Check whether this exact micro SmCo size is practical enough to quote, then review the geometry, evidence gaps, alternatives, and RFQ questions before contacting a supplier.
Published: 2026-06-17 · Last reviewed: 2026-06-17
Enter the drawing constraints and duty profile. The checker estimates micro-part volume, mass, manufacturability, thermal margin, evidence gaps, and the next RFQ action.
The first decision is not "is this magnet strong?" It is whether the exact 7 x 6 x 1 mm geometry is sufficiently defined for a comparable SmCo RFQ.
The exact size has only 42 mm3 of volume and about 0.35 g of SmCo mass at an 8.3 g/cm3 density estimate. The decision risk is tolerance, edge integrity, magnetization, and evidence, not catalog wording.
[P1][P2] Reviewed 2026-06-17
A 7 x 6 mm face gives 42 mm2 of pole area when magnetized through the 1 mm thickness. Magnetizing through 6 mm or 7 mm can be possible only after fixture and field review.
[P1] Reviewed 2026-06-17
Public SmCo references commonly frame SmCo around high-temperature stability and low reversible temperature drift. Pull force still cannot be inferred from the size alone because air gap and circuit geometry dominate.
[R1][R2][R3][R10] Reviewed 2026-06-17
Search sampling did not surface a stable, authoritative public benchmark for exact 7 x 6 x 1 mm SmCo price, MOQ, lead time, or universal stock status. Resolve those items by RFQ.
[U1] Reviewed 2026-06-17
Existing 34 grade pages cover grade characteristics and applications. This page answers whether this exact small geometry is practical enough to quote and what evidence belongs in the RFQ.
[P3] Reviewed 2026-06-17
USGS 2026 cobalt and rare-earth summaries point to 2025 import reliance and export-control issues that affect traceability and schedule risk. Consumer-facing magnet products also need a separate safety screen.
[R6][R7][R8] Reviewed 2026-06-17
These values are deterministic from the nominal dimensions except mass, which uses a practical 8.3 g/cm3 SmCo density estimate.
Nominal size
7 x 6 x 1
mm
A flat micro block or plate geometry; drawing direction and edge condition matter.
Nominal volume
42
mm3
Small enough that handling, grinding, and inspection setup can dominate unit economics.
Mass estimate
~349
mg
Calculated from 42 mm3 and 8.3 g/cm3 density; final mass depends on alloy and tolerance.
Pole face if 1 mm magnetized
42
mm2
A practical default for a flat part; not a pull-force number.
Thickness gate
1
mm
Thin sintered SmCo needs chip, chamfer, coating, and fixture review.
The page keeps public exact-size availability as unknown and adds standards boundaries, current supply-chain context, and small-magnet compliance screens so the RFQ decision is not based on size wording alone.
| Audited gap | Research finding | Page action | Sources |
|---|---|---|---|
| Material claims were source-backed but not standards-bounded. | ASTM A1102-19 covers sintered SmCo families and magnetic characterization, while IEC 60404-8-1:2023 covers minimum magnetic values and dimensional tolerances for permanent magnet materials. | Added a standards boundary section and tied grade requests to Br, Hcj, demagnetization curves, tolerance, and supplier revision date. | [R4][R9] |
| Supply risk was implied, not quantified with current public data. | USGS MCS 2026 estimates 2025 U.S. cobalt net import reliance at 79% and notes April 2025 China export controls on samarium-related rare-earth materials. | Added sourcing-risk rows and a procurement note that price, MOQ, and lead time remain quote-date evidence, not search-result facts. | [R6][R7][U1] |
| Small-magnet safety was absent for sample kits or consumer-adjacent use. | CPSC 16 CFR Part 1262 took effect on October 21, 2022; its related notice of requirements took effect on December 20, 2022. The rule uses a small-parts cylinder plus flux-index screen. | Added a compliance boundary and tool action so consumer, educational, jewelry, stress-relief, or demo-kit uses are not treated as ordinary industrial RFQs. | [R8] |
| Exact-size commercial evidence could be mistaken for a weak claim. | No authoritative exact 7 x 6 x 1 mm SmCo public benchmark for stock, MOQ, lead time, or price was found in this research pass. | Kept the conclusion as "待确认 / public evidence insufficient" and converted it into a supplier RFQ evidence requirement. | [U1] |
The tool is deterministic. It does not estimate pull force, supplier stock, or price because those require assembly-specific evidence.
