Cylindrical Roller Bearing
ISO 9001 Certified
TS 16949
Genuine SKF
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Cylindrical Roller Bearing
NTN NJ340EM/NU340EM/NJ344EM/NU344EM Cylindrical Roller Bearings – High-Precision, Heavy-Duty
Product Specifications
| Bore Diameter | Outer Diameter | Width |
|---|---|---|
| 15–90 mm | 35–180 mm | 80 mm |
Introduction
NJ340EM is a high-precision cylindrical roller bearing made of bearing steel, designed for radial load applications. It features non-aligning structure, separated design, and supports grease or oil lubrication. Available in precision grades P0–P2 and vibration classes Z1V1–Z3V3. Ideal for OEM/ODM industrial use.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
NTN NJ340EM / NU340EM / NJ344EM / NU344EM Cylindrical Roller Bearings – High-Precision, Japan-Made Performance
| Description | Key Selling Point |
|---|---|
| NJ340EM, NU340EM, NJ344EM, NU344EM — optimized for heavy radial loads & high-speed operation | |
| Material & Precision | High-carbon chromium bearing steel (SUJ2), P0–P2 precision grades — ISO 9001 & JIS B 1514 certified |
| Dimension Range | Bore: 15–90 mm; OD: 35–180 mm; Spec: 200×420×80 mm — ideal for industrial gearboxes & motors |
| Load & Structure | Radial-only, cylindrical roller design with separable rings — enables easy mounting & maintenance |
| Lubrication Flexibility | Compatible with premium grease or oil — extended service life in continuous-duty applications |
| Vibration Control | Z1V1–Z3V3 low-noise grading — meets strict OEM requirements for quiet, stable rotation |
| Origin & Reliability | Manufactured in Japan — superior heat treatment & grinding consistency vs. generic alternatives |
| OEM/ODM Support | Full customization available: cages, clearances, surface treatments, packaging — backed by NTN’s global warranty |
| Application Scope | Wind turbines, mining conveyors, paper mills, steel rolling mills, and marine propulsion systems |
| Why Choose NTN Over Others? | Higher dynamic load rating (+12% avg vs. standard P0), tighter dimensional tolerances, and proven fatigue life in harsh environments |
FAQ: Are these bearings interchangeable with SKF NUP/NJ series? Yes — dimensions & load ratings align closely; NTN offers better thermal stability under sustained 150°C+ operation. Do they support axial displacement? NJ-type retains axial location on one side; NU-type is fully floating — confirm shaft/housing fit per application. What cage options exist? Brass, polyamide, and pressed steel — selected based on speed & temperature profile.
Ready to specify the right NTN cylindrical roller bearing for your project? Send your inquiry now — our technical team replies within 2 business hours with CAD data, compatibility reports, and volume pricing.
Product Summary
- Product Name
- NTN NJ340EM/NU340EM/NJ344EM/NU344EM Cylindrical Roller Bearings – High-Precision, Heavy-Duty
- 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
NTN NJ340EM/NU340EM/NJ344EM/NU344EM Cylindrical Roller Bearings – High-Precision, Heavy-Duty
NDA protected · Free samples for orders > $50K · Reply within 12 hours
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