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Cylindrical Roller Bearing
NSK N305EM/NJ305EM/NF305EM Cylindrical Roller Bearing – High Precision, Low Noise
Basic Info
| Bore Diameter | 15–90 mm |
|---|---|
| Outer Diameter | 35–180 mm |
| Width/Thickness | 25×62×17 mm |
Introduction
Cylindrical roller bearing made of bearing steel, radial load type, non-aligning, separated design. Available in precision grades P0–P2 and vibration classes Z1V1–Z3V3. Suitable for OEM/ODM applications with grease or oil lubrication. Origin: Japan (NSK).7
Day Prototype
vs. 8-12 wks standard
50+
Countries Served
Global logistics network
12h
Quote Response
Expert engineers on call
Typical Applications
Wind Power
Mining
Steel & Metallurgy
Automotive / EV
Rail Transit
Precision Machinery
Genuine SKF Bearings
NDA Protected
Free Sample for Orders > $50K
Global Shipping
Product Details
Key Specifications & Advantages of NSK N305em Series Cylindrical Roller Bearings
| Description | Core Value |
|---|---|
| Precision Grade P0–P2 (ISO) | Ultra-low vibration & extended service life in high-speed applications |
| Bore Size: 15–90 mm / OD: 35–180 mm | Wide interchangeability across industrial machinery & OEM equipment |
| Bearing Steel (SUJ2/GCR15) with heat-treated rollers | Superior hardness (HRC 60–64) and fatigue resistance |
| Radial Load Capacity Only (Non-Self-Aligning) | Optimized rigidity for precision spindles and gearboxes |
| Separated Design (Roller + Cage + Rings) | Easy installation, maintenance & custom assembly |
| Lubrication Flexibility (Grease or Oil) | Adaptable to sealed, high-temp, or circulating oil systems |
| Vibration Grades Z1V1–Z3V3 (JIS B 1514) | Meets strict noise requirements for CNC and medical devices |
| OEM/ODM Support & Full Traceability | Batch-certified documentation & NSK Japan origin guarantee |
| HS Code 8482500090 | Carton/Pallet Packaging | Seamless global customs clearance & logistics readiness |
| Competitive Edge vs. Generic Brands | NSK’s proprietary roller profiling & surface finish reduce friction by up to 22% (vs. standard P0) |
Engineered for demanding radial-load applications — including machine tools, wind turbines, pumps, and automotive transmissions — these cylindrical roller bearings deliver unmatched dimensional stability and thermal performance. Unlike generic alternatives, NSK’s N305em series features micro-ground raceways, optimized internal clearance, and strict vibration control (Z2V2+ certified), ensuring silent, smooth operation even at 8,000 rpm.
FAQ: Are these bearings compatible with SKF mounting dimensions? Yes — ISO-standard N/NJ/NF series share identical boundary dimensions. Do they support heavy shock loads? Optimized cage design and hardened steel enable 15% higher dynamic load rating than baseline ISO specs. Is NSK Japan manufacturing verified? Every batch includes origin certificate and laser-engraved “Made in Japan” mark.
Ready to source genuine NSK cylindrical roller bearings with full technical support and fast lead times? Send your inquiry now — our engineering team responds within 2 business hours.
Product Summary
- Product Name
- NSK N305EM/NJ305EM/NF305EM Cylindrical Roller Bearing – High Precision, Low Noise
- Category
- Cylindrical Roller Bearing
- Brand
- SKF
- Certification
- ISO 9001 · TS 16949
- Lead Time
- 7 Working Days
Get a Custom Quote
Our engineers will respond within 12 hours with a tailored solution.
Request QuoteGeneral Specifications
| Bearing Type | Cylindrical Roller Bearing |
| Brand | SKF |
| Quality Standard | ISO 9001 / TS 16949 |
| Precision Grade | P0 / P5 / P6 (custom) |
| Material | Chrome Steel / Stainless |
| Cage Material | Steel / Brass / Polyamide |
| Lubrication | Grease / Oil (specify) |
| Operating Temp. | -40°C to +200°C |
| Min. Order Qty | 1 pc (samples available) |
| Prototype Lead Time | 7 Working Days |
Performance Parameters
| Load Capacity | Contact for C0/Cr values |
| Speed Rating | Contact for ndm limit |
| Vibration Level | Z1 / Z2 / Z3 (custom) |
| Noise Level | V1 / V2 / V3 (custom) |
| Fatigue Life | L10h per ISO 281 |
| Sealing Options | Open / Z / 2Z / RS / 2RS |
Custom Specifications Available
Our engineering team can modify bearing dimensions, materials, seals, and clearances to meet your specific operating requirements. Submit your drawing or spec sheet for a tailored proposal.
Wind Power
Main shaft bearings, gearbox bearings, and generator bearings for onshore and offshore wind turbines.
Mining & Quarrying
Heavy-duty bearings for crushers, conveyors, and rotary equipment in extreme dust and shock-load environments.
Steel & Metallurgy
High-temperature bearings for rolling mills, continuous casting, and furnace applications.
Automotive / EV
Wheel hub bearings, transmission bearings, and e-motor bearings for passenger and commercial vehicles.
Rail Transit
Axle box bearings, traction motor bearings, and gearbox bearings meeting EN/UIC railway standards.
Precision Machinery
High-precision spindle bearings, angular contact bearings, and super-precision bearings for CNC and robotics.
Application Design
EngineeringOur engineers analyze your operating conditions -- load, speed, temperature, environment -- and select or design the optimal bearing solution to maximize service life and reduce total cost of ownership.
Custom Modification
7-Day TurnaroundNeed non-standard dimensions, special materials, or modified clearances? We can modify standard SKF bearings or manufacture fully custom solutions with a 7-day prototype turnaround.
Failure Analysis
DiagnosticsWhen bearings fail prematurely, our team conducts root-cause analysis using advanced diagnostic tools to identify the failure mode and recommend corrective action.
Predictive Maintenance
Up to 40% Less DowntimeWe deploy vibration monitoring, thermal imaging, and oil analysis programs that detect bearing deterioration early -- reducing unplanned downtime by up to 40%.
On-site Installation
Global CoverageProper installation is critical to bearing performance. Our certified technicians provide on-site installation support, alignment verification, and operator training worldwide.
Lifecycle Support
Enterprise SLAFrom initial selection through end-of-life, our dedicated account managers provide scheduled maintenance plans, re-lubrication programs, and replacement forecasting for enterprise clients.
Why SKF China
The engineering partner advantage
7 Days
Prototype Lead Time
vs. 8-12 weeks via standard channels
15+
Certified Engineers
SKF-certified, on-call for your project
50+
Countries Delivered
Reliable global logistics network
Request a Quote
Get a custom quote for
NSK N305EM/NJ305EM/NF305EM Cylindrical Roller Bearing – High Precision, Low Noise
NDA protected · Free samples for orders > $50K · Reply within 12 hours
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