Alias coverage
1 inch cube
This canonical page maps the ambiguous search phrase 1 2 inch cube neodymium magnets to a 1 inch cube, about 25.4 mm per side. Confirm the actual size from a drawing before ordering.
Hybrid Tool + Report
1 inch cube neodymium magnet calculator
Start with the cube quick check, then use the report layer to decide whether a 1 inch neodymium magnet cube is practical for pull, field, coating, safety, and production handling.
The alias phrase 1 2 inch cube neodymium magnets is normalized here as a 1 inch cube, about 25.4 mm per side, so the tool, RFQ wording, and evidence use the same size.
Published September 26, 2026 · Reviewed October 6, 2026
Page default
1 in
Metric side
25.4 mm
Best next step
Sample test
Cube Magnet Quick Check
Size, mass, pull screening, and RFQ readiness
Defaults are set to 1 inch cube neodymium, normalized from the searched phrase 1 2 inch cube neodymium magnets.
This explicitly answers the 1 2 inch cube neodymium magnets query as a 1 inch cube, about 25.4 mm per side.
Estimated axial pull
420.80 N
94.60 lbf on clean thick steel
Single cube weight
124.5417 g
Batch weight
124,541.7 g
Volume
16.38706 cm3
Illustrative shear friction (μ=0.18)
75.74 N
Screened surface field
6,451 G
Grade model
N52
Assumption: sintered NdFeB density 7.6 g/cm3, cubic geometry, single-axis magnetization, flat axial contact, no safety factor, and an illustrative friction coefficient μ=0.18 for the shear estimate. It is not a rated working load. Pull model is anchored to K&J Magnetics BX0X0X0-N52 1 inch cube Case 1 pull data and scaled by face area for screening. Final force depends on target steel thickness, air gap, coating, temperature, shear direction, and test fixture.
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.
Page default
1 in
Metric side
25.4 mm
Best next step
Sample test
Default mass
124.5 g
Using 7.6 g/cm3 sintered NdFeB density, a 1 inch cube weighs about 124.5 g before coating and inspection variance.
Typical Pull Force (N52)
≈ 95 lbs (43 kg)
Against a thick flat steel plate, a 1 inch N52 cube generates roughly 95 lbs of pull force. Air gaps or thin steel will reduce this drastically.
Handling risk
Severe pinch & collision
With high mass (124.5 g) and about 95 lbs catalog pull force, these cubes can collide hard and chip or shatter, sending dangerous fragments.
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.
Core decision summary
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 inch cube neodymium magnets query is covered here using a clear 1 inch assumption; the phrase itself does not define an orderable size. If your drawing specifies 1/2 inch, use the 1/2 inch cube guide instead. This hybrid page keeps the size, grade, coating, and validation decisions together.
The fast answer is that a 1 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.
- Good fit: miniature sensors, coding magnets, model fixtures, and square pockets.
- Poor fit: hot assemblies, high shear, large air gaps, loose consumer magnets, or manual handling without trays.
- Required next step: validate polarity, pull or field, coating, and packaging with real samples.
- Evidence status: public data supports material and mass screening; final force remains buyer-specific.
Tool-to-report flow
Methodology and data sources
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) | ≈ 94.6 lbs on thick steel | K&J Magnetics BX0X0X0-N52 (1" cube) pull force data (Case 1), checked October 6, 2026. |
| Catalog surface field (N52) | 6,451 G for the 1 inch cube reference product | K&J Magnetics BX0X0X0-N52 product specification; surface field is a catalog reading, not a buyer-specific assembly measurement. |
| Consumer magnet threshold | For covered subject magnet products, a magnet fitting entirely in the small-parts cylinder must test below 50 kG²·mm² | 16 CFR Part 1262 defines product scope and requires the prescribed flux-index test; this page does not calculate or certify compliance. |
| Canonical size normalization | 1 in = 25.4 mm; the search phrase itself is not a dimension | Exact inch-to-mm conversion. The canonical page uses 1 inch as its stated assumption for the ambiguous search phrase. |
| 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, checked October 6, 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. |
Related RFQ guides
Use these internal references when the 1 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 inch cube neodymium magnet or 25.4 mm cube on drawings, RFQs, and sample approvals.
Send drawing details1/16 inch cube neodymium magnet guideCompare the micro-cube handling, tolerance, and packaging guidance when your drawing specifies 1/16 inch.N52 magnet grade guideCheck the grade-strength, heat, and validation limits before defaulting every 1 inch cube to N52.N42 magnet specificationsCompare a lower-grade option when force margin, cost, or operating temperature changes the decision.N52 disc magnet calculatorCompare round axial-pull behavior before changing a square pocket into a disc magnet assembly.Neodymium rare earth disc magnets guideUse this when the 1 2 in cube query is actually the round 1 2 in neodymium rare-earth magnet discs requirement.Block and bar magnet RFQ categoryRoute square and rectangular NdFeB requirements into product sourcing once dimensions are fixed.
Cube size reality check
The 1 inch page assumption describes a substantial magnet: a cube with roughly 16,387 mm³ volume and about 124.5 g mass. A thousand pieces weigh about 124.5 kg (274 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.
