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All Metal Self Locking Nuts

JX-DN Square Precision Lock Nuts – Radial-Locking Bearing Nuts

JX-DN square precision lock nuts provide accurate axial retention for ball screw support bearings and compact shaft assemblies. 

Made from quenched-and-tempered C45 steel, they feature ISO 4H internal threads, precision-machined contact faces and radial locking screws acting through phosphor bronze inserts.

 The original catalog covers metric M5–M40 thread options. Face-runout and hardness requirements are drawing-dependent. 

Custom inch-thread configurations can be reviewed for OEM manufacturing.


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Product Specification

JX-DN Square Precision Lock Nuts – Radial-Locking Bearing Nuts

C45 Steel Precision Shaft Locknuts with Phosphor Bronze Locking Inserts for Ball Screw Support Bearings and Industrial Motion Systems

JUXIN FASTENERS supplies JX-DN Series square precision lock nuts for ball screw bearing support housings, precision shaft assemblies and industrial motion-control equipment.

The JX-DN Series features a compact square external profile and a radial locking mechanism that uses screw-actuated copper-alloy locking elements to engage the mating shaft threads.

Unlike conventional hexagonal nuts or ordinary all-metal prevailing-torque locknuts, the JX-DN Series is designed for precision shaft positioning and controlled axial retention.

The internal thread and bearing-contact end face are precision-machined to support accurate assembly.

The original JUXIN FASTENERS technical catalog lists metric fine-thread sizes from M5 through M40, C45 steel construction, 

ISO 4H internal thread accuracy and precision face-runout references of 0.002–0.005 mm.

JX-DN square precision locknuts are particularly relevant to ball screw support bearings, precision machinery, 

CNC equipment, automated production systems and other applications requiring compact bearing-retention components.

Product Technical Specifications

ParameterJX-DN Series
Product NameJX-DN Square Precision Lock Nuts
Alternative NamesSquare Bearing Lock Nuts, Radial-Locking Precision Locknuts
SeriesJX-DN
External GeometrySquare Profile
Body MaterialDIN C45 Carbon Steel
Heat TreatmentQuenched and Tempered
HardnessHRC 24–28 in Original Catalog; HRC 28–32 in Supplied Product Text
Internal Thread AccuracyISO 4H
Manufacturing MethodPrecision Turning
Face Runout0.002–0.005 mm Catalog Reference
Locking MechanismRadial Screw-Actuated Locking
Locking Insert MaterialPhosphor Bronze per Original Catalog
Locking Screw GradeProperty Class 12.9 per Original Catalog
Surface FinishSandblasted and Blackened, Subject to Drawing
Catalog Metric RangeM5–M40
Inch Thread OptionsCustom Review, Not Standard Catalog Sizes
Primary ApplicationBall Screw Bearing Support Housings
CustomizationAccording to Approved OEM Drawings

Specification Control Notice

The original technical catalog and the supplied product description contain different hardness values.

The final hardness requirement must be confirmed from the current approved JX-DN engineering drawing.

Similarly, face-runout requirements must be defined by the specific model, manufacturing process, inspection datum and acceptance criteria.

What Is a Square Precision Lock Nut?

A square precision lock nut is a specialized internally threaded component used to retain bearings or other precision mechanical components on a threaded shaft.

Its square outer profile distinguishes it from conventional round precision bearing locknuts.

The JX-DN Series uses a separate radial locking mechanism rather than relying on permanent deformation of the main nut threads.

The nut is positioned on the mating shaft and tightened against the required bearing or support component.

After the correct axial position has been established, the radial locking screws are tightened.

The screws press phosphor bronze locking elements against the shaft threads to resist unwanted rotation.

Key Engineering Features

  • Compact square body.

  • Precision internal threads.

  • Precision-machined bearing-contact face.

  • Radial screw-actuated locking.

  • Copper-alloy thread-contact elements.

  • Suitable for selected repeated adjustment applications.

  • No separate locking washer or shaft keyway required by the basic locking concept.

  • Metric fine-thread catalog configurations.

  • Custom dimensional options for OEM assemblies.

Square External Geometry

The square shape provides four external faces and a compact geometry suited to selected bearing support housings.

