What are the standard insulation voltage classes?

Standard insulation covers 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.

Nu322 C3 High-Load Insulated Roller Bearing for Wind Power Generators

Name: Nu322 C3 High-Load Insulated Roller Bearing for Wind Power Generators
Brand: Luoyang Rock Precision Engineering Co., Ltd.
SKU: 2174800382

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 barrier blocks shaft current to prevent pitting, fluting, and premature bearing failure.

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

Direct Replacement Capability: Can replace standard non-insulated NU bearings without changing basic envelope dimensions.

High Radial Load Capacity: Single-row NU design supports high radial loads with axial displacement for free-end positions.

Multiple Insulation Configurations: Available with outer-ring, inner-ring, or enhanced ceramic coating for specific voltage needs.

Wide Voltage Range Options: Design targets up to 1,000V, 2,000V, and 3,000V DC depending on coating selection.

Customization Services: OEM and ODM services available including customization from samples and designs.

Flexible Clearance Options: CN, C3, or C4 radial clearances available subject to model availability and engineering confirmation.

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: ≤1.40h

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 NU bearing base model, quantity, insulation position, operating voltage, minimum electrical resistance, radial clearance, cage material, motor speed, radial load, operating temperature, shaft and housing fits, lubrication method, and service environment.