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Created with Pixso. FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143

FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143

Brand Name: NSK
Model Number: 708AT
Detail Information
Place of Origin:
CHINA&JAPEN
Product Name:
Precision Angular Contact Ball Bearing
Product Title:
FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing For NXT XP143
Brand Reference:
FUJI / NSK
Bearing Manufacturer:
NSK
FUJI Part Number:
H4218K
Full Bearing Model:
708ATYNDBMP5
Short Model:
708AT
Product Type:
Matched Angular Contact Ball Bearing
Bearing Structure:
Precision Ball Bearing
Arrangement:
Back-to-Back Duplex
Arrangement Code:
DB
Preload:
Medium
Preload Code:
M
Precision Grade:
P5
Highlight:

FUJI NSK precision bearing with P5 grade

,

precision bearing back-to-back duplex arrangement

,

SMT spare parts bearing for NXT XP143

Product Description
FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing for NXT XP143
FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143

The FUJI NSK 708ATYNDBMP5 H4218K precision bearing is designed for selected motion assemblies used in FUJI electronic component placement equipment. It is commonly referenced as a replacement bearing for specific FUJI NXT and XP143 configurations, although the exact installation axis or mechanical module should always be confirmed through the machine parts manual, assembly drawing, or removed bearing marking.

This compact angular contact ball bearing features an 8 mm inner diameter and a 22 mm outer diameter. The full NSK designation identifies a polyamide cage, back-to-back matched bearing arrangement, medium preload, and P5 precision class. These features make the bearing suitable for applications requiring controlled rigidity, accurate rotational guidance, and stable movement under combined radial and axial loads.

The bearing is intended for professional SMT machine repair, scheduled preventive maintenance, mechanical module rebuilding, and replacement of worn motion-system components. Correct installation helps maintain smooth movement, consistent positioning, and dependable production performance.

The verified commercial cross-reference connects NSK 708ATYNDBMP5 with FUJI spare-part reference H4218K. Public equipment listings associate the part with FUJI electronic-component mounting equipment, including selected NXT and XP143 applications. Because FUJI machine revisions may use different bearing arrangements, final compatibility must be checked before ordering.


Product Identification

Identification Item Product Information
Product Category Precision Angular Contact Ball Bearing
Equipment Brand Reference FUJI
Bearing Manufacturer NSK
Full Bearing Model 708ATYNDBMP5
FUJI Part Number H4218K
Simplified Search Model 708AT
Bore Diameter 8 mm
Outside Diameter 22 mm
Bearing Arrangement Back-to-Back Matched Set
Preload Level Medium Preload
Accuracy Class P5
Cage Type Polyamide Cage
Main Application SMT Mounter Motion Assembly
Referenced Machine Families Selected FUJI NXT and XP143 configurations
Installation Position Confirm according to machine BOM and assembly drawing
Ordering Unit Set or piece according to actual package marking

The NSK designation system identifies TYN as a polyamide cage, DB as a back-to-back duplex arrangement, M as medium preload, and P5 as a precision class. Back-to-back angular contact bearing arrangements can support radial loading and axial loading from both directions while providing higher moment rigidity than a face-to-face arrangement.


Cause — Why the Original Bearing Requires Replacement

Precision bearings operate continuously inside high-speed SMT placement equipment. Even when a bearing does not show visible external damage, its internal raceways, rolling elements, cage, lubrication condition, or preload relationship may gradually deteriorate.

A worn or incorrectly installed bearing can affect the stability of the motion assembly and may create positioning errors that appear to originate from a motor, encoder, ball screw, guide rail, or control system.

Common Causes of Bearing Wear

Cause Possible Mechanical Effect
Extended operating hours Raceway fatigue and gradual increase in vibration
Insufficient lubrication Higher friction, heat generation, and abnormal noise
Contaminated grease Surface damage to balls and raceways
Dust or foreign particles Irregular rotation and accelerated wear
Incorrect mounting force Brinelling, deformation, or preload variation
Incorrect bearing orientation Reduced axial support and unstable motion
Excessive belt or screw load Abnormal radial or axial loading
Shaft misalignment Uneven contact and localized raceway wear
Repeated machine collision Impact damage and reduced rotational accuracy
Improper storage Corrosion, grease deterioration, or contamination
Mixing unmatched bearings Inconsistent preload and reduced system rigidity
Incorrect replacement model Dimensional or performance mismatch

