Description
Authorized Channel Traceability — Batch-level documentation accompanies every NSK 7200ATYNSULP4 shipment, confirming origin and authenticity through verifiable supply chain records rather than unverified resale stock.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | NSK 7200ATYNSULP4 |
| Bearing Type | Angular Contact Ball Bearing |
| Bore Diameter (d) | 10 mm |
| Outside Diameter (D) | 26 mm |
| Width (B) | 8 mm |
| Weight | 0.009 kg |
| Number of Rows | Single |
| Load Direction | Combined Radial and Axial Load |
| Material | Bearing Steel |
| Cage Material | Polyamide (TYN) |
| Seal or Shield Type | Open |
| Clearance Class | SU (Single Universal) |
| Precision Class | P4 |
| Contact Angle | 15° (A suffix) |
| Arrangement | Single Universal (SU) |
| Bore Type | Cylindrical |
| Origin | To be confirmed per batch documentation |
The suffix block TYNSULP4 contains segments whose exact factory meaning should be verified against the current NSK precision catalog before final specification lock-in.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Machinery | CNC spindle front and rear journal support |
| Robotics | Joint actuator precision pivot positions |
| Precision Equipment | High-speed grinding wheelhead spindles |
| General MRO | Replacement bearings for OEM machine tool rebuilds |
What the Wrong Precision Grade Costs on a 10mm Spindle Journal
A P4-rated angular contact bearing is not interchangeable with P5 or P0 simply because the base number matches.
I once saw a furniture CNC shop in Binh Duong rebuild their spindle with bearings that matched the 7200 base designation perfectly — except the supplier shipped P0 grade while the OEM drawing specified P4. Three weeks into production, surface finish degraded, the spindle ran noticeably hotter, and the operator blamed the bearing brand entirely. The NSK 7200ATYNSULP4 angular contact ball bearing eliminates that risk when specified correctly from the start, but only if every suffix is checked against the machine builder’s original requirements [NEED_CITE: spindle bearing precision grade impact on surface finish quality].
Matching the 7200A Contact Angle to Spindle Load Profiles
The 15° contact angle on this NSK 7200ATYNSULP4 angular contact ball bearing suits spindle positions where radial loads dominate and axial thrust is secondary. In a typical CNC milling spindle, the front journal bears cutting forces that are predominantly radial with moderate axial components during drilling cycles. Higher contact angles would increase axial rigidity but also generate additional friction heat at sustained speeds — a trade-off that matters when the spindle operates near its thermal stability limit. We cross-check the contact angle requirement against the OEM drawing or the load spectrum the maintenance engineer provides, rather than assuming the base series alone is sufficient.
Thermal Behavior and Lubrication Demands at High Speed
Small-bore angular contact bearings in spindle service often run*cal. The polyamide cage (TYN suffix) keeps weight low and allows higher speed operation compared to brass alternatives, but it also sets an upper temperature boundary. Oil-air or oil-mist lubrication is standard in these applications, and the open design of this bearing allows flexible lubrication routing. Ambient temperature inside a machine tool enclosure can climb during extended machining cycles, and thermal expansion of the shaft relative to the housing directly affects internal clearance. The SU universal arrangement allows paired mounting with controlled preload to manage this expansion [NEED_CITE: angular contact bearing preload and thermal growth in spindle assemblies].
Decoding the Suffix Stack: A, TYN, SU, LP4
The A suffix confirms the 15° contact angle — distinct from the 25° or 40° variants used where heavier axial loads are present. TYN indicates a polyamide cage designed for high-speed precision service, chosen over machined brass when rotational speed matters more than extreme load capacity. The SU designation means this bearing is ground for universal single mounting, allowing matched pairs to be assembled in back-to-back or face-to-face configurations with predictable preload. LP4 confirms the precision class reaches ISO 492 class 4 tolerances, providing tighter bore and outside diameter dimensional accuracy along with improved running accuracy compared to P5 or standard grades. Together, these suffixes define a bearing built for positions where runout directly affects part quality.
The Hidden Expense of Unverified Spindle Bearings
Procurement teams sometimes source angular contact bearings based on base designation alone, treating suffixes as optional details. A standard-clearance P0 bearing installed where P4 precision and specific preload were required will not simply underperform — it can cause chatter marks on machined surfaces, accelerate seal wear from excessive shaft deflection, and lead to unplanned spindle teardowns weeks ahead of scheduled maintenance. ISO 15243 classifies these outcomes under installation and specification-related failures, distinct from normal fatigue [NEED_CITE: ISO 15243 bearing failure mode categories]. Counterfeit bearings with soft inner rings compound this problem, as cloned markings pass visual inspection while dimensional accuracy falls far below any recognized precision class.
