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Diametric magnet selector

1 in x 1 in Diametrically Magnetized Cylinder Selector

Run the selector first for a 1 in x 1 in diametrically magnetized cylinder, requested N52, 1/8, and 1/16 sensor checks.

Check whether a 1 in x 1 in diametrically magnetized cylinder, including a requested N52 version, a 1/8" dia 1/8" thick, or a 1/16" diametric neodymium magnet, is plausible for a Hall, reed, angle, or magnetometer layout before you freeze the drawing.

Start with the toolSend RFQ contextReview evidence

Evidence boundary: public 1 x 1 diametric examples checked for this page are N42, while the N52 1 x 1 reference is axial. Use the preset below as a conservative RFQ and handling-risk screen, then require measured lot data.

Quick sizing tool

Check a diametric magnet against a sensor gap

The default presets cover standard alias query sizes: a 1 in x 1 in diametrically magnetized cylinder requested as N52, a 1/16 x 1/32 in micro magnet, and a 1/8 x 1/8 in diametric magnet. Change the dimensions, gap, grade, and sensor family to get a deterministic first-pass result.

Decimal or fraction input accepted; 0.0625 in equals 1/16 in.

Decimal or fraction input accepted; 0.03125 in equals 1/32 in.

Include housing, adhesive, and sensor package stand-off. Large 1 in N52 checks may need a 15 mm or larger screening gap.

Result

Prototype before committing

Estimated field

6.5 mT

The estimate is near the target range; tolerances and mounting stack-up can flip the result. The mT target is a screening baseline for this page, not a universal sensor specification. Confirm the selected sensor threshold, polarity, and temperature drift before committing. Micro/small-cylinder mode ranks early geometry choices; replace it with gaussmeter or sensor fixture data before release.

Metric size

1.59 mm x 0.79 mm

Sensor target

6.0 mT screening baseline

A 1/16 x 1/32 diametric magnet is a micro magnet. It can be useful for compact Hall switching, but the mounting gap and polarity orientation usually matter more than grade alone.

Next step

Prototype on/off detection, index pulses, door or cover state; Check the exact BOP/BRP thresholds and sampling rate in the chosen datasheet.

Sizing conversion options

1", 1/8", 1/16"

Covers the 1 in x 1 in diametrically magnetized cylinder N52 request, 1/8 dia 1/8 thick (3.18x3.18mm), and 1/16 (1.59x0.79mm) micro sizes.

Tool output

mT estimate

Use the result as a screening value, then validate with the actual sensor threshold.

Field orientation

Side-to-side

Diametric polarity is useful when the sensor reads from the curved side or a rotating target.

Report summary

Core conclusions for sourcing and prototyping

The tool answers immediate sizing intent; the report below explains the assumptions, limits, and RFQ evidence needed to make the result trustworthy. Updated July 20, 2026.

N42/N52

published evidence split

1" x 1" requests are large-magnet risk screens

A requested 1 in by 1 inch N52 cylinder diametrically magnetized should be screened as a high-force, saturation-risk case. Public 1 x 1 diametric catalog examples in the evidence set are N42, while the N52 1 x 1 reference is axial; both point to severe handling and Hall saturation risk, but neither certifies an N52 diametric field map.

90 deg

field axis shift vs axial magnet

Diametric means side-to-side polarity

The north and south poles sit across the curved diameter, so the usable field changes as the cylinder rotates, creating a clean sinusoidal Bx/By vector pair.

1", 1/8", 1/16"

key design sizes covered

1" N52, 1/8" & 1/16" are key alias sizes

The requested 1 in by 1 inch N52 cylinder diametrically magnetized alias asks for a large-magnet risk screen, while a 1/8" dia 1/8" thick diametric neodymium magnet and the 1/16" size serve compact sensor selection. All three belong on this canonical check page.

<2 mm

practical prototype gap target

Gap dominates small magnet performance

For sub-2 mm magnets, adhesive layers (0.05-0.15 mm), package stand-off, and housing thickness consume the field margin. In this page model, a 0.5 mm gap change can drop the estimated field by over 50%.

On-Axis

mandatory alignment for 3D Hall

Absolute angle tracking requires on-axis alignment

To calculate angle using arctangent (atan2), a 3D Hall sensor must read balanced sine and cosine waves. Diametric cylinders mounted on the rotating shaft axis provide this ideal field.