| Step | Output | Evidence basis |
|---|---|---|
| 1. Freeze the exact drawing question | Confirm whether 7 x 6 x 1 mm is mandatory, negotiable, or only a search query. | [P1] |
| 2. Convert size to risk metrics | Calculate 42 mm3 volume, mass estimate, tolerance/thickness ratio, and magnetized area. | [P1][P2] |
| 3. Add duty context | Overlay continuous/peak temperature, reverse-field exposure, media, assembly method, and volume. | [R1][R2][R5] |
| 4. Request supplier proof | Ask for grade family, magnetic values, curves at duty temperature, edge plan, and inspection method. | [R3][R4][R9][P2] |
| 5. Compare alternatives only after constraints are visible | Check thicker SmCo, SmCo5, Sm2Co17, or high-temperature NdFeB against the same duty profile. | [P3] |
| 6. Screen supply and compliance before release | Separate industrial RFQ use from loose sample, consumer, education, or regulated procurement paths. | [R6][R7][R8] |
Standards improve quote comparability, but they do not replace a drawing review for a 1 mm-thick custom SmCo part. Use them to define properties and methods, then still validate geometry, temperature, and handling.
| Standard / context | Scope | Decision use | Limit | Source |
|---|---|---|---|---|
| ASTM A1102-19 | Sintered fully dense SmCo permanent magnets in SmCo 1:5 and SmCo 2:17 composition families. | Use as a boundary for grade family, Br/Hcj expectations, SI-unit values, and demagnetization-curve requests. | Does not prove this exact 7 x 6 x 1 mm part is stocked, manufacturable at a given tolerance, or approved at temperature. | [R4] |
| IEC 60404-8-1:2023 | Permanent magnet material specifications, including minimum magnetic-property values and dimensional tolerances. | Use when a quote needs standardized material property and tolerance language across suppliers. | The public page gives scope and publication metadata; detailed tables require the standard. | [R9] |
| MMPA 0100 / IEC 60404-5 context | Permanent magnet material classification and measurement context used by industry data sheets. | Use to ask how magnetic properties were measured and whether the magnet axis/cross-section assumptions fit the part. | Older or secondary copies should be verified against current controlled standards before contract use. | [R10] |
Each gate prevents a common failure mode: buying by size label, assuming grade equivalence, or discovering custom-part constraints after sample release.
| Gate | Pass signal | Fail signal | Buyer action | Source |
|---|---|---|---|---|
| Exact geometry | Drawing states 7.00 x 6.00 x 1.00 mm, tolerance, edge condition, and magnetization direction. | The RFQ only says "7mm x 6mm x 1mm samarium cobalt magnet" without tolerance or direction. | Send a drawing or at least a dimensioned sketch before comparing price. | [P1] |
| Material family | Supplier identifies SmCo5 or Sm2Co17 family, grade, value basis, and current datasheet. | Supplier only says samarium cobalt without grade family or magnetic values. | Ask for Br, Hcb, Hcj, BHmax, temperature coefficient, and maximum operating temperature. | [R1][R2][R4][R9] |
| Standards boundary | Quote states whether the material is evaluated to ASTM A1102-19, IEC 60404-8-1, MMPA guidance, or supplier-specific datasheet limits. | Supplier uses a grade name without a standard, measurement method, or demagnetization-curve basis. | Ask which standard, test method, SI/cgs units, and revision date apply to the magnetic values. | [R4][R9][R10] |
| Temperature proof | Supplier provides curves or irreversible-loss evidence at the intended duty temperature. | The quote assumes a blanket 250 C or 300 C SmCo rating without geometry or load-line context. | State continuous temperature, peak dwell, cycle count, and reverse-field exposure. | [R1][R2][R5] |
| Manufacturing control | Grinding route, edge quality, coating/media exposure, and inspection sample plan are defined. | The small 1 mm section is quoted without chip, burr, or handling-risk language. | Require edge/chamfer expectation and packaging method before sample release. | [P2] |
| Commercial evidence | Quote separates sample cost, fixture/tooling cost, MOQ, quantity breaks, and repeat lead time. | Buyer assumes a public commodity price or lead time exists for the exact size. | Use RFQ data dated to supplier, quantity, destination, documentation, and coating need. | [U1] |
| Supply and compliance context | RFQ states origin/traceability needs and flags whether the magnet is for an industrial assembly or a consumer-facing product. | Quote ignores 2025 supply-control context or treats a loose small magnet sample as ordinary merchandise. | Add origin, export-control, and CPSC/consumer-product screening language when the use case requires it. | [R6][R7][R8] |
These data points do not prove availability for the exact size. They explain why quote validity, origin, export-control review, and traceability should be asked early when the application is regulated or repeat-production sensitive.
