ambiguous in procurement records. |
| Tolerance | State side tolerance, coating build, chamfer, and burr/chip rules | On a 12.7 mm cube, coating build is a small dimensional fraction, but tolerance, chamfer, burrs, and edge chips still decide fit and durability. |
| Grade | N35, N42, or N52 with a supplier data sheet and lot traceability | Higher grade helps only if heat, air gap, and mating steel are not the bottleneck. |
| Magnetization | Define axis through one pair of faces, plus pole marking if assembly orientation matters | Cubes can be assembled in several orientations; wrong polarity can break the finished product. |
| Coating | Ni-Cu-Ni for indoor samples; epoxy, zinc, or passivation only after exposure review | Sintered NdFeB corrodes if coating is damaged. Micro cubes also need handling-safe packaging. |
| Validation | Define pull or field test fixture, target steel, gap, temperature, and sample count | A catalog grade cannot predict buyer-specific force without a defined magnetic circuit. |
A 1/2 inch cube can look harmless because it is small, but several decisions are measured at a different level: consumer rules can use flux index, postal and air routing can use package-level field, and engineering acceptance should use the buyer's real pull or field fixture.
| Decision question | Public boundary | RFQ action |
|---|---|---|
| Is the cube an industrial component? | CPSC business guidance excludes products sold solely to school educators, researchers, professionals, and commercial or industrial users from the subject magnet product scope. | Keep the product-use statement on the RFQ and purchase order; do not market leftover magnets as desk toys, stress-relief products, jewelry, or entertainment items without a separate compliance review. |
| Could users access loose magnets? | 16 CFR Part 1262 focuses on separable magnets in covered consumer products; it defines hazardous magnets using small-parts-cylinder fit and flux index >= 50 kG2 mm2. | Treat separability as a design-control question: potting, welding, overmolding, staking, adhesive qualification, and abuse testing can matter more than nominal cube size. |
| Can it ship by air or post? | FAA PackSafe gives a package-level field boundary for aircraft carriage; the rule is about measured field outside the package, not only the magnet part number. | Ask for package-level gaussmeter screening and shielding confirmation when shipping bulk lots, magnetized assemblies, or tray-packed arrays. |
| Does a grade data sheet certify pull? | IEC 60404-5 is a material-property measurement standard. It does not define buyer-specific pull force through paint, adhesive, thin steel, or a plastic pocket. | Define the pull or field fixture in the RFQ: steel grade, steel thickness, gap, pull direction, speed, temperature, and acceptance sample count. |
At this scale, the nominal side length dominates. Unlike micro-magnets, coating build is a negligible fraction of a 12.7 mm side. However, machining variance, burr control, and adhesive pocket clearance still decide whether samples assemble cleanly.
| Item | Known value | Design implication |
|---|---|---|
| Nominal side | 12.7 mm | This is the exact metric equivalent of 1/2 inch before tolerance and coating. |
| Typical Ni-Cu-Ni coating order of magnitude | about 12 micrometres in public retail guidance | On a 12.7 mm cube, coating thickness is a negligible fraction of the overall dimension, unlike on micro-magnets. Tolerance is driven more by machining variance. |
| Zinc coating order of magnitude | about 4 micrometres in public retail guidance | Zinc is usually chosen for cost and appearance trade-offs, not maximum corrosion protection. |
| Public evidence gap | no universal coating spec | There is no reliable public rule that one coating always survives handling. Require supplier salt-spray, adhesion, chip, and packaging evidence for the actual lot. |
Treat published coating thicknesses as screening numbers only. The RFQ should ask whether dimensions are measured before or after coating, and what inspection method catches edge chips on 12.7 mm cubes.