Pending

public field-at-gap data

Published catalogs do not prove final micro-gap field

Public data verifies unit conversion (1 in = 25.4 mm) and orientation, but exact mT at a 1/8" x 1/8" (e.g. K&J D22-DIA) or 1/16" x 1/32" assembly gap remains pending confirmation until measured in the final fixture.

Methodology and assumptions

1Size Selection2Air Gap Analysis3Sensor Matching4Fixture Test5RFQ Specification

How the checker works

The checker converts inch dimensions to millimeters, applies a grade multiplier, penalizes very small magnet volume, estimates open-air field decay with gap, and compares the result with a sensor-family target. Micro magnets use a compact-cylinder screening model; the 1 in x 1 in N52 preset uses a separate large-cylinder saturation risk screen.

Where it should stop

The result should not be used as a certified field value. Steel brackets, adjacent magnets, package stand-off, temperature, and magnetizer variation can shift final readings, so prototype measurement remains required.

Screening estimate

Air gap decay estimate for 1/8" and 1/16" diametric magnets

Smaller magnet diameters, such as a 1/8 dia 1/8 thick or 1/16 diametric neodymium magnet, result in an accelerated dipole drop-off. The values below are model estimates for N52, not supplier-certified measurements.

Air Gap (mm)D101 (1/16" x 1/32" Thk)D11 (1/16" x 1/16" Thk)D12 (1/8" x 1/8" Thk)Sensing Notes
0.5 mm160 mT280 mT460 mTVery high field strength; risk of sensor saturation on linear models.
1.0 mm (Preset)25 mT42 mT65 mTOptimal air gap for micro sensors; robust signal margin.
1.5 mm5.2 mT9.8 mT16.5 mTDigital switches can trigger; Linear sensors struggle with resolution.
2.0 mm1.2 mT2.6 mT4.8 mTUndersized for reed switches; requires high-sensitivity Hall sensors.
2.5 mm0.4 mT0.9 mT1.8 mTApproaching sensor noise floor; only magnetometer can resolve.
3.0 mm<0.2 mT0.3 mT0.7 mTFailed state for micro sizes. High risk of mechanical vibration fault.
100 mT50 mT20 mT5 mT0 mT0.5mm1.0mm1.5mm2.0mm3.0mmD12-DIA (1/8" thick)D11-DIA (1/16" thick)D101-DIA (1/32" thick)Field Decay vs. Air Gap (N52 Diametric)

Decision boundary: use this table to rank candidate sizes and gaps. Do not use it as a drawing acceptance value; final mT must be measured with the chosen sensor, housing, adhesive stack, magnet coating, and production lot.

Mechanical tolerance design

Concentricity and radial offset alignment impact

For rotational encoder systems, radial misalignment distorts the sine/cosine flux vectors, causing significant angular calculation errors.

Radial OffsetAngle ErrorField LossSystem Consequence
0.1 mm0.2° to 0.4°<2%Negligible impact. Well within 3D Hall (e.g. TMAG5170) calibration capability.
0.2 mm0.8° to 1.5°5% to 8%Arctangent (By/Bx) amplitude skew. Measurable accuracy degradation; requires look-up table correction.
0.3 mm2.0° to 3.5°12% to 18%High angle error. Saturation or noise floor problems at phase transitions during rotation.
0.5 mm5.0° to 9.0°25% to 40%Critical assembly failure. Differential readings fail; signal distorted beyond simple linear correction.
ICIdeal: 0mm OffsetICOffsetMisaligned (Distorted Field)Radial Alignment Error and Flux Line Distortion

The offset values are planning estimates for compact end-of-shaft angle layouts. Treat them as a tolerance budget starting point and replace them with calibration data from the actual 3D Hall or angle sensor.

Environmental survivability

Thermal degradation limits and grade substitution

NdFeB magnets exhibit negative temperature coefficients. Standard grades demagnetize permanently at 80°C; high-temp variants are required for industrial environments. Confirm the exact operating temperature rating against the supplier's grade datasheet.

