Do you provide inspection certificates and do OEM?

Yes. Every shipment can include a Certificate of Conformity (COC); matched sets include preload verification data. Detailed dimensional reports and material certificates (EN 10204 3.1 / 3.2) available for a fee. For OEM, we can laser-mark your brand and part number and use custom packaging - all covered by a confidentiality agreement.

7212 P2 Ultra-Precision Bearings for Medical Imaging Equipment

Name: 7212 P2 Ultra-Precision Bearings for Medical Imaging Equipment
Brand: Luoyang Rock Precision Engineering Co., Ltd.
SKU: 2143761852

Henan, ChinaLuoyang Rock Precision Engineering Co., Ltd.

US$1.00

1 Piece

Sample price:US$100.00/piece.Request sample

Product profile

Customization

Available

Rolling Body

Roller Bearings

The Number of Rows

Single

Model NO.

72 Series

Outer Dimension

Multiple Sizes Available

Material

Chrome Steel

Spherical

Aligning Bearings

Load Direction

Radial & Axial Bearings

Separated

Transport Package

Stardard

Specification

Stardard

Trademark

Rock

Origin

Luoyang

HS Code

8482500090

Production Capacity

5000 Pieces/Year

Key features

Ultra-High Precision Grades: Available in P2, P4, and P5 precision grades per ISO 492 standards for critical applications.

Higher Load Capacity Design: Medium cross-section offers significantly higher radial and axial load ratings than 70 series.

Low Noise and Vibration: Super-finished raceways and graded balls ensure noise below 45 dB for smooth operation.

Hybrid Ceramic Option: Si3N4 ceramic balls available for 30% higher speed limits and electrical insulation.

Factory Direct Manufacturing: In-house production from forging to assembly ensures full process control and traceability.

Universal Matched Sets: Pre-matched DB/DF/DT pairs with controlled preload for direct mounting and interchangeability.

Comprehensive Quality Control: 100% inspection for runout, dimensions, and noise; ISO 9001 certified with full traceability.

Company profile

High Repeat Buyers ChoiceIn-stock CapacityFast DeliveryCustomization from Samples

Luoyang Rock Precision Engineering Co., Ltd.

Henan, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 1 year CertifiedNearest Port: Qingdao PortAverage Response Time: ≤1.88h

AI-Powered supplier vetting

SummaryLuoyang Rock Precision Engineering Co., Ltd. is a China-based limited company established in 2022 with 19 employees. Its stated product scope includes bearings, machine tools, robots, and port machinery, and its products are reportedly used in construction machinery, mining equipment, CNC machine tools, wind power, robotics, and heavy industry. The supplier reports flexible customization and OEM service for well-known brands, but no SDK availability. Manufacturing resources include one production line and two export-trade staff, with one experienced export employee. Service-control weaknesses are documented: no written procedures or records for supplier-service assessment, corrective and preventive actions, or complaint handling. Finished products are checked by packing staff, and continuous quantity reconciliation is not performed for each batch. Overseas warehouse, showroom, agent/branch, and offline trade-show capabilities are absent. Certification holdings, verified customer cases, and sufficient...

After-Sales capabilityFinished products are checked by packing staff, but the supplier has no written procedures or records for effective service-capability assessment, corrective and preventive actions, or customer-complaint handling. It also has no overseas warehouse, showroom, agent or branch, and has not participated in offline trade shows, indicating limited documented and overseas service infrastructure.

R&D capabilityThe company describes 20 years of continuous innovation and modern precision technology, and its products are used in technically demanding sectors including CNC machine tools, wind power, robotics, and heavy industry. However, it explicitly reports no available SDK, so software-development integration capability is not demonstrated.

Production capacityThe supplier reports one manufacturing production line and one year of export experience, supported by two export-trade staff and one experienced export employee. It does not perform continuous quantity reconciliation for every batch or mass-production run, which is a stated production-control weakness.

Customization capabilityThe supplier explicitly reports customization from samples, designs, full customization, minor customization, and flexible customization. It also states that it provides OEM services for well-known brands, supporting a positive assessment of customization capability.

Product Q&A

Q:What is the difference between 70 series and 72 series?

Both are angular contact ball bearings, but the 72 series has a medium cross-section (larger OD and width for the same bore), giving significantly higher radial and axial load capacity. The 70 series (light cross-section) has higher limiting speed. Choose 72 series when load capacity is critical (heavy-duty spindles, gearboxes, pumps); choose 70 series for ultra-high-speed, light-load applications.

Q:What does 'universal matched' mean?

Universal matched bearings (suffix UL or UO) are ground to very tight width tolerances so any two from the same batch can be paired in any arrangement (DB, DF, or DT) without further adjustment. We offer light preload (UL) and zero clearance (UO) universal sets.

Q:Should I choose all-steel or hybrid ceramic bearings?

Choose hybrid ceramic (Si3N4 balls) when operating speed exceeds 70-80% of the all-steel limiting speed, electrical insulation is needed (motor/generator), or grease life is a concern due to high heat. Choose all-steel when cost is primary, shock loads are significant (ceramic can fracture under heavy shock), or speeds are moderate.

Q:How do I select the right preload?

Light preload (Class A / UL) for ultra-high-speed finishing and grinding where heat is the main concern. Medium (Class B) balances speed and stiffness for general milling. Heavy (Class C) maximizes rigidity for heavy-duty roughing but reduces limiting speed. When in doubt, start with light or medium - excessive preload is a common cause of premature failure.

Q:What lubrication do you recommend for high-speed spindles?

For maximum speed, oil-air or oil-mist lubrication is best - it delivers precise oil to the contact zone while compressed air cools the bearing. Bearings with W33 (oil groove + 3 holes) are designed for this. For moderate speeds, high-speed spindle grease (lithium complex or polyurea) works well. Always follow your machine builder's specification.