FC6890250 Rolling Mill Bearing

SUN Bearing’s four-row cylindrical roller bearings are designed for the rigors of daily use in applications where moderate and high speeds, high radial loads, elevated temperatures and debris are constant challenges. Designed with well-balanced cross sections, these bearings provide high-radial-load capacity within the bearing envelope.

The radial internal clearance for the bearing assembly must be included when ordering either a) the complete assembly or b) with the inner-ring set. It is advisable to order the inner-ring set independent of the outer ring set when the final grind of the inner-ring O.D. is accomplished after mounting on the roll neck.

The bearing style incorporates two outer races with triple flanges (solid ribs). The inner race is usually single-piece construction. The outer assemblies consist of the outer race, rollers and cages, which create a unitized construction. Handling is made simple by this design. A loading slot is used for roller insertion. Lubrication is generally accomplished via slots in the faces of the outer ring. The cage is single-piece, fully machined brass or steel material. The roller pockets are staggered between the races.

• Two outer rings with integral ribs.
• Two inner rings.
• With lubrication grooves and holes on outer rings.
• Without lubrication grooves and holes on outer rings.
• Two solid-steel or brass cages.

Product picture&2D Drawing of FC6890250 Four-Row Cylindrical Roller Bearing

Engineered primarily for rolling mill roll-neck applications,SUN Bearing’s four-row cylindrical bearings are commonly used in work roll or back-up roll positions in flat product, long productand structural mills.

 1.Product Features

• Available in sizes 140 mm I.D. – 2000 mm 
• Case-hardened rings and rollers enhance durability.
• Inner races are interchangeable with outer assemblies.
• Manufactured to P6 boundary and P5 run out tolerances.
• Roller profiles are custom designed and manufactured for optimum performance.
• Straight and tapered bores are available.

2.Radial Internal Clearance

SUN Bearing's standard bearings offer different clearances, such as C3 or C4 according. If needed for your application,they can be furnished with a tapered bore.

Supply inner rings in two ways: a finished state with no additional grinding required or a semi-finished condition with appropriate grind stock. Semi-finished inner rings allow mill operators to optimize the roll’s precision by finish grinding the inner ring after mounting it onto the roll.

3.Lubrication

SUN Bearing's four-row cylindrical roller bearings can be used with grease, oil-air, oil-mist or circulating-oil systems. The bearings must be correctly lubricated for maximum performance through either lubrication grooves, holes in the outer-ring or through integrated face slots on the outer-ring faces.

4.Material

Our bearings are designed to provide superior size stability,fracture toughness and reliability. By using only high quality,carburized alloy, and applying a special heat-treatment duringthe manufacturing process, we are able to produce bearings that can withstand the heavy stresses and impact loading often experienced by multi-row cylindrical roller bearings used in rolling mills.

5.Mounting design and fitting prctice

The cylindrical roller bearing design accommodates radial loading only, therefore, a separate thrust bearing must be usedto provide axial shaft location.

The housing fitting practice usually results in a loose fit to facilitate easy removal at regular maintenance intervals. The preferred shaft fit is tight. There are occasions where loose shaft fits are tolerated, such as on some roughing-mill equipment. In the cases where a shaft fit is loose, inner-race bore lubrication grooves must be incorporated in the bearing.

Inner rings can be ordered separately from the outer assembly in order to equip additional spare rolls. Inner- and outerring assemblies are interchangeable in regard to internalclearance.

Quality control of SUN Bearing for all bearing series

• Assembly
• Windage test
• Cleaning
• Rotary test
• Greasing and gland
• Noise inspection
• Apprearance inspection
• Rust prevention
• Product packing

Processing

Each bearing is 100% inspection by qualified inspectors and instruments in all above processes.

A. Package instuctions of SUN Bearing for all bearing series.

• Commercial packaging: 1pc/plastic bag + color box + carton + pallet
• Industrial packaging: a). plastic tube + carton + pallet; b). plastic bag + kraft paper + carton + pallet
• Customized packaging solutions according to customers' requirements
• High quality rubber cover: waterproof, wear-resisting, high temperature resistance,corrosion resistance

B. Shipping

• By courier like EMS, DHL, UPS, TNT, Fedex
• By air to air port
• By sea to sea port
• Select the best shipment mode after customers' confirmation  through negotiations between us
• Generally it is 3-15days if the goods are in stock. Or it is 10-45days if the goods are not in stock, it is subject to customers' quantity.

SUN Bearing's payment terms for all bearing series.

• Preferred on line payment is through the trade assurance order of Alibaba,which guarantees the buyers to get compensation for free when suppliers default happens even though the suppliers refuse to handle disputes.
• Other payment modes are available including Paypal,T/T,Western Union,L/C etc.
• Confirm the payment terms by negotiation with our clients on the basis of mutual benefit.

Assure to inform customer the receipt of customers' payment at once.Then we will arrange the delivery ASAP.

• SUN Bearing can provider OEM or ODM service according to samples or drawings offered by customers.
• Lead time is usually 15-45days.
• Confirm the specifications of the customized bearing through researching application lines, environment&conditions,matched equipments specifications,etc.
• Assure the customized bearing complied with clients' requiements to give our customer the most stable use effect of the beairng.

SUN Bearing's sample instructions for all bearing series.

• The bearing value below 80USD is for free.
• Customers only need to pay the freight in advance. We will send samples within 7days by (DHL, FedEx, TNT, EMS).
• As we have so many customers asking for samples all over the world,we can’t pay for the express charges for every customer.
• Pay back the express charges to our customers when customers engage a trial order.

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Feel free to contact me when you need any information about bearings,contact details as following:

click here to contact  

Michael Li

International bussiness manager

Tel/Fax:+86-411-88700549

Whatsapp/Mob.:+8615942892735

WeChat:xuelumuye

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