Magnet GradeMax Temp LimitCurie PointTemp Coef (Br)Stability Behavior
N52 (Standard NdFeB)80°C (176°F)310°CBr: -0.12%/°C, Hcj: -0.75%/°CReversible Br loss up to 80°C. Exceeding it causes permanent demagnetization; Hcj drops fast rendering it susceptible to external field knocks.
N42H (High Temp NdFeB)120°C (248°F)340°CBr: -0.11%/°C, Hcj: -0.58%/°CStandard choice for brushless motor rotary sensors. Higher intrinsic coercivity (Hcj >= 1353 kA/m) protects against thermal knockdown.
N38SH (Super High Temp)150°C (302°F)350°CBr: -0.10%/°C, Hcj: -0.52%/°CBest choice for automotive under-hood sensors and heavy machinery with stable loops up to 150°C (Hcj >= 1592 kA/m).
N35UH (Ultra High Temp)180°C (356°F)350°CBr: -0.09%/°C, Hcj: -0.49%/°CSourced for aerospace actuators and downhole tools. Retains coercivity (Hcj >= 1990 kA/m) against external reverse demagnetizing fields.
SmCo 26 (Samarium Cobalt)300°C (572°F)750°CBr: -0.035%/°C, Hcj: -0.20%/°CExceptional thermal stability (3-4x more stable than N52). Lower initial field (Br ~ 1.05 T) but vastly outperforms NdFeB above 150°C.
80°CN52120°CN42H150°CN38SH180°CN35UH300°CSmCo 26Grade vs. Max Operating Temperature limit before demagnetization

Temperature classes differ by supplier and magnet geometry. The table is suitable for RFQ scoping, but production release still needs supplier grade data, coating compatibility, and a hot/cold sensor-output test.

Geometric design principles

Optimal sensor placements for diametric magnets

Depending on the application, choose the sensor orientation (axial face vs. side-shaft) to match the sinusoidal change in magnetic vectors.

SNIC1. End-of-Shaft (Rotary)IC2. Side-Read / CoplanarIC3. Linear Proximity (Slide-by)
N52 diametric magnet cylinder batch for micro sensor validation

Product reference

Use real diametric samples before trusting a calculated gap

The selector is a screening tool. For a requested 1 in by 1 inch N52 cylinder diametrically magnetized, a 1/8 dia 1/8 thick diametric neodymium magnet, or any compact 1/16 x 1/32 in sensor target, final approval still depends on the actual magnet lot, sensor threshold, housing wall, adhesive thickness, nearby steel, and temperature profile.

Alias size decision check

What the 1 in N52, 1/8 dia 1/8 thick, and 1/16 diametric magnet aliases prove and do not prove

The exact conversion is fixed; the magnetic field at the sensor is not. Treat this size as a prototype starting point unless a supplier provides fixture-specific measured data.

Decision questionEvidence-based answerAction
What does the requested 1 in by 1 inch N52 cylinder diametrically magnet alias need?It needs a large-magnet saturation and handling-risk decision, not another thin product page. Public evidence supports the 1 x 1 diametric geometry through N42 examples and comparable 1 x 1 N52 strength through an axial catalog item, so the N52 preset is a risk screen rather than proof of a stocked N52 diametric line.Run the large-N52 preset, require supplier confirmation of N52 diametric magnetization, protect the assembly from pinch hazards, and measure Bx/By across tolerance before RFQ release.
Are the 1/8" x 1/8" and 1/16" x 1/32" sizes credible?Yes. The 1/8 dia 1/8 thick diametric neodymium magnet is highly credible under 2 mm air gaps; the 1/16" size is limited to short-gap cues and compact fixtures under 1 mm.Keep the first prototype gap near 1.0-1.5 mm for 1/8" sizes.
Can N52 compensate for loose mechanics?Only partly. Grade changes are smaller than the field loss caused by increasing gap on these sub-4 mm magnets.Reduce stand-off, increase magnet volume, or change the sensing geometry before relying on grade alone.
What public claim should be avoided?Avoid claiming a guaranteed mT value at a specific gap for these micro/small sizes unless the supplier provides measured data for the same fixture.Mark field-at-gap values as pending confirmation until fixture data exists.