Typical Symptoms

Maintenance personnel may consider inspecting the bearing when one or more of the following conditions appear:

  • Abnormal mechanical noise during axis movement.
  • Increased vibration around the bearing housing.
  • Inconsistent positioning or repeated calibration deviation.
  • Excessive heat near the shaft or bearing seat.
  • Rough rotation when the mechanism is moved manually.
  • Increased motor load or servo current.
  • Recurring motion alarms without an obvious electrical fault.
  • Visible grease leakage or contaminated lubricant.
  • Axial play or radial looseness beyond the normal range.
  • Reduced placement stability after long operating periods.
  • Unusual resistance during acceleration or deceleration.
  • Repeated replacement of adjacent mechanical components.

These symptoms do not automatically prove that the bearing is defective. Motors, couplings, ball screws, belts, pulleys, guide rails, encoders, shafts, and mounting seats should also be inspected before the final repair decision.


Solution — Precision Replacement for Stable Machine Motion

Replacing a worn bearing with the correctly identified NSK 708ATYNDBMP5 H4218K helps restore the intended support and guidance of the affected FUJI mechanical assembly.

Unlike an ordinary general-purpose bearing, this model uses a matched angular contact configuration with controlled preload and precision accuracy. The matched arrangement is important because the bearing pair must work as one mechanical system. Installing an unmatched bearing with a different preload, cage, tolerance, or contact arrangement may change axis rigidity and running behavior.

Maintenance Benefits

Maintenance Requirement Product Solution
Restore smooth rotational movement Precision raceways and matched rolling elements
Support combined mechanical loads Angular contact ball-bearing construction
Improve assembly rigidity Back-to-back bearing arrangement
Control internal operating clearance Factory-defined medium preload
Reduce unnecessary movement P5 precision accuracy
Maintain repeatable axis response Stable rotational guidance
Simplify part identification Full NSK model and FUJI cross-reference
Support preventive maintenance Suitable for planned bearing replacement
Reduce incorrect substitutions Exact suffix identification
Improve procurement accuracy H4218K and 708ATYNDBMP5 cross-reference

Why the Full Model Number Matters

The simplified description “708AT” is not sufficient for accurate replacement procurement. Bearings sharing the same basic 708 series can have different cage materials, preload levels, matching arrangements, internal clearances, and accuracy grades.

For this reason, inquiries and purchase orders should specify:

NSK 708ATYNDBMP5 / FUJI H4218K

Using the complete model helps prevent substitution with a bearing that has the correct physical size but the wrong operating characteristics.


Specifications

Specification Description
Product Name Precision Angular Contact Ball Bearing
Equipment Reference FUJI SMT Mounter
Manufacturer NSK
Full Model Number 708ATYNDBMP5
FUJI Reference Number H4218K
Bearing Series 708
Bearing Type Angular Contact Ball Bearing
Bore Diameter 8 mm
Outside Diameter 22 mm
Width Confirm by NSK drawing or removed bearing
Rolling Element Precision Steel Balls
Ring Material Bearing Steel
Cage Design TYN Polyamide Cage
Arrangement Code DB, Back-to-Back Duplex
Preload Code M, Medium Preload
Accuracy Code P5 Precision Class
Load Capability Combined radial and axial loads
Axial Load Direction Both directions when used as the matched DB set
Mechanical Feature High rigidity and controlled rotational guidance
Primary Industry Electronics Manufacturing
Equipment Type SMT Pick-and-Place Machine
Application Reference Selected FUJI NXT and XP143 assemblies
Operating Environment Industrial electronic assembly line
Installation Method Professional mechanical installation required
Lubrication Follow original machine and bearing requirements
Condition New unless otherwise stated in quotation
Packing Protective individual or matched-set packaging
Compatibility Rule Confirm by BOM, bearing marking, and machine revision
Warranty Subject to quotation and supply condition

Important Technical Note

The 8 mm bore and 22 mm outer diameter are supported by available trade and product-identification records for NSK 708ATYNDBMP5. However, bearing width, installation direction, matching marks, preload orientation, lubrication method, and exact machine axis should be confirmed against the original bearing and FUJI service documentation before installation.