| Option | Best fit | Trade-off |
|---|---|---|
| 1/2 inch cube | Industrial holding, sensor arrays, fixtures, and heavy-duty latching | Excessive force for casual handling; high risk of pinching and shattering upon impact |
| 3 mm to 5 mm cube | Lower-force trials, sensor experiments, and tighter pockets | Much less pull and mass than a 1/2 inch cube; easier to lose during handling |
| Disc magnet | Axial pull on a flat surface with easier catalog comparison | Different mounting geometry and less useful when a cube edge indexes the part |
| Steel cup or carrier | Holding tasks where usable pull matters more than bare magnet size | Adds assembly cost, changes corrosion design, and needs testing |
| Method | It answers | It does not answer |
|---|---|---|
| Material data sheet | Grade range, density, Br, Hc, BHmax, temperature class | Finished pull through your air gap, coating defects, packaging loss, or consumer compliance |
| Gaussmeter surface check | A local field reading at a defined point and probe orientation | Pull force, flux index, or package-level shipping field unless the method is defined |
| Pull test fixture | Usable axial force for one target steel, gap, direction, and speed | Shear holding force, impact retention, corrosion life, or sensor switching distance |
| Flux index test | Consumer magnet safety threshold evidence when the product is in scope | Industrial RFQ performance or shipment classification |
| Package field screen | Whether the packed shipment meets a postal or air-carrier magnetic field threshold | Individual magnet grade or buyer assembly performance |
Miniature sensor trigger
Inputs: 1/2 inch cube, N52, fixed plastic pocket, room temperature
Result: Screen for field direction first; axial pull is less relevant than field at the sensor location.
Tiny display or model latch
Inputs: 12.7 mm cube against painted steel or another magnet
Result: Use gap condition in the tool and prototype the pocket because adhesive thickness can dominate performance.
Production coding magnet
Inputs: Thousands of magnets, polarity orientation required
Result: Specify packaging and pole marking process before price comparison, not after sample approval.
Consumer-accessible accessory
Inputs: Loose or detachable cube magnets
Result: Treat safety and retention as a blocker before sourcing; do not rely on magnet size alone.
Risk
Ambiguous alias on procurement documents
A buyer may intend 1/2 inch while a supplier sees an incomplete or malformed size.
Mitigation: Normalize to 0.5 in cube / 12.7 mm cube in drawings, RFQs, and sample approvals.
Risk
Overstating pull force
A 1/2 inch cube can show strong catalog pull on thick steel, but paint, tape, air gap, and thin steel can sharply reduce practical holding force.
Mitigation: Use the tool as a screen, then test on the real mating part with a defined safety factor.
Risk
Collision and shatter hazard
A 1/2 inch cube jumps toward magnetic objects with high acceleration. When two 1/2 inch NdFeB magnets collide, they often shatter and eject sharp fragments.
Mitigation: Require foam spacers or dedicated slots in shipping trays. Mandate safety glasses and non-magnetic assembly fixtures during production.
Risk
Consumer-accessible small magnet hazard
Loose or separable high-powered magnets can create ingestion and pinch hazards. For U.S. consumer products covered by 16 CFR Part 1262, a magnet that fits the small-parts cylinder and has flux index at or above 50 kG2 mm2 is a hazardous magnet.
Mitigation: Run product-safety review before consumer use; document small-parts fit, flux-index test method, product scope, retention method, and warning controls.
Risk
Temperature mismatch
Standard N-grade magnets may lose margin in hot enclosures or near motors.
Mitigation: Request high-coercivity grade review and hot-field or hot-pull testing for elevated temperatures.
Risk
Unscreened magnetic shipment
Bulk magnets in one package can create a field outside the parcel even when each cube looks compact.
Mitigation: Ask the supplier to confirm shielding, spacer layout, and package-level field screening before air shipment or postal routing.
K&J Magnetics B888-N52 1/2 inch cube data
Used as the public catalog pull-force calibration anchor for N52 thick-steel screening. Accessed July 27, 2026.
Review sourceArnold Magnetic Technologies N52 data sheet
Used for N52 material-property range and density screening. Accessed June 10, 2026.
Review sourceDura Magnetics N52 technical note
Used for grade-selection caveats around temperature, geometry, cost, and application constraints. Accessed June 10, 2026.