Potential Advantages

  • Convenient external engagement during assembly.

  • Defined orientation within compatible support structures.

  • Compact integration into selected mechanical layouts.

  • Compatibility with customer-specific installation tooling.

Important Design Consideration

The square nut's outside dimensions, corner radii, installation clearance and locking screw access must be checked against the actual bearing support housing.

A square precision locknut is not necessarily dimensionally interchangeable with a round bearing locknut of the same thread size.

Radial Locking Mechanism

The JX-DN Series uses radial locking screws acting through copper-alloy contact elements.

The original catalog identifies phosphor bronze as the locking element material.

Phosphor bronze is a copper-based alloy commonly used in engineered components where controlled mechanical contact, 

wear characteristics and dimensional consistency are important.

How Radial Locking Works

  1. The nut is threaded onto the shaft.

  2. The nut is positioned against the bearing or specified mechanical component.

  3. The required axial position or preload is established.

  4. The radial locking screws are tightened according to the approved procedure.

  5. The phosphor bronze locking elements engage the mating shaft threads.

  6. The assembly is inspected to confirm its final position and locking condition.

Engineering Principle

The locking elements are intended to engage the shaft threads while reducing the need for direct contact between hardened steel locking screws and the mating thread surfaces.

The actual locking performance depends on insert geometry, screw torque, shaft material, thread accuracy and assembly conditions.

Two-Point Radial Locking Arrangement

Square precision locknuts commonly use two locking screws positioned approximately 90° apart.

The original JX-DN catalog identifies one locking screw for smaller models and two locking screws for larger models.

Therefore, the JX-DN Series should not be described as universally having two or three locking screws.

The exact locking arrangement depends on the selected part number.

Engineering Considerations

  • Number of locking screws.

  • Angular spacing.

  • Screw diameter.

  • Locking insert geometry.

  • Shaft-thread tolerance.

  • Locking torque.

  • Nut body stiffness.

  • Available installation clearance.

Why Precision Thread and Face Machining Matters

The nut's internal thread and bearing-contact face influence the accuracy of the complete assembly.

Manufacturing these features under controlled machining conditions helps reduce alignment errors between the thread axis and the bearing-contact surface.

Potential Benefits

  • Improved bearing seating.

  • More consistent axial positioning.

  • Reduced assembly variation.

  • Better control of contact-face runout.

  • Improved repeatability during production assembly.

Important Limitation

Precision machining does not independently guarantee the rotational accuracy of the assembled machine.

Shaft accuracy, bearing geometry, mounting conditions and preload also influence the final result.

DIN C45 Quenched-and-Tempered Steel

The original JX-DN specification identifies DIN C45 steel.

C45 is a medium-carbon engineering steel used for machined mechanical components.

Heat treatment can be used to obtain the required mechanical properties.

Material Selection Considerations

  • Chemical composition.

  • Heat-treatment condition.

  • Hardness.

  • Machinability.

  • Dimensional stability.

  • Mechanical strength.

  • Surface condition.

  • Thread performance.

Hardness Verification

The original JUXIN FASTENERS catalog lists HRC 24–28.

The supplied product text lists HRC 28–32.

These values should not be combined into an assumed HRC 24–32 acceptance range.

The required hardness must be confirmed from the current controlled engineering specification before production or inspection.

ISO 4H Internal Thread Accuracy

The JX-DN Series specifies ISO 4H internal threads.

The thread tolerance class is important because the locknut must fit the mating shaft accurately.

Thread Inspection Requirements

  • Nominal thread diameter.

  • Thread pitch.

  • Internal thread tolerance.

  • Thread form.

  • Pitch diameter.

  • Thread direction.

  • Mating shaft compatibility.

Important Engineering Note

ISO 4H describes the internal thread tolerance class.

It does not replace separate geometric tolerances for the nut's bearing-contact face, outside profile or locking screw positions.

Face Runout and Bearing Alignment

The original catalog identifies face-runout references of 0.002–0.005 mm.

The supplied product description specifies 0.005 mm.

Why Runout Matters

Excessive face runout may influence:

  • Bearing-ring seating.

  • Axial positioning.

