NSK 7200ATYNSUHP4 Angular Contact Ball Bearing P4 Precision

Description

Traceable Authenticity — Every NSK 7200ATYNSUHP4 we supply ships with batch-level traceability linking back to the authorized distribution channel, verified through manufacturer QR systems before it reaches your spindle assembly bench.

Technical Specifications

Note: The suffix "H" within TYNSUHP4 falls outside standard NSK published suffix conventions and should be confirmed against the manufacturer’s current catalog or factory documentation prior to final specification lock-in.

Application Suitability

Why Spindle Shops Overlook the Suffix String on the NSK 7200ATYNSUHP4 Angular Contact Ball Bearing

The base number 7200 tells you the bore and the series. Everything after it tells you whether the spindle will survive first shift.

Walking through machine shops in Dubai and Riyadh, I kept seeing the same pattern: purchasing teams matched the bore, OD, and width, then stopped reading. A customer in Jeddah sourced what they thought was an equivalent 7208 angular contact for a CNC grinding spindle. The dimensions were identical. What they missed was the precision class drop — from P4 to P0 — and a missing matched-pair spec. Within a week the spindle ran hot, vibration readings climbed, and surface finish on the workpieces was rejected. The shop blamed the bearing. The real failure was in the suffix line on the purchase order. [NEED_CITE: angular contact bearing suffix impact on spindle performance and thermal behavior]

Matching the NSK 7200ATYNSUHP4 to High-Speed Spindle Duty

This bearing sits in the 10 mm bore segment common in small high-speed grinding spindles and precision instrument drives. The 25° contact angle balances radial support with axial thrust capacity — critical when the spindle sees combined loading from grinding wheel contact forces and belt or motor drive preload. The polyamide cage reduces rotating mass and keeps friction heat low at the speeds these small spindles demand. When I cross-reference this against competing requests — say a buyer asking for an FAG 7200A-P4s-UL — I verify not just the base dimensions but the cage type, the precision tier, and the flush-grinding arrangement, because mismatching any one of those three will show up as runout on the finished part.

Thermal Growth and Lubrication Reality in Small-Bore Spindles

A 10 mm bore spindle running at elevated RPM generates heat fast, and there is very little thermal mass to absorb it. The 25° contact angle on the NSK 7200ATYNSUHP4 angular contact ball bearing introduces a predictable axial stiffness, but it also means the inner and outer rings must be controlled for thermal expansion or the preload will shift mid-run. Oil-air or oil-mist lubrication is typical here; grease-packed setups in this size often starve at high speed and cause cage wear. Clean, dry mounting is non-negotiable — any contamination trapped during press-fit will read as vibration noise within the first hour of operation. [NEED_CITE: lubrication starvation in high-speed small-bore angular contact bearings]

Decoding What the Suffixes Actually Control

A — 25° Contact Angle. This determines the ratio of axial to radial load capacity. A 15° angle would give higher radial stiffness but less thrust capability; 40° would do the opposite. The 25° choice is the standard compromise for general spindle work where the grinding or cutting forces have both radial and face-direction components.

TYN — Polyamide Cage, Inner Ring Centered. Polyamide cages run cooler and quieter than machined brass at high speed because they weigh less and generate lower centrifugal forces on the rolling elements. The inner-ring-centered design keeps the cage stable when the inner ring rotates at spindle speed, preventing cage whirl.

P4 — ISO 492 Class 4 Precision. This tolerance band controls bore, OD, width variation, and running accuracy to levels required for spindle applications where workpiece surface finish is measured in microns. A drop to P6 or P0 introduces runout that manifests as chatter marks on ground or milled surfaces.

SU — Single Universal Flush. The bearing is ground so that its faces are flush when mounted individually, allowing it to be paired in DB, DF, or DT arrangements at the spindle builder’s discretion with predictable preload results.

What a Wrong Specification Really Costs a Spindle Rebuild

A spindle cartridge rebuild is not a cheap exercise — the labor to disassemble, clean, re-balance, and test-run the unit often exceeds the bearing cost several times over. Drop in a bearing with incorrect precision, wrong contact angle, or a mismatched cage and the spindle comes back apart within weeks. The failure modes are well documented: premature cage wear from lubrication incompatibility, thermal seizure from incorrect preload, surface spalling from tolerance stacking errors. ISO 15243 classifies these as distinct failure categories, and each one traces back to a specification that was either ignored or assumed equivalent. [NEED_CITE: ISO 15243 bearing failure mode classification and root cause categories]

How We Verify What Ships

Every NSK 7200ATYNSUHP4 angular contact ball bearing we handle is sourced through authorized distribution channels, and the chain of custody is documented at the batch level. We cross-reference requests against our interchange database — checking not just bore, OD, and width but the full suffix string for cage material, precision class, contact angle, and arrangement type. When a buyer sends an OEM equipment number instead of a bearing designation, we trace back to the original specification and confirm whether the precision class and preload arrangement match what the spindle builder intended. Authenticity verification runs through the manufacturer’s official QR pathway so you can confirm the same thing on your phone at the receiving dock. Country-of-origin documentation and HS code support travel with the shipment to smooth customs clearance on your end.

