What are the standard insulation voltage classes?

Standard insulation supports up to 1,000 V DC, enhanced insulation up to 2,000 V DC, and high-voltage insulation up to 3,000 V DC. Final coating voltage and resistance must be confirmed in the quotation.

What are the main applications for this bearing?

Suitable for AC and DC electric motors, variable-frequency drive motors, industrial generators, wind-power generators, railway traction motors, pumps, compressors, fans, mining systems, and machine tools.

Nu218 C3 Heavy-Duty Ceramic-Coated Bearing for Industrial Motors

Name: Nu218 C3 Heavy-Duty Ceramic-Coated Bearing for Industrial Motors
Brand: Luoyang Rock Precision Engineering Co., Ltd.
SKU: 2179794992

Henan, ChinaLuoyang Rock Precision Engineering Co., Ltd.

US$1.00

1 Piece

Sample price:US$10.00/piece.Request sample

Product profile

Customization

Available

Rolling Body

Roller Bearings

The Number of Rows

Single

Model NO.

NU Series

Outer Dimension

Medium and Large(120-190mm)

Material

Bearing Steel with Aluminum Oxide Ceramic Insulati

Spherical

Non-Aligning Bearings

Load Direction

Radial Bearing

Separated

Transport Package

Individual Box + Export Carton + Plywood Case

Specification

Stardard

Trademark

Rock

Origin

Luoyang

HS Code

8413910000

Production Capacity

5000 Pieces/Year

Key features

Electrical Insulation Protection: Ceramic coating blocks shaft current to prevent erosion and premature bearing failure.

Extended Maintenance Intervals: Reduces vibration and noise while protecting lubricant from electrical discharge degradation.

Standard Dimension Compatibility: Retains nominal envelope dimensions of standard NU bearings for easy replacement.

Multiple Voltage Options: Available for 1,000V, 2,000V, and 3,000V DC applications with plasma-sprayed coating.

Flexible Insulation Configurations: Offers outer-ring or inner-ring insulation based on specific isolation needs.

Customization Services: Full customization, minor customization, and design-based options available.

OEM and ODM Support: Manufacturer offers OEM and ODM services with flexible customization capabilities.

Diverse Cage Materials: Options include pressed steel, machined brass, or engineering polymer cages.

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: ≤2.28h

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:Does the ceramic coating change the bearing dimensions?

The insulation layer is engineered so the finished bearing retains the nominal envelope dimensions of the corresponding standard NU bearing. Final tolerances must be confirmed for the selected coating and fit.

Q:Should I choose outer-ring or inner-ring insulation?

Outer-ring insulation is commonly selected for housing-side isolation. Inner-ring insulation may be preferred for shaft-side isolation or when lower capacitance is required. The current path and mounting arrangement should be reviewed.

Q:Can an NU bearing carry axial load?

The NU design is primarily a radial, non-locating bearing. It permits axial displacement in both directions and normally requires a separate locating bearing elsewhere in the arrangement.

Q:Can C3 or C4 clearance be supplied?

Yes, subject to model availability and engineering confirmation. Motor temperature, interference fits and operating speed should be considered before selecting clearance.

Q:What information is required for a quotation?

Required details include the NU bearing base model, quantity, insulation position, operating voltage, minimum electrical resistance, radial clearance, preferred cage material, motor speed, radial load, operating temperature, shaft and housing fits, lubrication method, service environment, and any required test reports.