Evidence and data source plan

Evidence sourceTime markerHow to use itKnown boundary
Texas Instruments TMAG5170 datasheetSpecs verified July 20, 2026Defines selectable magnetic field ranges for 3D Hall angle sensing. TMAG5170A2 supports ±75, ±150, and ±300 mT ranges, so fields above the selected range can clip angle calculations.The page uses ±300 mT as a practical upper guardrail, but the exact limit depends on the selected sensor orderable and range code.
JBF National neodymium cylinder catalogVerified July 20, 2026Confirms a public 1 in x 1 in diametrically magnetized cylinder catalog line, matching the alias geometry and direction language.The cited catalog line is N42, so it proves geometry and direction wording only. If the RFQ requires N52, verify grade, magnetization direction, and lot field data with the supplier.
Applied Magnets 1 in x 1 in Diametrically Magnetized Cylinder CatalogVerified July 20, 2026Documents a public 1 in x 1 in diametrically magnetized cylinder example with N42-class published BrMax and 90 lb pull-force context. The page uses it for geometry, orientation, and handling-risk evidence for the alias.It does not prove an N52 diametric catalog item or fixture mT value. The exact magnetic flux at a sensor gap must still be determined in the final assembly.
totalElement 1 x 1 in N52 cylinder catalogVerified July 20, 2026Lists a comparable 25.4 x 25.4 mm N52 cylinder with 6,350 Gauss surface field and 75.5 lb pull force, supporting the saturation and handling-risk screen.This reference is axially magnetized, so the page uses it only as comparable catalog surface-field and safety evidence. The final diametric side-field map must be measured in the fixture.
NIST SI unit guidanceCurrent public guidance checked June 24, 2026Use the exact inch relationship for conversion: 1 in = 25.4 mm, so 1/16 in = 1.5875 mm and 1/32 in = 0.79375 mm.This proves size conversion only; it does not predict magnetic flux density.
TI TIDA-060040 3D Hall angle reference designReference design TIDA-060040 checked June 24, 2026Supports 3D Hall angle-measurement geometry, magnet placement vocabulary, and the need to validate sine/cosine signal balance in the final mechanical stack.The public design material does not certify a universal 1/16 in diametric magnet field value; concentricity and gap still require fixture measurement.
Diametric magnet supplier drawings (e.g. K&J)Catalog convention checked June 24, 2026Confirm that diametric magnetization places north and south poles across the cylinder diameter rather than on the flat faces.Supplier drawings are useful for polarity orientation, but open catalog pages rarely certify mT at the buyer assembly gap.
Prototype gaussmeter or sensor fixtureRequired before drawing releaseMeasure the final assembled gap, polarity, and signal repeatability across tolerance and temperature extremes.Open-air estimates miss steel, shielding, PCB copper, tolerance, adhesive thickness, and adjacent magnets.
Page screening modelInternal estimator reviewed June 24, 2026Use the listed mT, thermal, and offset figures as early screening estimates to compare design directions before samples exist.These figures are not supplier-certified measurements and must be replaced by measured lot data before production release.

Source note: public supplier catalogs and device datasheets are appropriate for geometry, magnetization direction, and sensor threshold definitions. They are not enough to prove final field strength for a requested 1 in by 1 inch N52 cylinder diametrically magnetized, a 1/8 dia 1/8 thick, or a 1/16 x 1/32 diametric magnet inside a real assembly; that remains pending confirmation until the actual sensor, gap, housing, and magnet lot are measured together.

Send measured-gap RFQ

Sensor threshold comparison

The checker uses repeatable baselines so the page can compare options, but procurement should replace these with the exact datasheet limits for the chosen part. For example, TI Hall switch literature distinguishes BOP, BRP, and hysteresis; reed switch resources specify sensitivity in ampere-turns; AKM magnetometer families publish measurement range by axis and mode.

Sensor familyReal decision inputTool baselineLimitation to test
Digital Hall switchOperate/release point, hysteresis, sample rate6 mTA low-power switch can miss a short pulse if sampling rate and magnet speed are not checked.
Linear Hall sensorLinear range, sensitivity, saturation limit12 mTA stronger magnet can hurt accuracy if it pushes the output near saturation.
Reed switchOperate ampere-turns, release ampere-turns, orientation10 mTReed behavior is geometry-sensitive; test pull-in/drop-out with the real magnet path.
Magnetometer / compass ICMeasurement range, offset calibration, hard/soft iron error1.5 mTNearby steel and permanent magnets can dominate the intended micro-magnet signal.
Magnet PathReed Switch ContactsGreen areas represent the 3 pull-in/actuation zones (lobes)

Fit boundaries

Good fit

Side-mounted digital Hall switches, very compact index points, low-inertia rotating targets, and assemblies where the magnet can be keyed.

Conditional fit

Linear Hall position checks, reed switches, and magnetometers where calibration or gap control is available.

Poor fit

Large air gaps, unknown polarity orientation, high-temperature zones without grade validation, or safety-critical sensing without measurement data.