Current data: USGS MCS 2026 estimates 2025 U.S. cobalt net import reliance at 79%, with imports for consumption at 14,000 metric tons cobalt content.
Buyer meaning: Do not treat a tiny magnet as immune to origin, quote validity, or strategic material questions.
Action: Ask for origin, quote validity date, alternate grade options, and whether cobalt documentation is required for the program.
[R6]
Current data: USGS MCS 2026 reports April 2025 China export controls covering alloys, compounds, metals, and oxides of samarium and several other rare earths.
Buyer meaning: Availability and lead time can change even when the geometry is simple.
Action: Ask whether the supplier has controlled-material screening, alternative routing, or buffer-stock assumptions for repeat orders.
[R7]
Current data: USGS rare-earths summary lists FY 2025 potential U.S. stockpile acquisition of 60 tons of samarium-cobalt alloy.
Buyer meaning: SmCo alloy can be treated as a strategic material context, not only a small component purchase.
Action: Add traceability and procurement clause screening early for aerospace, defense, or audit-heavy programs.
[R7]
Current data: No authoritative public benchmark was found for this exact 7 x 6 x 1 mm SmCo price, MOQ, lead time, or stocked status.
Buyer meaning: Public search results are insufficient for procurement approval.
Action: Mark as 待确认 and resolve by supplier RFQ with drawing, quantity, destination, documentation, and test requirements.
[U1]
The same 7 x 6 x 1 mm size can be sensible, marginal, or over-specified depending on heat, reverse field, package height, and cost pressure.
Signal: Small sensor, encoder, latch, or hot compact assembly where stable output and temperature resistance matter.
Reason: SmCo can justify the premium when the package is tight and heat/corrosion/drift risks are real.
Action: Run the tool, attach drawing, and request curves plus inspection gates.
Signal: Moderate temperature, unknown reverse field, or tolerance tighter than the supplier usually supports.
Reason: The size may still work, but manufacturing and magnetic proof must be resolved before quote acceptance.
Action: Ask whether thickness, tolerance, chamfer, or magnetization direction can be adjusted.
Signal: Low-temperature simple holding task, large air gap uncertainty, or cost-first consumer-grade purchase.
Reason: A cheaper NdFeB or ferrite path may be more practical if heat and stability do not justify SmCo.
Action: Compare alternatives before committing to a custom micro SmCo RFQ.
Signal: A requested pull force is stated without air gap, yoke, target material, coating, or magnetization curve.
Reason: Size alone does not determine pull force or final field performance.
Action: Request magnetic circuit assumptions or prototype testing instead of a single catalog number.
Signal: The magnet will be sold loose, shipped in a sample/demo kit, used in education, jewelry, stress relief, entertainment, or another consumer-adjacent product.
Reason: A 7 x 6 x 1 mm rare-earth magnet is small enough that consumer magnet safety rules may become relevant outside a controlled industrial assembly.
Action: Screen against applicable CPSC, toy, packaging, warning, and third-party testing requirements before shipment.
Compare options by the same dimensions and duty profile. Do not compare SmCo and NdFeB by room-temperature force alone.
| Option | Best use | Proof needed | Tradeoff |
|---|---|---|---|
| 7 x 6 x 1 mm SmCo, through-thickness | Compact hot or stable-field assemblies where a flat micro block is intentional. | Drawing, magnetization direction, grade table, curves at temperature, tolerance and edge plan. | Strong thermal/stability logic; small-part machining and sample cost can dominate. |
| Slightly thicker SmCo variant | Assemblies that can accept 1.2-2.0 mm thickness for better handling and margin. | Revised envelope, field model, adhesive/retention review, and sample comparison. | Often improves manufacturability but changes field, fit, and package height. |
| SmCo5 family | Moderate high-temperature and corrosion-resistant applications where maximum energy product is not the bottleneck. | Family confirmation, circuit model, operating temperature, and coating/media review. | May simplify some applications but gives lower energy density than high-energy Sm2Co17 paths. |
| Sm2Co17 family | Higher-temperature or higher-performance programs where extra thermal headroom is needed. | Hcj margin, demagnetization curves, temperature coefficient, and irreversible-loss evidence. | More capable for severe duty but can increase cost and sourcing complexity. |
| High-temperature NdFeB | Lower to moderate temperature applications where stronger room-temperature field and cost dominate. | Temperature derating, corrosion/coating plan, irreversible-loss check, and heavy-rare-earth review. | Can reduce cost but may fail heat, corrosion, or stability requirements that drove SmCo search. |
| Loose magnet sample or kit | Engineering evaluation inside controlled industrial procurement only. | End-use classification, warnings, packaging, lab/testing path, and whether CPSC magnet rules are in scope. | A technically correct micro magnet can become a compliance problem if packaged or marketed for consumer use. |
The main risks are not theoretical: they show up as sample fallout, non-comparable quotes, and late qualification delays.