  • Bearing preload distribution.

  • Rotational accuracy.

  • Assembly repeatability.

  • Bearing temperature and service life.

Inspection Requirements

The engineering drawing should define:

  • Measurement datum.

  • Contact-face reference.

  • Measurement equipment.

  • Inspection method.

  • Permissible runout.

  • Production acceptance criteria.

Important Qualification

Do not assume every JX-DN size is guaranteed to achieve 0.002 mm runout.

A 0.005 mm requirement should likewise be confirmed against the selected model and current drawing.

Original JX-DN Metric Thread Range

The following thread sizes and pitches are taken from the original JUXIN FASTENERS technical catalog.

JX-DN ModelMetric ThreadPitch
JX-DN-M5×0.5M5 × 0.50.5 mm
JX-DN-M6×0.75M6 × 0.750.75 mm
JX-DN-M8×0.75M8 × 0.750.75 mm
JX-DN-M8×1.0M8 × 1.01.0 mm
JX-DN-M10×0.75M10 × 0.750.75 mm
JX-DN-M10×1.0M10 × 1.01.0 mm
JX-DN-M12×1.0M12 × 1.01.0 mm
JX-DN-M15×1.0M15 × 1.01.0 mm
JX-DN-M17×1.0M17 × 1.01.0 mm
JX-DN-M20×1.0M20 × 1.01.0 mm
JX-DN-M25×1.5M25 × 1.51.5 mm
JX-DN-M30×1.5M30 × 1.51.5 mm
JX-DN-M35×1.5M35 × 1.51.5 mm
JX-DN-M40×1.5M40 × 1.51.5 mm

Important Size Note

These are the original catalog thread configurations.

Customers should confirm current production availability and the approved dimensional drawing before ordering.

Original JX-DN Dimensional References

The original technical catalog includes dimensional data for each thread configuration.

The following examples illustrate the differences between models.

ThreadCatalog DCatalog hLocking Screws
M5 × 0.513.5 mm5 mm1 × M3 × 0.5
M6 × 0.7514.5 mm5 mm1 × M3 × 0.5
M8 × 1.017 mm6.5 mm1 × M3 × 0.5
M10 × 1.020 mm8 mm2 × M4 × 0.7
M12 × 1.022 mm8 mm2 × M4 × 0.7
M15 × 1.025 mm8 mm2 × M4 × 0.7
M20 × 1.035 mm11 mm2 × M4 × 0.7
M25 × 1.543 mm15 mm2 × M5 × 0.8
M30 × 1.548 mm20 mmSee Current Drawing
M35 × 1.560 mm21 mm2 × M8 × 1.25
M40 × 1.570 mm25 mm2 × M8 × 1.25

Dimensional Qualification

The D and h designations follow the original catalog.

For M30, the catalog contains a locking-screw notation that should be checked against the engineering drawing before quotation.

The full drawing should be used to verify all remaining dimensions and tolerances.

Original Catalog Locking Torque References

The JX-DN catalog also includes locking screw tightening torque values.

Thread ConfigurationCatalog Locking Screw Torque
M5 × 0.50.9 Nm
M6 × 0.750.9 Nm
M8 × 0.75 / 1.00.9 Nm
M10 × 0.75 / 1.03.5 Nm
M12 × 1.03.5 Nm
M15 × 1.03.5 Nm
M17 × 1.03.5 Nm
M20 × 1.03.5 Nm
M25 × 1.54.5 Nm
M30 × 1.58 Nm
M35 × 1.518 Nm
M40 × 1.518 Nm

Critical Torque Note

These values are original catalog references, not universal tightening instructions.

Before installation, confirm the current drawing, screw size, screw grade, lubrication condition and approved tightening procedure.

Do not confuse the locking screw tightening torque with the torque used to establish bearing preload.

Maximum Axial Load

The original catalog includes maximum axial load values for individual JX-DN models.

However, the definition, test method, safety factor and application conditions associated with these values must be confirmed before using them as allowable design loads.

Engineering Requirement

For a load-critical bearing assembly, verify:

  • Actual operating axial load.

  • Static and dynamic load conditions.

  • Shaft thread strength.

