Rolling Mill Bearing Series
Four Row Cylindrical Roller Bearings
Heavy-duty radial bearings for rolling mill roll necks. Four row cylindrical roller bearings are used in high-load mill positions where radial capacity, separable mounting and reliable roll support are required.
- Rolling Mill Roll Necks
- High Radial Load
- Separable Design
- Custom Large Sizes
Roll Neck Radial Support
Built for work rolls, backup rolls and heavy mill stand positions.
Product Overview
Built for Rolling Mill Radial Support
Four row cylindrical roller bearings are mainly used in mill roll neck positions where radial load, compact bearing space and repeated maintenance are key factors.
Bearing Function
Radial support for roll neck arrangements
The four-row roller layout increases radial carrying capacity while keeping the bearing suitable for roll neck mounting and replacement work.
- Used in work roll and backup roll positions
- Suitable for heavy rolling force transmission
- Designed for mill stands with limited radial space
- TIMKEN, FAG, NSK, SKF references checked by drawing or model
Four-row roller layout
Multiple roller rows distribute radial load across a wider contact area.
Separable components
Rings can be separated to simplify mounting, inspection and replacement.
Mill-duty structure
Structure can be matched with roll neck design, housing space and lubrication layout.
Cross-reference supply
Original bearing references can be reviewed by drawing, dimensions or model number.
Main Designs
Common Four Row Cylindrical Roller Bearing Designs
FC, FCD and FCDP designs are commonly used for rolling mill roll neck applications. The final structure depends on bearing size, mounting method and contamination conditions.
FC
Two outer rings with one inner ring
FC type is a common open design for roll neck radial support where compact bearing space and high radial load are required.
- Outer ring Two-piece outer ring
- Inner ring One-piece inner ring
- Type Open structure
- Use Work roll / backup roll necks
FCD
Split outer rings and split inner rings
FCD type uses separable ring components to simplify mounting, inspection and replacement in large rolling mill bearing positions.
- Outer ring Two-piece outer ring
- Inner ring Two-piece inner ring
- Type Separable open structure
- Use Heavy-duty roll neck support
FCDP
Sealed design for contaminated mill positions
FCDP type is used where water, scale or contaminants need to be controlled around the bearing arrangement.
- Outer ring Split outer ring arrangement
- Inner ring Split inner ring arrangement
- Type Sealed structure
- Use Wet or contaminated mill stands
Typical Mill Positions
Four row cylindrical roller bearings are mainly selected by roll position, bearing envelope and mounting conditions in the mill stand.
Work roll necks
Used in work roll positions where roll changes, dimensional checks and lubrication condition are frequent maintenance concerns.
Backup roll necks
Applied in larger bearing positions where housing fit, shoulder radius and bearing envelope need careful confirmation.
Intermediate roll necks
Used in selected multi-roll mill positions where bearing envelope and mounting sequence must match the stand design.
Edger and vertical roll positions
Used in vertical roll arrangements where radial support, mounting space and sealing condition should be checked together.
Common equipment
- Hot strip mills and cold rolling mills
- Plate mills, bar mills and wire rod mills
- Section mills and universal rolling stands
- Edger mills, vertical stands and finishing stands
Information usually required
For replacement projects, bearing model, main dimensions, roll neck drawing, housing drawing, lubrication method and operating position help confirm the correct bearing design.
Quality Control for Four Row Cylindrical Roller Bearings
Tedin controls key production and inspection steps for four row cylindrical roller bearings used in rolling mill roll neck applications, including material review, heat treatment, raceway grinding, roller matching and final clearance inspection.
Raw material inspection, heat treatment inspection, roller profile, roller sorting and key dimensions are controlled as priority checks during production.
Inspection Before Delivery
Each bearing can be checked according to drawing requirements, replacement dimensions and operating position. For rolling mill applications, attention is given to ring accuracy, raceway condition, roller grouping, radial clearance and lubrication details.
Ring and Raceway Inspection
Bore, outside diameter, width, chamfer, raceway profile and key fitting surfaces are checked against confirmed drawings or specifications.