Trigger: 1 mm thickness, sharp corners, press-fit handling, or aggressive grinding.
Impact: Sample fallout, edge cracks, field variation, or assembly scrap before production approval.
Mitigation: Define chamfer/edge condition, handling packaging, incoming inspection, and fixture pressure.
Trigger: The drawing omits whether the part is magnetized through 1 mm, 6 mm, or 7 mm.
Impact: Correct material can deliver the wrong field direction in the final assembly.
Mitigation: Mark magnetization direction on the drawing and request supplier field-orientation confirmation.
Trigger: A public SmCo temperature number is used as blanket approval for a small custom geometry.
Impact: Irreversible loss or field drift appears after sample or thermal-cycle testing.
Mitigation: Separate continuous temperature, peak dwell, cycle count, reverse field, and curve evidence.
Trigger: Buyer asks for holding force from dimensions without air gap, yoke, or target material.
Impact: The wrong material is selected because the magnetic circuit was never defined.
Mitigation: Model or test the actual magnetic circuit; do not use size alone as force evidence.
Trigger: Exact-size search is treated as a stocked commodity without quote-date evidence.
Impact: MOQ, tooling, inspection burden, or lead time breaks the project schedule.
Mitigation: Quote sample and production paths separately, including fixture, magnetizing, inspection, and quantity breaks.
Trigger: Origin, lot records, standards, or contract clauses are checked after samples are approved.
Impact: A technically acceptable magnet may still fail regulated procurement acceptance.
Mitigation: Add traceability and standards language to the first RFQ when aerospace, defense, or audit requirements apply.
Trigger: Buyer treats small size as easy availability and ignores samarium/cobalt origin, export controls, or quote-date validity.
Impact: A sample can pass technically while production timing, export documentation, or material substitution blocks scale-up.
Mitigation: Ask for origin, export-control screening, quote validity, alternate grade path, and lot traceability during the first RFQ.
Trigger: The small loose magnet is repackaged as a sample, demo, education, jewelry, stress-relief, or hobby product.
Impact: The project may need CPSC, toy, labeling, packaging, or third-party testing review instead of a normal industrial purchase.
Mitigation: Classify end use early and avoid shipping loose high-powered magnets into consumer-facing channels without compliance review.
Assumptions: 7 x 6 x 1 mm flat block, through-thickness magnetization, 120 C continuous, low reverse field, 10,000 pcs/year.
Process: Use the checker baseline, then ask for SmCo grade values and field direction confirmation.
Outcome: Likely RFQ-ready if tolerance and edge quality are realistic; pull force remains circuit-specific.
Assumptions: 220 C continuous, 280 C peak, reverse-field exposure around 7 kOe, tight package height.
Process: Run the hot-zone profile and request curves at temperature plus irreversible-loss evidence.
Outcome: Conditional candidate; Sm2Co17 may be justified only if curve evidence supports the load line.
Assumptions: 1 mm thickness, +/-0.03 mm tolerance, cleaning fluid exposure, manual placement.
Process: Treat edge/chip and media exposure as gates before approving samples.
Outcome: Supplier DFM review should precede quote acceptance; chamfer or coating may change the RFQ.
Assumptions: Room-temperature duty, no special stability need, cost-sensitive sourcing.
Process: Compare NdFeB and ferrite paths before custom SmCo quoting.
Outcome: SmCo is likely over-selected unless corrosion, audit, or temperature constraints are hidden.
Assumptions: Small loose rare-earth magnets sent to multiple reviewers, no final industrial enclosure, unclear recipient handling.
Process: Treat the use as a compliance and packaging screen before treating it as a routine RFQ shipment.
Outcome: 待确认 until end use is classified; consumer-facing or education-adjacent distribution needs a separate safety review.
Attach the tool output and these fields so suppliers quote the same part instead of different interpretations of the keyword.
RFQ input 1
Drawing with 7.00 x 6.00 x 1.00 mm, tolerance, chamfer or edge condition, and magnetization direction.
RFQ input 2
Operating temperature, peak dwell, reverse-field exposure, coating or media exposure, and assembly method.
RFQ input 3
Target SmCo family if known, minimum magnetic values, quantity breaks, sample need, destination, and documentation level.