  • Bearing capacity.

  • Locknut engagement.

  • Locking mechanism performance.

  • Applicable safety factor.

  • Manufacturer-approved load rating.

American Inch-Series Precision Locknut References

In the United States, precision shaft locknuts may use Unified inch threads.

Relevant thread systems include:

  • UNF – Unified National Fine.

  • UNEF – Unified National Extra Fine.

  • UNS – Unified Special Thread Series, where applicable.

Common American Thread References

Inch ThreadNominal DiameterThreads per Inch
1/4"-28 UNF0.250 in28
5/16"-24 UNF0.3125 in24
3/8"-24 UNF0.375 in24
7/16"-20 UNF0.4375 in20
1/2"-20 UNF0.500 in20
1/2"-28 UNEF0.500 in28
5/8"-18 UNF0.625 in18
5/8"-24 UNEF0.625 in24
3/4"-16 UNF0.750 in16
3/4"-20 UNEF0.750 in20
7/8"-14 UNF0.875 in14
7/8"-20 UNEF0.875 in20
1"-12 UNF1.000 in12
1"-20 UNEF1.000 in20

Inch-Series Supply Qualification

The original JX-DN catalog lists metric sizes only.

The inch-thread designations above are relevant engineering references for American customers.

They are not confirmed JX-DN standard sizes or stock items.

Custom inch-thread production must be reviewed against the customer's shaft drawing, nut dimensions, locking screw arrangement and order requirements.

Metric and Inch Thread Compatibility

Metric fine threads and Unified inch threads cannot be directly interchanged.

For example:

  • M6 × 0.75 is not interchangeable with 1/4"-28 UNF.

  • M8 × 1.0 is not interchangeable with 5/16"-24 UNF.

  • M10 × 1.0 is not interchangeable with 3/8"-24 UNF.

  • M12 × 1.0 is not interchangeable with 1/2"-20 UNF.

  • M25 × 1.5 is not interchangeable with 1"-12 UNF.

Always confirm the actual mating shaft thread specification.

JX-DN vs. JX-YCF Precision Locknuts

JUXIN FASTENERS offers different precision locking configurations for different shaft and bearing arrangements.

FeatureJX-DN SeriesJX-YCF Series
External ShapeSquareRound
Primary Locking DirectionRadialApproximately 30° Flank Locking
Body MaterialC45SCM440
Locking Contact MaterialPhosphor Bronze per CatalogBrass Contact Elements
Primary ApplicationBall Screw Bearing Support HousingsPrecision Bearings and Shaft Assemblies
Thread AccuracyISO 4HISO 4H
RunoutDrawing-Dependent Precision RequirementDrawing-Dependent Precision Requirement

Engineering Insight

These two series should not be treated as interchangeable merely because their nominal thread sizes match.

Nut geometry, locking mechanism, face dimensions and shaft assembly requirements must all be checked.

JX-DN vs. Conventional Bearing Locknuts

Conventional bearing locknuts may use locking washers, tab washers or keyways.

The JX-DN Series uses radial locking screws and phosphor bronze inserts.

Potential Advantages

  • No separate tab washer required by the basic locking mechanism.

  • No shaft keyway required solely for the radial locking function.

  • Compact square geometry.

  • Precision-machined contact face.

  • Controlled locking after axial positioning.

Important Limitation

The elimination of a tab washer or keyway must be approved by the mechanical designer.

The JX-DN nut must still meet the required axial retention and operating conditions.

JX-DN vs. Ordinary Square Nuts

Ordinary square nuts are general-purpose threaded fasteners.

The JX-DN Series is a precision shaft-locking component.

Key Differences

  • Precision internal thread requirements.

  • Controlled bearing-contact face.

  • Dedicated radial locking screws.

  • Phosphor bronze locking inserts.

  • Precision bearing-retention applications.

  • Drawing-specific dimensional and geometric tolerances.

JX-DN locknuts should not be confused with square weld nuts, square cage nuts or general-purpose square machine nuts.

Industrial Applications and Engineering Solutions

1. Ball Screw Support Bearing Housings

Ball screw systems rely on accurately positioned support bearings.