Radial Clearance Check
Internal radial clearance is reviewed according to bearing design, fit conditions and customer requirements.
Marking and Packing Review
Bearing marking, anti-rust protection, packaging method and order information are confirmed before shipment.
Material Check
Bearing steel, forgings and related components are reviewed before processing to support stable performance under heavy radial load.
Heat Treatment
Hardness, hardened layer, microstructure and dimensional stability are controlled according to process requirements.
Raceway Grinding
Raceways, ribs, end faces and fitting surfaces are ground and checked to support accurate load distribution.
Roller Sorting
Roller diameter grouping and sorting are checked to support consistent load sharing in four-row designs.
Available Inspection Reports
Inspection documents can be provided according to project requirements and bearing application conditions.
Ordering Information for Four Row Cylindrical Roller Bearings
For quotation, please send the bearing code, drawing, main dimensions or old bearing photos. We will confirm the supply basis before production.
Bearing Code
Existing model number or old bearing marking.
Main Dimensions
Bore diameter, outside diameter and total width.
Drawing or Photo
Bearing drawing, nameplate photo or sample photo.
Precision Request
Required precision class or tolerance request.
Quantity
Trial order, spare parts quantity or annual demand.
Delivery Time
Required delivery schedule or project timeline.
Send model number, drawing or photos for quotation.
Four Row Cylindrical Roller Bearings FAQ
Common questions about four row cylindrical roller bearings for rolling mills, roll neck applications and replacement supply.
What are four row cylindrical roller bearings used for?
Four row cylindrical roller bearings are mainly used for rolling mill roll necks and other heavy radial load positions. They are designed for high radial load capacity, compact bearing arrangements and stable operation in demanding metal processing equipment.
What is the difference between FC, FCD and FCDP designs?
FC, FCD and FCDP are common design groups for four row cylindrical roller bearings. The differences are mainly related to ring structure, separable components, cage arrangement and mounting requirements. Selection is usually based on the original bearing number, roll neck drawing or equipment position.
Can Tedin replace SKF, FAG, NSK or other bearing numbers?
Yes. Tedin can support cross-reference supply for many international bearing numbers. Please send the existing bearing code, brand, drawing or photos of the old bearing markings. Our team will check dimensions, internal design and application conditions before quotation.
What information is needed for quotation?
For faster quotation, please provide the bearing model number, bore diameter, outside diameter, total width, quantity and required delivery time. If available, a drawing, old bearing photo or roll neck data will help confirm the correct four row cylindrical roller bearing design.
Can you manufacture according to drawings or samples?
Yes. Four row cylindrical roller bearings can be supplied according to standard bearing numbers, customer drawings or sample bearings. For non-standard roll neck bearings, we usually confirm dimensions, clearance, cage type, material and heat treatment requirements before production.
What inspection reports can be provided?
Available documents may include raw material certificate, heat treatment report, dimensional inspection report, hardness report, grinding inspection record, roller sorting record and final inspection report. Third-party inspection can also be discussed before order confirmation.
Are four row cylindrical roller bearings suitable for axial load?
Four row cylindrical roller bearings are mainly designed for radial load. In rolling mill applications, axial load is usually supported by separate thrust bearings or other locating bearing arrangements. The final selection should follow the mill stand design and load direction.
What is the typical delivery time?
Delivery time depends on bearing size, quantity, material status and production schedule. Standard or repeat models may have shorter lead times. Large-size or non-standard rolling mill bearings should be confirmed based on drawing and technical requirements.
Have a bearing number or old bearing photo?
Send the model number, drawing or roll neck data to confirm the correct bearing design. Contact Tedin for technical support →
Need Help Confirming a Four Row Cylindrical Roller Bearing?
Send us your bearing number, drawing, old bearing photos or roll neck data. TEDIN can help review structure type, dimensions, clearance, cage design and replacement feasibility for four row cylindrical roller bearings.
- Existing Bearing Model
- Drawing or Key Dimensions
- FC / FCD / FCDP Design
- Roll Neck Application
FC, FCD, FCDP and custom rolling mill bearing structures, cross-reference replacement and inspection document requests are welcome.