Inquiry Email
Public sources support material and standards context. Exact-size price, MOQ, lead time, stock status, and pull force remain supplier- and assembly-specific.
| ID | Source | Date | Coverage | Limit |
|---|---|---|---|---|
| R1 | Arnold Magnetic Technologies SmCo design guidance | Accessed 2026-06-17 | General SmCo positioning for high-temperature and corrosion-resistant magnet applications, plus the need to account for magnetic circuit design. | Supplier source; use for material-positioning context only |
| R2 | Electron Energy Corporation SmCo sell sheet | Accessed 2026-06-17 | Public SmCo grade-family data and temperature screens used to frame why supplier revision and grade family should be requested. | Supplier source; confirm current revision during RFQ |
| R3 | Electron Energy Corporation 34 Grade SmCo sell sheet | Accessed 2026-06-17 | Example high-energy Sm2Co17 public value set and demagnetization-curve expectations; useful for evidence language, not exact-size stock proof. | Supplier source; grade example only |
| R4 | ASTM A1102-19 public standard summary | Accessed 2026-06-17 | Sintered SmCo family scope, approximate public Br/Hcj ranges, SI-unit basis, and reference to demagnetization-curve characterization through ASTM A977/A977M. | Standards source; full standard may require purchase |
| R5 | Electron Energy Corporation technical brief: Advancements in SmCo Magnetic Properties | Accessed 2026-06-17 | Technical context for high-temperature SmCo property changes and why hot-service claims need curves rather than size-only assumptions. | Supplier technical source; screening context only |
| U1 | Public exact-size evidence gap | Reviewed 2026-06-17 | Search sampling did not find a reliable authoritative benchmark for exact 7 x 6 x 1 mm SmCo stock status, MOQ, price, or lead time. | Known unknown; resolve by supplier RFQ |
| R6 | USGS Mineral Commodity Summaries 2026: Cobalt | Published February 2026; accessed 2026-06-17 | 2025 cobalt import reliance, imports, consumption, price context, DRC export quota context, and U.S. stockpile solicitation signal. | Government commodity summary; use for supply-risk context, not exact magnet pricing |
| R7 | USGS Mineral Commodity Summaries 2026: Rare Earths | Published February 2026; accessed 2026-06-17 | 2025 rare-earth export-control context including samarium materials and FY 2025 potential stockpile acquisition of SmCo alloy. | Government commodity summary; use for material availability and traceability context |
| R8 | CPSC Safety Standard for Magnets, 16 CFR Part 1262 | Final rule published 2022-09-21; rule effective 2022-10-21; notice of requirements effective 2022-12-20; reviewed 2026-06-17 | Consumer magnet safety screen for subject magnet products, including small-parts-cylinder and flux-index concepts. | Regulatory source; page does not provide legal advice and industrial assemblies may be outside scope |
| R9 | IEC 60404-8-1:2023 public catalog page | Published 2023-09-20; accessed 2026-06-17 | Permanent magnet material specifications, minimum principal magnetic properties, dimensional tolerances, density information scope, and stability date. | Standards catalog source; detailed tables require the standard |
| R10 | MMPA 0100 permanent magnet material specification copy | Accessed 2026-06-17 | Industry context for permanent magnet material property measurement and classification, including IEC 60404-5 measurement references. | Secondary public copy; verify against controlled current documents for contract use |
| P1 | SmCoSupply size-analysis method | Reviewed 2026-06-17 | Geometric calculations for 7 x 6 x 1 mm, including volume, pole-face area, aspect ratio, and tolerance/thickness screening. | Deterministic calculation from user-entered dimensions |
| P2 | SmCoSupply machining and RFQ practice | Reviewed 2026-06-17 | Thin SmCo handling, edge, coating, inspection, sample, and packaging gates for small custom parts. | Practice-based guidance; confirm against final drawing |
| P3 | SmCoSupply anti-duplication review | Reviewed 2026-06-17 | This page differs from 34 grade pages by focusing on exact-size RFQ feasibility and small-geometry sourcing controls. | Internal information-architecture decision |
Use this when the supplier quote includes a 34 grade or Sm2Co17 property claim.
Understand BHmax, Br, Hcj, temperature coefficient, and grade-equivalence limits.
Review the high-temperature SmCo family most likely to be considered for severe duty.
Review custom flat, disc, and block geometry supply capability for OEM drawings.
Use this path when 1 mm thickness, tolerance, edge condition, or assembly handling is the main risk.
Turn sample approval into inspection, thermal, and reliability gates before production release.
Share the tool output with drawing, duty profile, and quantity for engineering review.