Engineering Challenge

Incorrect axial positioning may contribute to backlash, positioning errors and bearing performance problems.

Potential Solution

JX-DN square precision locknuts may be used in compatible ball screw support bearing housings.

2. CNC Machine Tools

CNC equipment contains precision shafts, bearings and motion-control assemblies.

Engineering Challenge

Assembly accuracy and reliable axial retention are important for positioning repeatability.

Potential Solution

JX-DN locknuts may be selected for suitable bearing-support arrangements.

3. Precision Linear Motion Systems

Linear motion systems often use ball screws and bearing supports.

Potential Solution

Square precision locknuts may provide compact shaft-retention solutions where the housing design permits.

4. Industrial Automation Equipment

Automated machinery contains rotary shafts, bearing supports and positioning mechanisms.

Potential Solution

JX-DN locknuts may be used in compatible precision mechanical assemblies.

5. Industrial Robotics

Robotic equipment requires controlled mechanical positioning and stable bearing support.

Potential Solution

Precision locknuts may be evaluated for appropriate joint-support and motion-control assemblies.

6. Semiconductor Manufacturing Equipment

Semiconductor manufacturing systems contain precision motion mechanisms.

Engineering Challenge

Mechanical accuracy, cleanliness and repeatability may be critical.

Potential Solution

JX-DN locknuts may be considered for compatible bearing-support assemblies, subject to the equipment's cleanliness and material requirements.

7. Precision Assembly Machines

Automated assembly equipment uses accurate positioning systems.

Potential Solution

Square precision locknuts may support the retention of selected ball screw bearings.

8. Packaging Machinery

Packaging lines often contain high-cycle positioning mechanisms.

Potential Solution

JX-DN locknuts may be specified for compatible precision shaft assemblies.

9. Printing Machinery

Industrial printing systems require stable mechanical positioning.

Potential Solution

Precision locknuts may be used in appropriate bearing-support and motion-control components.

10. Inspection and Metrology Equipment

Inspection systems contain precision mechanical assemblies.

Potential Solution

JX-DN locknuts may be evaluated where compact shaft retention and controlled face runout are required.

11. Precision Grinding Machines

Grinding machinery relies on accurate motion systems.

Potential Solution

Square precision locknuts may be considered for approved ball screw support-bearing arrangements.

12. Optical Equipment Manufacturing

Optical manufacturing machinery may use high-accuracy linear motion systems.

Potential Solution

JX-DN locknuts may be used in compatible precision bearing supports.

13. EV Motor Manufacturing Equipment

Electric motor production systems use automated positioning and assembly machinery.

Potential Solution

Precision bearing locknuts may be selected for suitable production-equipment motion systems.

14. Industrial Testing Equipment

Test benches and mechanical measurement systems may contain precision shafts.

Potential Solution

JX-DN locknuts may provide axial retention where their geometry and locking capacity meet the approved design.

15. Electronics Manufacturing Equipment

Electronics production lines use automated motion and positioning systems.

Potential Solution

Square precision locknuts may be evaluated for compatible ball screw support assemblies.

16. Medical Device Manufacturing Machinery

Precision manufacturing equipment for medical devices may use ball screw and bearing systems.

Potential Solution

JX-DN locknuts may be used in suitable manufacturing machinery, subject to equipment specifications.

17. Machine Tool Retrofit Projects

Maintenance and retrofit projects may require replacement bearing-retention components.

Potential Solution

JX-DN locknuts may be considered when the existing shaft thread, bearing-contact geometry and housing dimensions are compatible.

18. Custom OEM Motion-Control Assemblies

OEM manufacturers may require nonstandard precision shaft-locking components.

Potential Solution

JUXIN FASTENERS can review custom drawings for thread, body, locking mechanism and inspection requirements.

Installation and Assembly Guidelines

The installation procedure must follow the approved mechanical design and current JX-DN technical drawing.

Step 1 – Inspect the Nut

Check the internal threads, bearing-contact face, locking screws and phosphor bronze elements.

Step 2 – Inspect the Shaft

Verify the shaft thread, surface condition and dimensional accuracy.

Step 3 – Confirm Thread Compatibility

Check nominal diameter, pitch, tolerance and thread direction.