Review sourceMagnetic Materials Producers Association standards page
Used as a standards pointer for permanent magnet material-guideline framing. Accessed June 10, 2026.
Review sourceU.S. Consumer Product Safety Commission magnet resources
Used for the consumer-accessible small high-powered magnet safety boundary. Accessed June 10, 2026.
Review source16 CFR Part 1262 and CPSC business guidance
Used for the hazardous-magnet threshold, covered product scope, and industrial-use boundary. Accessed June 10, 2026.
Review sourceIEC 60404-5:2015
Used to separate material-property measurement from finished-assembly pull testing. Accessed June 10, 2026.
Review sourceFAA PackSafe - Magnets
Used for package-level aircraft-carriage magnetic field thresholds. The FAA page was last updated March 15, 2023 and was accessed June 10, 2026.
Review sourceDura Magnetics corrosion guidance and supermagnete coating FAQ
Used for coating/corrosion boundaries, ASTM B117 context, and public coating-thickness order-of-magnitude references. Accessed June 10, 2026.
Review sourceThis page treats the phrase as a 1/2 inch neodymium cube magnet, about 12.7 mm on each side. For procurement, write 1/2 inch cube or 12.7 mm cube instead of the bare search phrase.
Using 7.6 g/cm3 sintered NdFeB density, a 1/2 inch cube weighs about 15.56 g before coating and lot variation.
No. N52 has high room-temperature energy product, but a 1/2 inch cube can still be limited by air gap, steel thickness, heat, handling, or assembly geometry.
No. It is an RFQ screening estimate. Guaranteed pull force requires a defined target steel, gap, fixture, pull direction, speed, temperature, and sample plan.
Write 1/2 inch cube neodymium magnet or 12.7 mm cube, then add grade, tolerance, coating, magnetization axis, quantity, packaging, and validation tests.
They may need either visible pole marking or controlled tray orientation. For automated assembly, carrier layout and polarity inspection are often more reliable than relying on operators to read marks.
Ni-Cu-Ni is common for indoor use. Epoxy, zinc, or other coatings should be selected only after corrosion, adhesive, and handling requirements are known.
Avoid them when users can access loose magnets, when the application needs meaningful holding force through a gap, when heat is high, or when assembly cannot control polarity.
Yes, but price and lead time depend heavily on tolerance, coating, sorting, packaging, polarity control, inspection, and loss allowance.
A cube has equal sides and can index mechanically in a square pocket. A disc usually has a clearer axial direction and easier catalog pull comparisons.
Public data cannot certify a buyer-specific pull value, corrosion life, exact coating build, or lot-specific magnetic moment. Those require supplier data and sample testing.
No. Public information is not enough to clear a consumer product. For covered products under 16 CFR Part 1262, check whether the magnet fits the small-parts cylinder and whether flux index is below 50 kG2 mm2 using the required method.
No. Air routing depends on package-level magnetic field after shielding and packing. FAA PackSafe states that a package or magnet above 0.00525 gauss at 15 feet from any surface cannot fly, so bulk lots need package screening.
While coating thickness is small compared to a 12.7 mm side, a proper Ni-Cu-Ni or Zinc coating is essential to prevent corrosion. Public retail guidance lists Ni-Cu-Ni around 12 micrometres, but supplier-specific coating build and tolerance must be confirmed for the actual part.
For industrial RFQs, start with a drawing, material data sheet, and a pull or field fixture that matches the assembly. For consumer-accessible products, add flux-index and retention review before sourcing.
No. This route is focused on the 1 2 in cube neodymium magnets query. Use the broader /learn/neodymium-magnet-cube guide for general cube sizing, and use this page when the RFQ starts from the 1/2 inch alias.
Use the calculator output to start an RFQ only after normalizing the alias into drawing-grade dimensions. For the current alias, that means 1/2 inch cube or 12.7 mm cube, then grade, coating, tolerance, magnetization axis, packaging, and validation method.
Inquiry Email