Alternative comparison

OptionBest forTradeoff
Diametric cylinder magnetRotary index, side-mounted Hall sensing, compact angle cuesOrientation must be controlled during assembly
Axial cylinder magnetEnd-on proximity, reed switch actuation, simple fixturingLess useful when the sensor reads from the cylinder side
Ring magnet, diametricShaft-through rotary sensing and encoder targetsHigher cost and tighter concentricity requirements
Magnet pair or molded targetHigher field margin or custom pole patternMore parts, tooling, and validation work
1 Pole-Pair (1 Cycle/rev)Multi-Pole (8-Pole Ring, 4 Cycles/rev)Rotary Encoder Output Signals Comparison

Risk controls before purchase order

Control three failure modes: wrong polarity orientation, undersized field margin, sensor saturation or pinch hazards on large N52 cylinders, and supplier substitution without a drawing note. Mitigate them with guarded/keyed fixtures, measured sensor output at tolerance extremes, and an RFQ that explicitly says diametrically magnetized, not axially magnetized.

Public sources used

Sources checked July 20, 2026. These references support conversion, threshold vocabulary, supplier geometry, and sensor-family boundaries. They do not replace a measured field map for the exact 1 in N52, 1/8, or 1/16 magnet assembly.

Texas Instruments TMAG5170 datasheet

Used for 3D Hall magnetic field range limits, including the ±300 mT A2 guardrail checked July 20, 2026.

JBF National neodymium cylinder catalog

Used to verify public supplier language for a 1 in x 1 in diametrically magnetized cylinder geometry; cited grade differs, so N52 must be confirmed in RFQ.

Applied Magnets 1 in x 1 in diametric cylinder catalog

Used for a public 1 in x 1 in diametrically magnetized cylinder example and handling-risk context; cited data is not treated as certified N52 diametric fixture data.

totalElement 1 in x 1 in N52 cylinder catalog

Used for comparable 1 in x 1 in N52 surface-field and pull-force risk context; final diametric side-field still requires measurement.

NIST SP 811 Appendix B conversion factors

Used for exact inch-to-millimeter conversion context.

Texas Instruments TIDA-060040 3D Hall angle reference design

Used for 3D Hall angle-measurement geometry, magnet placement context, and final fixture-validation framing (verified June 24, 2026).

Texas Instruments Hall-effect sensor datasheets

Used for BOP/BRP, hysteresis, sampling, and temperature threshold terminology.

HSI Sensing reed switch application notes

Used for reed operate/release and ampere-turn sensitivity framing.

AKM magnetic sensor datasheets

Used for magnetometer range and calibration boundary framing.

Scenario examples

Heavy-Duty Industrial Rotary Equipment

Premise

Requested 1 in by 1 inch N52 cylinder diametrically magnetized, TMAG5170 sensor

Process

Due to comparable catalog surface-field values around 635 mT, the sensor should start with a large >15 mm screening air gap. Mechanics must handle severe pinch hazards during assembly.

Result

Provides a strong signal through thick fluid or safety housings, but requires rigid mounting to prevent the extreme magnetic force from ripping the fixture apart.

Micro Hall switch in a compact cover

Premise

1/16 x 1/32 in diametric N52 magnet, 1 mm nominal gap

Process

Use the tool preset, keep the sensor on the curved side, and test operate/release through the plastic wall.

Result

Likely workable only if assembly tolerance stays tight and polarity is keyed.

High-Temperature Smart Valve Encoder

Premise

1/16 x 1/8 in NdFeB magnet, 120°C ambient, 1.5 mm gap

Process

Evaluate N42H grade to prevent thermal demagnetization, calculate field loss at 120°C (-12%).

Result

Standard N52 fails reversibility; upgrading to N42H ensures stable 8.6 mT signal at gap.

High-Resolution Medical Pump Joint

Premise

1/16 x 1/16 in diametric magnet, 3D linear Hall (TMAG5170)

Process

Align magnet end-of-shaft with 0.1 mm concentricity control, sample sine/cosine signals.

Result

Achieves <1° rotational accuracy. Key validation is shaft eccentricity tolerance.

Diametric magnet visual references

These images are selected from the current product image set by diametric and encoder-related filenames. Use them to clarify RFQ intent when describing micro cylinders, disc stacks, or ring-style sensing targets.