Best-fit and poor-fit users
Use it when
- Square pocket orientation matters.
- The target is a sensor or coding field.
- The assembly can retain the cube mechanically.
- Samples can be tested before bulk order.
Avoid it when
- Loose magnets are consumer accessible.
- High holding force is needed through a gap.
- Heat or impact is uncontrolled.
- Assembly cannot control polarity.
Decision boundaries
Specification checklist
| RFQ field | Recommended wording | Why it matters |
|---|---|---|
| Size wording | Write 1 inch cube or 25.4 mm cube; avoid bare 1 2 inch 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 25.4 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. |
Compliance, shipping, and test boundaries
A 1 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. |
Tolerance and coating on 1 inch cubes
At this scale, the nominal side length dominates. Unlike micro-magnets, coating build is a negligible fraction of a 25.4 mm side. However, machining variance, burr control, and adhesive pocket clearance still decide whether samples assemble cleanly.
| Item | Known value | Design implication |
|---|---|---|
| Nominal side | 25.4 mm | This is the exact metric equivalent of 1 inch before tolerance and coating. |
| Typical Ni-Cu-Ni coating order of magnitude | about 12 micrometres in public retail guidance | On a 25.4 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. |
Coating build on a 25.4 mm cube
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 25.4 mm cubes.
Alternatives and trade-offs
| Option | Best fit | Trade-off |
|---|---|---|
| 1 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 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 |
What each validation method can and cannot prove
| 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 |
Scenario examples
Miniature sensor trigger
Inputs: 1 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: 25.4 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 controls
Risk
Ambiguous alias on procurement documents
The phrase 1 2 inch does not define a manufacturable size and could be read as 1/2 inch or as separate dimensions.
Mitigation: Confirm the drawing first. If 1 inch is intended, write 1 in cube / 25.4 mm cube in drawings, RFQs, and sample approvals.
Risk
Overstating pull force
A 1 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 inch cube jumps toward magnetic objects with high acceleration. NdFeB magnets can chip or shatter when they collide, ejecting 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.
Source notes and uncertainty
K&J Magnetics BX0X0X0-N52 1 inch cube data
Used as the public catalog pull-force and surface-field calibration anchor for N52 thick-steel screening. Checked October 6, 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. Checked October 6, 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 sourcePublic evidence is enough for conversion, mass, and grade-screening context. It is not enough to certify pull force, corrosion life, or consumer compliance for a buyer-specific product. Treat those items as sample-test and supplier-document requirements.
FAQ
Does the search "1 2 inch cube neodymium magnets" mean a 1/2 inch or 1 inch cube?
The phrase is ambiguous and is not a usable drawing dimension. This canonical page uses a 1 inch (25.4 mm) cube as its assumption. If your requirement is 1/2 inch (12.7 mm), confirm that on the drawing and use the dedicated 1/2 inch cube guide.
How much does a 1 inch neodymium cube weigh?
Using 7.6 g/cm3 sintered NdFeB density, a 1 inch cube weighs about 124.5 g before coating and lot variation.
Is N52 always the best grade for a 1 inch cube?
No. N52 has high room-temperature energy product, but a 1 inch cube can still be limited by air gap, steel thickness, heat, handling, or assembly geometry.
Can the calculator output be used as guaranteed pull force?
No. It is an RFQ screening estimate. Guaranteed pull force requires a defined target steel, gap, fixture, pull direction, speed, temperature, and sample plan.
What should I put on the RFQ instead of 1 2 inch cube neodymium magnets?
After confirming the drawing, write 1 inch cube neodymium magnet or 25.4 mm cube if that is the intended size, then add grade, tolerance, coating, magnetization axis, quantity, packaging, and validation tests.
Do 1 inch cube magnets need pole marking?
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.
Which coating is typical?
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.
When should I avoid 1 inch cube magnets?
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.
Can I order 1 inch cube magnets in bulk?
Yes, but price and lead time depend heavily on tolerance, coating, sorting, packaging, polarity control, inspection, and loss allowance.
How is a cube magnet different from a disc magnet?
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.
What data is still unknown after public research?
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.
Does a 1 inch cube automatically pass U.S. consumer magnet rules?
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.
Does the calculator tell me whether the shipment can fly?
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.
Why does coating matter so much on a 25.4 mm cube?
While coating thickness is small compared to a 25.4 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.
Which validation method should I ask for first?
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.
Which other cube size guides should I compare?
Use /learn/neodymium-magnet-cube for the 1/16 inch micro-cube scenario and /learn/1-2-in-cube-neodymium-magnets for a confirmed 1/2 inch (12.7 mm) cube. This page covers the ambiguous 1 2 inch cube neodymium magnets query using a stated 1 inch (25.4 mm) assumption.
Next action path
Use the calculator output to start an RFQ only after normalizing the alias into drawing-grade dimensions. For the current alias, that means 1 inch cube or 25.4 mm cube, then grade, coating, tolerance, magnetization axis, packaging, and validation method.
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