Documentation & Authenticity

• Supplier Certificate of Conformity referencing the specific batch and lot number of the NSK 7200ATYNSUHP4 shipped
• Dimensional inspection report confirming P4 running accuracy and bore/OD tolerances per ISO 492 before dispatch
• Material certificate covering the bearing steel grade and heat treatment condition for traceability
• QR code verification pathway via NSK official application for authenticity confirmation at receiving
• Country-of-origin documentation and HS code classification support for import customs filing

Storage, Handling & Mounting

• Keep the 7200ATYNSUHP4 in its original sealed packaging until the moment of spindle assembly — polyamide cages absorb moisture if exposed to humid shop air, which affects dimensional stability at P4 precision
• Store flat in a temperature-stable environment away from direct sunlight to prevent polyamide cage material degradation over extended shelf periods
• Use lint-free gloves when handling the separated bearing components; fingerprint acids on the 10 mm bore or raceways will initiate corrosion that shows up as surface noise on the spindle test bench
• Mount with controlled press-fit on the shaft using an induction heater set to the manufacturer’s recommended temperature — cold pressing risks brinelling the raceway on this small-bore P4 bearing
• For SU arrangement pairing, verify the flush-ground face marks align before applying clamping preload, and confirm axial play matches the spindle builder’s specification after assembly
• Open-type bearing requires external lubrication routing to be confirmed clean and flowing before spindle startup; do not assume residual factory oil is sufficient for high-speed run-in

Getting the Specification Right Before You Order

Share your spindle speed, load profile, and lubrication method so we can confirm the 25° contact angle and polyamide cage are the correct match for your duty cycle. If you are working from an OEM equipment number or a competitor designation like FAG 7200A-P4s-UL, send it over and we will run the full cross-reference including precision, cage, and arrangement alignment. Request the documentation package and origin confirmation up front so your import paperwork is settled before the shipment moves. Batch availability and lead time will be confirmed against your required quantity once the spec is locked.

Frequently Asked Questions

Q: Can I substitute a 15° contact angle bearing in place of the 25° A-suffix on the 7200ATYNSUHP4?
A: Not without re-evaluating the spindle’s axial load requirements. A 15° bearing provides higher radial stiffness but significantly lower thrust capacity. If the spindle sees any axial grinding or cutting force, the substitution will lead to premature contact stress on the raceway. The contact angle must match the original spindle design intent.

Q: What does the SU suffix mean for pairing, and can I use this bearing in a back-to-back set?
A: SU designates a single universal flush-ground bearing, meaning the faces are ground to allow predictable preload when paired in DB (back-to-back), DF (face-to-face), or DT (tandem) arrangements. The spindle builder selects the pairing configuration and clamping force based on the stiffness and load requirements of the application.

Q: How do I confirm the P4 precision class is genuine and not re-marked?
A: We supply dimensional inspection data confirming bore, OD, width variation, and running accuracy per ISO 492 Class 4 tolerances. The batch is traceable through the authorized distribution chain, and the bearing’s QR code can be verified through NSK’s official application. Re-marked counterfeits typically fail the running accuracy check when measured on a precision test rig.

Q: Is the polyamide TYN cage suitable for oil-mist lubrication at high speed?
A: Yes. Polyamide cages are well suited to oil-mist and oil-air lubrication systems common in high-speed spindle applications. The cage material is compatible with standard spindle oils and operates with low friction at elevated rotational speeds. Confirm oil cleanliness and flow rate with the spindle builder’s specification.

Q: The suffix "H" appears in TYNSUHP4 — what does it indicate?
A: The "H" element within this suffix string does not correspond to a standard published NSK suffix in common catalog references. We recommend confirming its specific meaning through the manufacturer’s current documentation or by contacting the authorized channel with the full designation and batch number for precise interpretation.

Verify Your Spindle Specification With Us
Send your application parameters or OEM equipment number, and we will confirm the full suffix match, availability, and documentation package for your NSK 7200ATYNSUHP4 angular contact ball bearing requirement.