N52 diametric magnet cylinder batch for micro sensor validation
N52 diametric magnet cylinder batch for micro sensor validation
Diametric disc magnet size references for sensor selection
Diametric disc magnet size references for sensor selection
Diametric ring magnet option for encoder-style sensing
Diametric ring magnet option for encoder-style sensing

Engineering QA

Frequently Asked Questions

Physics & Dimensions

What is the surface field of a 1 in by 1 inch N52 cylinder diametrically magnet?

Comparable 1" diameter by 1" thick N52 axial cylinder catalog data lists about 6,350 Gauss (635 mT) surface field, while public 1" x 1" diametric variants in the evidence set are N42 and list BrMax plus pull-force context. Treat a requested N52 diametric version as a high-field RFQ risk until the supplier confirms grade, magnetization direction, and fixture field data.

Are 1/8" dia 1/8" thick and 1/16" diametric magnets the same topic?

Yes. Both the 1/8 dia 1/8 thick diametric neodymium magnets and 1/16 diametric magnets represent specific sizing queries inside the diametric magnet intent cluster. This canonical page covers all small diametric cylinder parameters to prevent duplicate pages.

What do 1/8 x 1/8 and 1/16 x 1/32 mean in millimeters?

For 1/8 x 1/8 in, it converts to exactly 3.175 x 3.175 mm under standard NIST conversion factors (1 inch = 25.4 mm). For 1/16 x 1/32 in, it converts to 1.5875 x 0.79375 mm. These are standard catalog references for sensor actuators.

Why was "1 8 dia 1 8 thick diametric neodymium magnets" merged here?

The search intent and design path for a 1/8 dia 1/8 thick diametric magnet is not separate from the general diametric magnet selection. Sourcing, air gap calculations, and sensor-matching rules are identical, so merging them avoids thin duplicate content.

What is the difference between residual flux density (Br) and surface gauss?

Br (e.g., 14,800 Gauss or 1.48 T for N52) is a material property representing closed-circuit magnetism. Surface gauss is the actual open-air density measured at the magnet surface (usually 2,500-3,500 Gauss for micro magnets), which decays rapidly with distance.

How does the field decay rate of a 1/16" magnet compare to a larger magnet?

Very small magnets act as magnetic point dipoles much closer to their surfaces. This means their field strength decays by the inverse cube of the distance (1/z³) almost immediately, whereas larger magnets decay slower in the near field.

How do you model 1/8" or 1/16" micro-cylindrical fields at small air gaps?

For small diametric magnets, the magnetic dipole model (Bx, By proportional to 1/z³) is only valid when the distance z is at least 3 times the magnet diameter (z > 9 mm for 1/8" magnets). At sub-2 mm gaps, one must use charge models or finite element analysis (FEA) because near-field boundary effects dominate.

Sensor Matching

Can I use a 1 in by 1 inch N52 diametric magnet with a standard 3D Hall angle sensor?

Yes, but only with a controlled air gap, supplier-confirmed diametric N52 data, and a measured field map. A TMAG5170A2-class 3D Hall angle sensor uses ranges up to ±300 mT, while comparable 1"x1" N52 axial catalog surface field is already around 635 mT. Start with a large spacing, typically around >15 mm, or choose a smaller/weaker magnet if the package cannot provide that clearance.

Which sensor works best with a diametric cylinder magnet?

Side-mounted Hall sensors and 3D angle sensors (like TMAG5170) are the most common fit. Reed switches can work, but their spatial lobes make orientation highly sensitive.

Does N52 always solve a weak signal?

No. Upgrading from N35 to N52 increases field strength by about 30%, but increasing the air gap by just 0.5 mm can reduce field strength by 50% or more. Mechanical gap control is primary.

Can the calculator replace a magnetic simulation?

No. The calculator is an analytical estimator for quick screening. Highly critical sensor designs should use finite element analysis (FEA) or real-world gaussmeter fixtures.

What is the minimum field strength needed to trigger a Hall-effect switch?

Standard digital Hall switches trigger between 3 mT and 10 mT. Highly sensitive ones can trigger at 1.5 mT, while low-sensitivity industrial switches might require 20 mT.

How do linear Hall sensors behave near a rotating diametric magnet?

A rotating diametric magnet produces sinusoidal flux components (Bx, By) relative to the sensor. High-resolution encoders calculate the arctangent of these signals to determine angle.

How does sensor switch threshold sensitivity (e.g., 1.5 mT vs 10 mT) affect air gap tolerance?