Bearing Model Code Explanation

Model Code Technical Meaning
708 Compact angular contact bearing series with 8 mm bore reference
A Angular contact design designation
TYN Polyamide cage
DB Back-to-back duplex matched arrangement
M Medium preload
P5 Precision accuracy class
H4218K FUJI spare-part cross-reference

The suffixes are essential to product selection. A standard 708 bearing without the correct matching, preload, cage, and precision codes should not automatically be considered an equivalent replacement.


Key Product Advantages

1. Exact Full-Model Identification

The product is identified by the complete NSK designation 708ATYNDBMP5 rather than only the shortened 708AT reference. This helps purchasing teams compare quotations correctly and reduces the risk of ordering a visually similar but technically different bearing.

2. Matched Back-to-Back Arrangement

The DB arrangement positions the bearing pair back-to-back. This structure provides support for radial loads, axial loads in both directions, and moment loads generated by the machine mechanism.

3. Controlled Medium Preload

The M suffix indicates medium preload. Preload reduces unwanted internal movement and increases assembly rigidity, supporting more stable mechanical guidance.

4. P5 Precision Accuracy

The P5 designation is intended for applications requiring greater dimensional and running accuracy than ordinary industrial bearings. This is important in SMT machinery where repeatable mechanical movement affects production stability.

5. Compact 8 mm Bore Design

The compact bearing size is suitable for precision motion assemblies where installation space is limited and accurate shaft support is necessary.

6. Professional SMT Maintenance Application

The H4218K cross-reference supports faster identification for FUJI equipment maintenance, spare-parts inventory, machine rebuilding, and emergency replacement.

7. Reduced Procurement Risk

Displaying both the NSK bearing model and FUJI part number allows maintenance engineers, distributors, and purchasing departments to cross-check the same item using different documentation systems.

8. Suitable for Preventive Maintenance

The bearing can be stocked as part of a planned maintenance program to reduce delays when vibration, noise, or mechanical wear is detected.


FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143FUJI NSK 708ATYNDBMP5 H4218K Precision Bearing with P5 Precision Grade and Back-to-Back Duplex Arrangement for NXT XP143

Application

The FUJI NSK 708ATYNDBMP5 H4218K is intended for precision mechanical assemblies in electronic-component placement equipment.

Main Application Areas

Application Area Function
FUJI SMT Mounter Maintenance Replacement of worn precision bearing sets
Selected NXT Assemblies Motion-system bearing support, subject to BOM confirmation
Selected XP143 Assemblies Mechanical axis or head-related support, subject to revision
Axis Rebuilding Restoration of shaft support and rotational guidance
Mechanical Module Repair Replacement during component-level overhaul
Preventive Maintenance Scheduled replacement before serious failure
Used Machine Refurbishment Restoration of mechanical operating condition
Production Line Spare Stock Emergency inventory for maintenance teams
Service Department Inventory Standardized bearing identification
SMT Equipment Resale Preparation Mechanical inspection and maintenance

Applicable Users

  • SMT machine owners.
  • Electronics manufacturing service providers.
  • PCB assembly factories.
  • FUJI equipment maintenance departments.
  • Independent SMT repair companies.
  • Machine refurbishment companies.
  • SMT spare-parts distributors.
  • Overseas service engineers.
  • Industrial automation maintenance teams.
  • Electronics production-line integrators.

Compatibility Statement

The H4218K bearing is publicly marketed for selected FUJI NXT and XP143 equipment, but individual machine generations, serial-number ranges, mechanical revisions, and axis assemblies may differ.

Before ordering, the buyer should provide at least one of the following:

  • A clear photograph of the removed bearing.
  • Full bearing marking from the bearing ring or package.
  • FUJI part number H4218K from the machine BOM.
  • Machine model and serial number.
  • Mechanical assembly name.
  • Axis or installation position.
  • Parts-manual screenshot.
  • Required quantity per assembly.

How It Works

Angular contact ball bearings use raceways that are offset relative to each other. The contact line between the balls and raceways is positioned at an angle to the radial plane. This allows the bearing to support radial loading together with axial loading.

A single angular contact bearing normally supports axial force primarily in one direction. In a back-to-back matched set, two bearings are installed in opposing directions. The pair can therefore support axial forces from both directions and provide improved resistance to overturning moments.