Step 4 – Position the Nut

Thread the nut onto the shaft and bring it into contact with the intended bearing or mechanical component.

Step 5 – Establish the Required Bearing Condition

Adjust the axial position or preload according to the bearing manufacturer's instructions.

Step 6 – Tighten the Radial Locking Screws

Use the approved tightening torque and sequence.

Step 7 – Verify the Assembly

Check the final axial position, bearing preload and locking condition.

Step 8 – Record Inspection Results

Document the required measurements for production traceability.

Important Installation Note

The catalog locking screw torque must not be confused with bearing preload adjustment torque.

Repeated Assembly and Reuse

The JX-DN radial locking mechanism may allow repeated installation and removal when handled correctly.

However, reuse depends on component condition and the approved maintenance procedure.

Inspect Before Reuse

  • Internal thread wear.

  • Phosphor bronze insert condition.

  • Locking screw damage.

  • Nut face damage.

  • Corrosion.

  • Shaft-thread condition.

  • Dimensional changes.

  • Runout requirements.

Damaged or out-of-tolerance components should not be reused in precision assemblies.

Surface Finish and Corrosion Considerations

The original product data describes sandblasting and blackening.

Technical Distinction

Sandblasting is a surface preparation process.

Blackening is a separate surface treatment.

The exact process should be confirmed from the approved manufacturing specification.

Engineering Considerations

  • Surface cleanliness.

  • Corrosion resistance.

  • Coating thickness.

  • Dimensional influence.

  • Storage conditions.

  • Contact-face condition.

A blackened steel surface should not be assumed suitable for severe outdoor, marine or chemically aggressive environments without additional corrosion protection and verification.

Quality Control and Inspection

Material Inspection

  • C45 material identification.

  • Material certification.

  • Heat-treatment condition.

  • Lot traceability.

Hardness Inspection

  • Confirmed HRC requirement.

  • Approved test method.

  • Measurement location.

  • Production acceptance criteria.

Thread Inspection

  • Nominal diameter.

  • Pitch.

  • ISO 4H tolerance.

  • Thread form.

  • Functional engagement.

Dimensional Inspection

  • Square outside dimensions.

  • Nut height.

  • Bearing-contact face.

  • Locking screw locations.

  • Internal thread position.

Geometric Inspection

  • Face runout.

  • Parallelism where specified.

  • Perpendicularity where specified.

  • Concentricity where specified.

Locking Mechanism Inspection

  • Phosphor bronze insert condition.

  • Locking screw grade.

  • Locking screw dimensions.

  • Locking screw torque.

  • Functional locking performance.

Surface Inspection

  • Blackened finish.

  • Surface defects.

  • Burrs.

  • Corrosion.

  • Cleanliness.

Important Quality Principle

Thread accuracy, face runout, parallelism and perpendicularity are different engineering requirements.

Each must be specified and inspected separately where relevant.

Common Problems and Engineering Solutions

Problem 1: Bearing Preload Changes After Locking

Possible Causes

  • Incorrect locking screw sequence.

  • Excessive screw torque.

  • Shaft-thread inaccuracies.

  • Incorrect bearing adjustment.

Recommended Action

Review the assembly procedure and verify the final bearing condition.

Problem 2: Nut Cannot Be Installed

Possible Causes

  • Incorrect thread pitch.

  • Damaged threads.

  • Incorrect shaft diameter.

  • Metric/inch thread confusion.

Recommended Action

Check the exact thread designation and tolerance.

Problem 3: Excessive Face Runout

Possible Causes

  • Incorrect nut geometry.

  • Damaged bearing-contact face.

  • Shaft error.

  • Contamination.

Recommended Action

Inspect the complete nut-and-shaft assembly using the specified datum.

Problem 4: Shaft Thread Damage

Possible Causes

  • Excessive locking torque.

  • Damaged phosphor bronze insert.

  • Incorrect thread fit.

  • Improper installation.

Recommended Action

Inspect the locking mechanism and follow the approved torque procedure.

Problem 5: Locking Screw Failure

Possible Causes

  • Incorrect tool.

  • Excessive torque.

