Precision Cylindrical Roller Bearings
Double Row Cylindrical Roller Bearings
High-rigidity bearing solutions for machine tool spindles, rolling mills and precision rotating equipment. TEDIN supplies NN and NNU series double row cylindrical roller bearings with precision grades and bore options for demanding radial support positions.
High-rigidity radial support
Built for spindle, roll neck and high-load shaft positions.
Product Introduction
Product Overview
Double row cylindrical roller bearings are designed for compact radial support positions where high stiffness, accurate running and controlled internal clearance are required.
Technical Focus
Double row roller arrangement for high-rigidity radial support
Compared with single row cylindrical roller bearings, the double row design provides higher radial stiffness within a compact bearing width. It is commonly selected for spindle supports, roll neck positions and precision shaft arrangements.
- Two rows of cylindrical rollers increase radial load capacity and rigidity.
- Tapered bore design allows radial internal clearance adjustment during mounting.
- Precision grades support stable running accuracy in high-speed equipment.
Double Row Rollers
Two roller rows distribute radial load and improve shaft support stiffness.
Tapered Bore 1:12
Used for accurate radial clearance setting through axial displacement on the shaft.
Precision Running
Suitable for applications requiring low runout and stable rotation accuracy.
Spindle & Mill Positions
Commonly used in machine tool spindles, rolling mill stands and heavy-duty rotating shafts.
Bearing Designs
Main Bearing Types
TEDIN supplies NN and NNU series double row cylindrical roller bearings with cylindrical bore and tapered bore options. Select the series according to ring configuration, shaft support position and clearance adjustment requirements.
Tapered Bore Option
Tapered bore versions are used when radial internal clearance needs to be adjusted during bearing mounting.
Selection note
NN and NNU series are selected according to ring rib configuration and support position. For machine tool spindle applications, tapered bore versions are commonly used to control radial internal clearance during installation. Please provide the bearing model, bore type, accuracy grade and clearance requirement when requesting a quote.
Factory Production
Manufacturing Capability for Double Row Cylindrical Roller Bearings
TEDIN manufactures double row cylindrical roller bearings through controlled machining, heat treatment, precision grinding and dimensional inspection processes.
Precision Bearing Manufacturing
Production Control
Process control from raw material to final inspection
For NN and NNU series bearings, machining accuracy, raceway geometry and internal clearance control directly affect radial stiffness and running accuracy. TEDIN focuses on stable production processes for precision and heavy-duty applications.
- CNC turning and raceway preparation for bearing rings.
- Controlled heat treatment to ensure hardness and dimensional stability.
- Precision grinding and superfinishing for raceway surface quality.
- Dimensional inspection for bore, outside diameter, width and runout.
CNC
Ring Machining
Controlled turning process for inner and outer ring dimensions.
HT
Heat Treatment
Hardness and stability control for bearing steel components.
GR
Precision Grinding
Raceway and bore grinding for accuracy and surface finish.
QC
Final Inspection
Dimensional, clearance and running accuracy checks before delivery.
Quality Documents
Available Inspection Reports
Inspection documents can be provided according to project requirements and bearing application conditions.
Selection Guide
Speed & Load Based Selection Guide
Select bearing design, precision grade, cage and clearance according to speed, radial load and operating temperature.
01
High Speed
Use P4 / P2 accuracy, stable cage and proper lubrication. Check limiting speed before selection.
02
Heavy Load
Prefer NNU series for higher radial stiffness. Brass cage and C3 clearance may be considered.
03
High Accuracy
Use P4 / P2 grade. K tapered bore helps adjust clearance during precision mounting.
04
Temperature Rise
Avoid too small clearance. C3 may be required with tight fit or thermal expansion.
05
Shock Load
Brass cage and stable fitting are preferred for vibration, impact load or heavy-duty running.
Need bearing selection support?
Send speed, radial load, shaft fit, temperature and bearing position for technical confirmation.