Operating Sequence

Stage Bearing Function
1. Motor or mechanism begins moving Shaft transfers rotational or motion-related load
2. Inner ring rotates or supports the shaft Rolling elements move along precision raceways
3. Radial load enters the bearing Balls distribute the load through the raceway contact points
4. Axial load is generated Angular contact geometry transfers thrust through the bearing
5. Opposing bearing supports reverse thrust DB arrangement controls axial force in both directions
6. Medium preload removes excess clearance Mechanical rigidity and response are stabilized
7. P5 accuracy controls running behavior Rotation remains more consistent and repeatable
8. Lubrication separates contact surfaces Friction, wear, and heat generation are reduced

Function of the Back-to-Back Arrangement

A back-to-back bearing pair has a relatively wide distance between its effective load centers. This provides stronger moment-load capability and supports a rigid mechanical arrangement.

For SMT equipment, this can contribute to:

  • Stable shaft support.
  • Controlled axial movement.
  • Reduced unwanted play.
  • Consistent acceleration and deceleration.
  • Improved response during repeated operating cycles.
  • Better mechanical repeatability after correct installation.
  • More predictable servo behavior.
  • Reduced vibration caused by excessive internal clearance.

Function of Preload

Preload applies a controlled internal force to the matched bearing set before the external operating load is introduced.

The intended effects include:

  • Increasing mechanical rigidity.
  • Reducing axial displacement.
  • Controlling internal clearance.
  • Improving running stability.
  • Reducing rolling-element skidding.
  • Supporting repeatable motion.
  • Improving response during directional changes.

Preload should not be added arbitrarily during installation. The bearing set already has a specified matched condition, and excessive assembly pressure may create abnormal heat, torque, or premature failure.


Installation Recommendations

Installation should be performed by a technician familiar with precision bearing handling and FUJI equipment maintenance.

Before Installation

  1. Confirm the full model 708ATYNDBMP5.
  2. Confirm the FUJI reference H4218K.
  3. Compare the new bearing with the removed bearing.
  4. Check the package for matched-set marks.
  5. Verify the installation direction.
  6. Inspect the shaft and housing for damage.
  7. Measure the shaft and housing fit when necessary.
  8. Clean the work area and installation tools.
  9. Confirm the correct lubricant requirement.
  10. Review the machine service manual.

During Installation

  • Do not apply mounting force through the balls.
  • Apply force only to the ring being press-fitted.
  • Do not separate or mix matched bearing pairs.
  • Keep the matching marks and orientation visible.
  • Avoid direct hammer impact.
  • Use a clean bearing heater or precision press when required.
  • Protect the raceways from metal particles and dust.
  • Do not touch cleaned surfaces with contaminated gloves.
  • Do not wash out factory lubricant unless specified.
  • Tighten related components according to service specifications.

After Installation

Inspection Item Acceptance Check
Manual Rotation Smooth movement without sticking
Abnormal Noise No scraping, clicking, or rough sound
Axial Movement Within the machine’s specified range
Temperature No rapid abnormal temperature increase
Servo Load Stable compared with normal machine condition
Calibration Completed successfully
Motion Test Smooth acceleration and deceleration
Production Trial Stable operation under controlled test conditions
Fastener Check Correctly tightened and secured
Lubrication Check Correct type and quantity applied

How to Choose

Choosing a bearing only by outer appearance or basic dimensions is not recommended. The complete suffix affects internal construction and performance.

Selection Checklist

Selection Point Required Confirmation
Equipment Brand FUJI
Machine Model NXT, XP143, or other confirmed model
Machine Serial Number Recommended for revision checking
FUJI Part Number H4218K
NSK Model 708ATYNDBMP5
Bore Diameter 8 mm
Outside Diameter 22 mm
Arrangement DB back-to-back matched set
Preload M medium preload
Precision P5
Cage TYN polyamide
Quantity Confirm whether one matched set or individual piece
Installation Axis Confirm from parts manual
Condition Required New or another agreed condition
Packaging Original or protective industrial packaging
Delivery Requirement Standard or urgent shipment

Do Not Substitute Based Only on These Factors

  • Same inner diameter.
  • Same outer diameter.
  • Similar bearing appearance.
  • Same basic 708 number.
  • Lower purchase price.
  • Unverified seller description.
  • Similar FUJI machine model.
  • Similar mechanical axis.
  • Bearing without visible suffix marking.
  • Mixed bearings from different sets.