  • Incorrect screw grade.

  • Thread contamination.

Recommended Action

Verify the screw specification and installation procedure.

Problem 6: Insufficient Axial Retention

Possible Causes

  • Incorrect nut selection.

  • Insufficient locking force.

  • Inadequate shaft-thread engagement.

  • Excessive operating load.

Recommended Action

Review the complete joint design and load requirements.

Problem 7: Housing Interference

Possible Causes

  • Incorrect square outside dimensions.

  • Insufficient corner clearance.

  • Inaccessible locking screws.

Recommended Action

Check the full 2D/3D assembly before procurement.

Problem 8: Incorrect Hardness Requirement

Possible Causes

  • Conflicting product data.

  • Uncontrolled drawing revision.

Recommended Action

Confirm the current approved engineering drawing before manufacturing.

Problem 9: Corrosion During Storage

Possible Causes

  • Inadequate packaging.

  • Moisture exposure.

  • Insufficient corrosion protection.

Recommended Action

Review packaging, storage and approved surface treatment requirements.

Problem 10: Unexpected Bearing Vibration

Possible Causes

  • Incorrect preload.

  • Shaft runout.

  • Bearing damage.

  • Misalignment.

  • Nut face error.

Recommended Action

Evaluate the complete bearing assembly rather than assuming the locknut is the sole cause.

Production Manager Considerations

Production managers evaluating JX-DN square precision locknuts should consider:

  • Dimensional repeatability.

  • Thread inspection efficiency.

  • Locking screw accessibility.

  • Assembly cycle time.

  • Bearing preload repeatability.

  • Rework rates.

  • Inspection documentation.

  • Supplier lot consistency.

  • Packaging protection.

  • Delivery reliability.

Engineering Insight

A precision locknut's total manufacturing value depends on assembly accuracy, inspection reliability and reduced production variation, not simply its unit price.

OEM Procurement Checklist

For accurate supplier evaluation, specify:

  • JX-DN model number.

  • Approved 2D drawing.

  • 3D CAD model where available.

  • Metric or inch thread.

  • Thread pitch.

  • Thread tolerance.

  • Square outside dimensions.

  • Nut height.

  • Bearing-contact face geometry.

  • Face-runout tolerance.

  • Material grade.

  • Heat-treatment condition.

  • Hardness requirement.

  • Locking screw quantity.

  • Locking screw size.

  • Locking screw grade.

  • Locking screw torque.

  • Phosphor bronze insert requirements.

  • Surface finish.

  • Maximum axial load requirement.

  • Inspection documentation.

  • Packaging.

  • Initial order quantity.

  • Annual purchasing volume.

  • Delivery schedule.

Custom JX-DN Square Precision Locknuts

JUXIN FASTENERS welcomes customer-specific precision locknut inquiries.

Potential customization includes:

  • Metric fine threads.

  • Custom inch threads.

  • Custom square outside dimensions.

  • Custom nut heights.

  • Precision bearing-contact faces.

  • Radial locking screw arrangements.

  • Phosphor bronze locking inserts.

  • Customer-specified C45 material conditions.

  • Drawing-defined hardness.

  • Precision face-runout tolerances.

  • Blackened surface finishes.

  • Special packaging.

  • Dimensional inspection reports.

  • OEM production quantities.

All custom requirements are subject to technical review and manufacturing feasibility confirmation.

Frequently Asked Questions

What is a JX-DN square precision locknut?

It is a square-profile precision shaft locknut with a radial screw-actuated locking mechanism.

What is the American name for this product?

Square Precision Lock Nut, Square Bearing Lock Nut and Radial-Locking Precision Locknut are relevant terms.

Is this an F-type precision locknut?

No. The JX-DN Series uses radial locking and should be distinguished from 30° flank-locking designs.

What is the primary application?

Ball screw bearing support housings and compatible precision shaft assemblies.

What material is used?

The original catalog specifies DIN C45 steel.

What hardness is specified?

The original catalog states HRC 24–28, while the supplied product text states HRC 28–32. The current drawing must resolve this difference.

What is the thread accuracy?

ISO 4H.

What is the face-runout specification?