Applications
Where Double Row CRB Works Best
Best suited for shaft positions requiring high radial rigidity, accurate rotation and compact bearing arrangement under heavy radial load.
01
Machine Tool Spindle Support
Used for precision spindle positions where radial rigidity, controlled clearance and runout accuracy are critical.
02
Rolling Mill Roll Neck
Used for work roll or backup roll support where radial load is concentrated in limited mounting space.
03
Precision Roller Support
Used in printing, paper and coating rollers where stable rotation and clearance control affect product quality.
04
Gearbox High-Load Shaft
Used on intermediate or output shafts where gear forces create high radial load and vibration.
05
Industrial Spindle / Rotary Table
Used for precision rotary shafts requiring rigid radial support, while axial load is handled by separate bearings.
06
Check Before Use
Double row cylindrical roller bearings mainly carry radial load. For dominant axial load, use additional thrust or angular contact bearings.
Need confirmation for your shaft position?
Send bearing position, load direction, speed, shaft fit and required accuracy. Our engineer will check the suitable NN / NNU design.
Inquiry Checklist
What to Provide for Fast Quotation
A complete bearing request helps us confirm the suitable NN / NNU design, clearance, precision grade and production availability faster.
Send Your Bearing Data
For replacement, please send the existing bearing number or drawing. For new design, provide shaft position, load direction and operating speed.
- Common series: NN, NNU, NN-K, NNU-K
- Optional accuracy: P5, P4, P2
- Typical use: machine tool spindles, roll necks and high-load shafts
Bearing Number
Existing model, equivalent code or previous brand reference.
Dimensions
Bore diameter, outside diameter and width: d × D × B.
Precision Grade
Required accuracy such as P5, P4 or P2.
Clearance
Normal, C3 / C4, or target radial internal clearance.
Bore & Cage
Cylindrical or tapered bore, brass cage or other cage request.
Quantity & Drawing
Order quantity, technical drawing, shaft fit or housing fit if available.
FAQ
Frequently Asked Questions
Common questions about double row cylindrical roller bearing structure, precision, clearance and replacement selection.
Double row cylindrical roller bearings provide higher radial load capacity and higher rigidity than single row designs. They are commonly used in machine tool spindles, rolling mill stands, gearboxes and other shaft positions where compact structure and stable radial support are required.
NN and NNU designs differ mainly in rib arrangement and ring configuration. The selection depends on mounting position, shaft support method, rigidity requirement and whether the bearing needs to allow axial displacement. If an existing bearing code is available, we can check the corresponding structure directly.
Tapered bore double row cylindrical roller bearings are often used where accurate radial clearance adjustment is required. They are commonly mounted on tapered seats or with sleeves, especially in spindle and high-rigidity shaft applications.
P5 is used for general precision equipment. P4 is commonly selected for machine tool spindles and high-speed precision shafts. P2 is used for very high precision positions where strict runout control is required. Final selection should consider speed, rotation accuracy and equipment tolerance requirements.
Internal clearance should be selected according to fit, operating temperature, speed and load. C3 is commonly used where tighter fits or moderate thermal expansion occur. C4 may be required for higher temperature, heavier interference fit or special operating conditions.
Yes. Please provide the existing bearing code, drawing or key dimensions. We can compare bore diameter, outside diameter, width, precision grade, clearance, cage type and bore structure before confirming a replacement option.
To quote accurately, please provide the following information:
- Bearing code or drawing
- Inner diameter, outer diameter and width
- Precision grade and internal clearance
- Cylindrical bore or tapered bore
- Cage material and quantity
- Application position or working condition
Request Technical Review
Need Help Selecting a Double Row Cylindrical Roller Bearing?
Send us your existing bearing number, drawing, key dimensions or application conditions. TEDIN can help review structure type, precision grade, internal clearance and replacement feasibility for double row cylindrical roller bearings.
WhatsApp: 8613663889399 Tel: +86 13663889399 Email: in**@***********gs.com
NN, NNU and custom bearing structures, tapered bore options, high precision grades and replacement model review are welcome.