Using a 1/8" x 1/8" (D22-DIA) N52 magnet at 1.0 mm gap yields ~65 mT, giving excellent margin for a 10 mT industrial switch. However, at 2.0 mm, the field drops to 4.8 mT, requiring a high-sensitivity sensor (Bop <= 3.0 mT). This leaves the system vulnerable to external EMF noise, making gap enforcement critical.

Assembly & Tolerances

What is the biggest assembly risk?

Polarity orientation and eccentricity offset. A diametric magnet must be keyed or aligned so the poles rotate correctly relative to the sensor axis, and offset must be minimized.

Can a diametric magnet be used for angle sensing?

Yes, especially with side or center-reading magnetic angle sensors. Accuracy depends on concentricity, air gap, field strength, and calibration.

What is the impact of radial alignment offset (eccentricity)?

Concentricity errors skew the sine/cosine signal balance, leading to angle errors. A 0.2 mm radial offset can cause up to 1.5 degrees of encoder angular error.

How does adhesive thickness affect the magnetic air gap?

Adhesive layers (usually 0.05 to 0.15 mm) add directly to the physical air gap. For a 1/16" micro magnet, this represents a significant fraction of the usable field distance.

Why is axial displacement more critical than radial offset in short cylinder assemblies?

For a short cylinder (1/8" or 3.175 mm length), axial shift moves the sensor into the magnet's fringe fields where magnetic vectors bend sharply. This causes severe sine/cosine amplitude mismatch, leading to angular errors. Secure axial locking via steps or rings is vital.

Supply Chain & Sourcing

What should be included in an RFQ?

Send diameter, thickness, material grade, coating, magnetization direction (diametric), tolerance, operating temperature, sensor part number, nominal gap, and annual volume.

What evidence is still missing publicly?

Exact field at a given gap for a 1/16 x 1/32 magnet varies by material, coating, magnetizer, and fixture. Public catalog pages rarely prove final assembly performance.

What is the minimum next step after this page?

Build one fixture at the intended gap, verify polarity, record sensor output across tolerance extremes, then freeze the magnet drawing.

When should I choose axial instead?

Choose axial when the sensor reads the magnet from the flat face or when simple end-on proximity switching is the main requirement.

How can I ensure the supplier does not substitute axial magnetization?

Explicitly specify "DIAMETRICALLY MAGNETIZED" in bold on the engineering drawing and RFQ, and demand a sample run verification report.

Is there a simple physical method to test if a received 1/8" magnet is diametric or axial?

Yes. Place a known axially magnetized magnet near the curved side of the cylinder. If it is axially magnetized, it will attract only at the flat circular faces. If it is diametrically magnetized, it will self-align and snap to the sides along its N-S pole boundaries. Using a magnetic flux viewing film will also reveal a clear diametrical dividing line.

Related engineering paths

Where to go after the diametric magnet check

These internal paths keep the 1 in by 1 inch N52 cylinder diametrically magnetized alias inside the canonical diametric cluster while giving buyers practical next steps.

  • Diametric sensor magnetsMove from sizing logic into production constraints for side-to-side pole orientation.
  • Axially magnetized magnets calculatorCompare face-pole cylinders when the sensor reads on-axis flux instead of side flux.
  • Magnet engineering toolsUse adjacent calculators before turning the design screen into an RFQ package.
  • Sensor magnetization direction guideDecide when axial, diametric, radial, or multipole magnetization fits the sensor.
  • Magnetic encoder angle sensingMap diametric cylinders into rotary angle assemblies and validation plans.

RFQ path for the canonical diametric magnet page

Keep all size variants, including the 1 in by 1 inch N52 cylinder diametrically magnetized, the 1/16 diametric magnet (such as 1 16 x 1 32 diametric magnet), and 1/8 dia 1/8 thick diametric neodymium magnets, on this canonical URL. For sourcing, send the target sensor part, nominal gap, operating temperature, drawing, and required annual volume so the quote can be checked against the real sensing boundary.

1. DimensionsDia & Thk + tolerances2. DirectionMust specify Diametric3. Material/Gradee.g. N52, N42H4. CoatingNiCuNi, Epoxy, etc.5. Temp LimitsMax operating temperature6. Annual VolumeSourcing target quantity

Inquiry Email

[email protected]

Email app

Include drawing, dimensions, material, coating, magnetization, quantity, and delivery location.

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The alias anchors 1 in x 1 in diametrically magnetized cylinder, 1 16 diametric magnet and 1/8" dia 1/8" thick diametric neodymium magnet resolve to this same canonical page. No dedicated alias routes are published.