The original catalog lists 0.002–0.005 mm references. The actual acceptance value must be confirmed for each model.

What material is used for the locking inserts?

The original catalog identifies phosphor bronze.

What grade are the locking screws?

The original catalog identifies property class 12.9.

Does every JX-DN nut have two locking screws?

No. The original catalog shows one locking screw for smaller models and two for larger models.

What metric sizes are listed?

The original catalog includes selected fine-thread configurations from M5 to M40.

Are inch sizes available?

Custom UNF, UNEF or other inch-thread requirements may be reviewed against customer drawings.

Can metric and inch threads be substituted?

No.

Can JX-DN nuts be reused?

Potentially, if the components remain within the approved inspection and reuse requirements.

Do they require locking washers?

The radial locking mechanism is designed to avoid the need for a separate locking washer in suitable assemblies.

Can JUXIN FASTENERS manufacture custom dimensions?

Customer-specific drawings can be reviewed for manufacturing feasibility.

Can OEM customers request bulk quantities?

Yes. JUXIN FASTENERS welcomes industrial OEM and long-term production supply inquiries.

Related Industrial Fastening Solutions

JUXIN FASTENERS supplies related precision and industrial fastening components:

  • JX-YCF Precision Bearing Lock Nuts.

  • All-Metal Self-Locking Nuts.

  • Industrial Hex Nuts.

  • Specialty Lock Nuts.

  • Custom CNC Machining Parts.

  • Thread Repair Inserts.

  • Self-Clinching Fasteners.

  • Weld Fasteners.

  • Custom Threaded Components.

Related internal links should be added only after verifying the live page URLs.

Request a JX-DN Square Precision Locknut OEM RFQ

JUXIN FASTENERS supports international OEM manufacturers, precision machinery builders, mechanical engineers, production managers, purchasing engineers and supply chain teams.

For accurate technical evaluation and quotation, please provide:

  • JX-DN model number.

  • 2D engineering drawing.

  • 3D CAD model, if available.

  • Application and equipment type.

  • Shaft nominal diameter.

  • Thread pitch and tolerance.

  • Square outside dimensions.

  • Nut height.

  • Bearing-contact face dimensions.

  • Required face runout.

  • Material and hardness requirements.

  • Locking screw quantity and size.

  • Locking screw torque.

  • Phosphor bronze insert requirements.

  • Surface finish.

  • Axial load requirements.

  • Inspection and certification requirements.

  • Initial purchasing quantity.

  • Estimated annual volume.

  • Packaging requirements.

  • Delivery schedule.

Our technical sales team can review dimensional accuracy, material specifications, manufacturing feasibility, inspection requirements and production-volume quotations.

JUXIN FASTENERS

Website: https://www.juxinfasteners.com/

Email: info@juxinfasteners.com

Submit Your JX-DN Precision Locknut Drawings and OEM Purchasing Requirements for a Technical RFQ.


Product Packaging

Packaging Standard

At Juxin Fasteners, we apply standardized export packaging to ensure product protection, traceability, and compliance with international logistics requirements.

1. Standard Export Packaging

Unless otherwise specified, all products will be packed according to our factory standard export packaging, which includes:

Moisture-resistant inner protection

Poly bag or small box packing as required

Reinforced export cartons

Clear labeling with part number, specification, batch number, and quantity

Palletizing for sea or air shipment when necessary

Our standard packaging is designed to ensure safe transportation, efficient warehousing, and long-distance international shipping.

2. Customized Packaging Options

We also provide customized packaging solutions according to customer requirements, including but not limited to:

Private labeling

Customized barcodes

Specific carton dimensions

Retail packaging

Special pallet configuration

Customer-specific marking and identification

So that you know, customized packaging may involve additional costs and extended lead time depending on the complexity of the requirements.

3. Compliance & Quality Assurance

All packaging processes are controlled under our ISO 9001 quality management system to ensure consistency, traceability, and product integrity throughout the supply chain.


Product Pictures

JX-DN Square Locking Nuts


JX-DN Square Locking Nuts

Contact Us

Tel.:

+86 020 8621 0320

+86 020 3121 6067

Mobile: +86 136 6007 9809

Technical Support:

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