How We Reduce Specification Risk for Precision Orders
Every NSK 7200ATYNSULP4 angular contact ball bearing we quote goes through suffix verification against the application parameters or OEM equipment number the buyer provides. Our sourcing runs through authorized distributor channels, meaning batch traceability documentation accompanies each shipment rather than being reconstructed after the fact. When a cross-brand substitution is necessary — perhaps the maintenance schedule cannot wait for the original brand’s lead time — our interchange database aligns clearance, cage material, and precision class simultaneously, not just the base number. Country-of-origin documentation ships with the order for import compliance, and we guide buyers through QR code verification using the manufacturer’s official application before installation begins.
Documentation & Authenticity
- Supplier Certificate of Conformity tied to the specific batch lot number on each NSK 7200ATYNSULP4 shipment
- Dimensional inspection records confirming P4 bore and OD tolerances before dispatch
- QR code verification pathway through NSK’s official mobile application for on-site authenticity checks
- Country-of-origin certificates prepared for customs clearance in destination markets
- Material test reports available upon request linking bearing steel grade to the production batch
Storage, Handling & Mounting
- Keep the 7200ATYNSULP4 in its original sealed packaging until the moment of spindle assembly — the polyamide cage attracts moisture if exposed to humid workshop air for extended periods
- Handle with clean lint-free gloves; fingerprint acids on the 10mm bore surface can initiate corrosion that compromises the P4 running accuracy
- For paired mounting in DB or DF arrangements, open both bearings simultaneously and align the factory-applied V-marks before pressing onto the shaft journal
- Use induction heating for shaft mounting rather than mechanical pressing; uneven force on the 26mm outer ring can distort the raceway and negate the P4 precision advantage
- Confirm residual internal clearance after mounting, as interference fit on the shaft reduces the operating clearance from the SU universal baseline
- Apply the specified spindle oil or grease immediately after mounting; the open design offers no contamination protection during idle storage
Request a Technical Review Before Ordering
Share your spindle speed range, load direction breakdown, and any OEM drawing references so we can confirm whether the 15° contact angle and P4 class match your specific position requirements. If you are replacing an existing bearing, send us the full designation printed on the original unit — including all suffixes — and we will verify interchangeability or flag any mismatches before quoting.
Frequently Asked Questions
Q: How do I confirm whether this NSK bearing is genuine before installation?
A: NSK provides an official verification application that reads the QR code on authentic product packaging. We supply the batch-level documentation needed to trace each bearing back through the authorized distribution chain, and we guide buyers through the verification process before mounting begins.
Q: What does the TYNSULP4 suffix combination indicate on this bearing?
A: The suffix stack breaks down into TYN for polyamide cage, SU for single universal mounting arrangement, L for light preload, and P4 for precision class. Some segments may have updated meanings in newer NSK catalogs, so we recommend confirming the exact interpretation against the current manufacturer documentation for your specific production batch.
Q: Can I substitute this NSK 7200A series with an equivalent from SKF or FAG?
A: Cross-brand substitution is possible but requires aligning the contact angle, cage material, precision class, and preload simultaneously — not just matching the 10x26x8mm envelope dimensions. We provide a complete interchange comparison that checks all suffix-equivalent parameters before recommending an alternative brand.
Q: When is P4 precision necessary versus standard P0 grade?
A: P4 is specified for applications where shaft runout directly affects output quality — machine tool spindles, precision grinding heads, and high-speed robotic joints. Standard P0 grade suffices for general power transmission where rotational accuracy is not critical to the process.
Q: What preload should I use when pairing two SU bearings?
A: The SU designation means each bearing is ground for universal pairing, and the L suffix indicates light preload. The correct preload depends on your spindle’s speed-load profile; excessive preload generates heat while insufficient preload allows deflection under cutting forces. We review application parameters to confirm the pairing arrangement suits your duty cycle.
Confirm Your Spindle Specification
Send us the OEM equipment number or full bearing designation from your existing unit, and we will return a verified cross-reference with documentation details within one business day.