Recommended Inquiry Information

For faster and more accurate quotation, send:

Information Example
Product Name FUJI precision bearing
FUJI Part Number H4218K
Bearing Model NSK 708ATYNDBMP5
Machine Model FUJI NXT or XP143
Machine Serial Number Provide from machine label
Installation Position X-axis, Z-axis, head, or module name
Quantity Number of pieces or matched sets
Required Condition New
Destination Country Import destination
Delivery Deadline Required arrival date
Product Photo Bearing and package markings
Additional Parts Shaft, housing, screw, belt, or motor

Quality Inspection

Before shipment, the bearing should be checked according to the agreed supply condition.

Recommended Inspection Items

Inspection Item Inspection Purpose
Model Marking Confirm 708ATYNDBMP5
Part Cross-Reference Confirm H4218K
Package Label Verify manufacturer and model
Bearing Surface Check for rust, dents, or contamination
Rotation Condition Confirm smooth manual rotation
Pair Identification Confirm matched bearing relationship
Dimensions Verify critical installation dimensions
Cage Condition Check visible cage damage
Packing Protection Prevent moisture and impact
Quantity Confirm pieces or matched sets
Photo Record Support shipment verification
Final Label Prevent warehouse picking errors

Storage Recommendations

  • Store in a clean and dry indoor environment.
  • Keep the bearing inside protective packaging until installation.
  • Avoid direct contact with water or corrosive chemicals.
  • Do not place heavy products on the bearing package.
  • Prevent shock and vibration during storage.
  • Maintain clear warehouse identification.
  • Keep matched sets together.
  • Use first-in, first-out inventory control.
  • Avoid unnecessary package opening.
  • Inspect long-stored parts before installation.

Frequently Asked Questions

1. What is the complete model number of the H4218K bearing?

The complete NSK bearing model is 708ATYNDBMP5. “708AT” is only a shortened reference and does not show the cage, matched arrangement, preload, or precision class. Purchase orders should use the full model number together with FUJI part number H4218K.

2. Is H4218K suitable for every FUJI NXT or XP143 machine?

No. Public spare-parts listings associate H4218K with selected FUJI NXT and XP143 applications, but the exact axis, mechanical module, serial-number range, and machine revision may differ. Compatibility should be confirmed by the original bearing marking, FUJI BOM, or service manual.

3. What do DB, M, and P5 mean?

DB indicates a back-to-back matched bearing arrangement. M indicates medium preload, and P5 indicates a precision accuracy class. These suffixes affect rigidity, operating clearance, and running accuracy, so they should not be omitted when selecting a replacement.

4. Can a standard 708 bearing replace 708ATYNDBMP5?

A standard 708 bearing should not be treated as an automatic replacement. It may have a different contact design, cage, preload, matching arrangement, or precision grade. Even when the external dimensions appear similar, the machine’s motion performance may be different.

5. What information is required before quotation?

Please provide the full bearing marking, FUJI part number, machine model, serial number, installation position, required quantity, product condition, and destination country. A photograph of the removed bearing and package label is strongly recommended for final verification.


Contact Us

Looking for a reliable FUJI H4218K bearing for SMT machine maintenance?

Send us your machine model, serial number, required quantity, installation position, and a clear photo of the removed bearing. Our team will cross-check the NSK 708ATYNDBMP5 identification before quotation and help reduce the risk of ordering an incorrect specification.

We support:

  • Fast model verification.
  • Professional SMT spare-parts consultation.
  • New bearing supply.
  • International export packaging.
  • Worldwide delivery options.
  • Urgent maintenance inquiries.
  • Multi-item spare-parts quotations.
  • FUJI machine parts consolidation.
  • Product photos before shipment.
  • Commercial invoice and packing-list preparation.

Contact SMT PARTS SUPPLY LTD. today for availability, pricing, delivery time, and technical confirmation.

Inquiry Template

Inquiry Field Customer Information
Required Product FUJI NSK 708ATYNDBMP5 H4218K Bearing
Machine Model
Machine Serial Number
Installation Position
Quantity
Required Condition
Destination Country
Delivery Deadline
Removed Bearing Photo Attached / Not Attached
Additional Requirements

Compatibility and Trademark Disclaimer

FUJI and NSK names, machine models, and part numbers are used only for product identification and compatibility reference. This product page does not imply sponsorship, authorization, or affiliation unless specifically stated in the commercial quotation.

Machine compatibility can vary by production year, serial number, assembly revision, and maintenance history. Buyers should confirm the exact bearing model and FUJI part number before purchase. Final installation should be completed by qualified maintenance personnel.