Precision Screw Down Bearings for Hot and Cold Rolling Mills

What are Screw Down Bearings?

Screw down bearings are specialized,heavy-duty tapered roller thrust bearings designed to handle extremely high axial (thrust) loads in one direction under low operating speeds

Inner and outer rings adopt reinforced integral construction for high deformation resistance.Uniformly distributed cylindrical rollers expand contact area to bear combined radial and axial heavy loads.Available precision grades cover P0,P6 and P5.Inner diameter ranges from 127 mm to 700 mm,outer diameter spans 150 mm to 800 mm,and thickness varies between 48 mm and 270 mm.

Bearing rings and rolling elements adopt GCr15 high-carbon chromium steel or G20Cr2Ni4A alloy carburized steel.Brass or heavy-load composite materials are optional for cages.Standard TTSV and TTSX series can be delivered within 7-15 working days.Customized bearings need direct communication with the manufacturer.

Optimized raceway curve evenly disperses heavy impact loads onto every roller and avoids local stress concentration for frequent shock cycles in rolling production.High-temperature resistant alloy plus special surface hardening guarantees stable performance from minus 40 degree Celsius up to plus 200 degree Celsius,fitting the thermal fluctuation of hot rolling workshops.

The Features of Screw Down Bearings

Extreme Thrust Capacity

Cage-Free Construction:Unlike conventional bearings,screw-down thrust bearings typically feature a full-complement roller design-meaning the cage (retainer) is omitted entirely to maximize internal space.

Maximum Surface Contact:Removing the cage allows for the maximum possible number of rollers packed into the raceway.This provides exceptionally high static and dynamic axial load capacity to resist continuous multi-ton pressing forces without rolling element deformation.

Spherical Self-Aligning Raceways

Concave or Convex Washer Seats:The back face of the upper housing washer or lower shaft ring is precision-ground with a spherical profile.

Deflection Compensation:When rolling forces cause the mill roll or screw-down spindle to flex or tilt slightly,the spherical seat allows angular self-alignment.This prevents uneven edge loading on the rollers and extends bearing service life.

True Rolling Motion via Tapered Rollers

Optimized Contact Geometry:Tapered rollers are arranged so that the projections of the roller surfaces intersect at a common apex on the bearing axis.

Friction & Heat Reduction:This true-rolling action eliminates skidding and sliding friction during slow-speed rotation under immense force,minimizing internal heat build-up and surface scuffing.

Heavy-Duty Case-Carburized Materials

Shock Load Toughness:The rings and rolling elements are typically manufactured from premium case-hardened (carburized) alloy steels.

Durable Hard Shell,Ductile Core:The deep-hardened raceway surface resists wear and fatigue under high pressure,while the softer,ductile inner core absorbs intense impact/shock loads generated during metal entry.

Specialized High-Pressure Lubrication Design

Grease & Oil Channels:Because they operate under slow rotation speeds or back-and-forth oscillating movement,screw-down bearings cannot generate traditional hydrodynamic fluid films on their own.

EP-Additive Reservoirs:The housing features built-in lubrication grooves and passages that ensure continuous distribution of Extreme Pressure greases across all roller-raceway contacts.

The Applications of Screw Down Bearings

Hot Rolling Mills

Equipment:Slabbing mills,blooming mills,roughing stands,and hot strip mills.

Role:Operates under continuous shock loads as glowing-hot metal ingots or slabs enter the mill rolls.The bearing transmits huge vertical tonnage from the screw-down spindle to set the pass line and control initial slab reduction thickness.

Cold Rolling Mills

Equipment:Reversing cold mills,tandem cold mills,and foil rolling stands.

Role:Cold rolling requires significantly higher unit pressure to deform room-temperature metal.Screw-down thrust bearings provide ultra-precise micro-adjustments under static pressure to guarantee strict sheet thickness tolerances.

Plate & Section Mills

Equipment:Heavy plate mills,structural beam mills,and rail rolling stands.

Role:Used in large two-high or four-high mill housings where massive roll deflection occurs.Self-aligning spherical-backed screw-down bearings accommodate the mill stand flex without pinching or premature roller edge damage.

Temper & Skin Pass Mills

Equipment:Finishing line temper stands for sheet steel and aluminum coils.

Role:Skin pass mills apply lighter,highly controlled roll pressure to refine metal surface finish and flatness.Screw-down bearings allow fine,oscillating angular adjustments during continuous high-speed strip processing.

Heavy-Duty Mechanical Screw Jacks & Presses

Equipment:High-tonnage industrial screw jacks,extrusion press adjustment heads,and forging press stop mechanisms.

Role:Applied outside metal rolling in specialized machinery where slow-speed,massive axial thrust needs to be translated linearly via a rotating threaded screw under full load.

Manufacturer of Screw Down Bearings

Newbeetrans is a professional manufacturer supplying precision screw down bearings for hot and cold rolling mills and other heavy-duty metallurgical machinery.Complete production workflow covers independent research and development,precision forging,heat treatment,ultra-precision grinding and dedicated extreme-load performance testing laboratories under ISO 9001 quality management certification.

Stock and Customization Capacity

Mainstream standard TTSV and TTSX series screw down bearing models are kept in stock for prompt shipment.Our technical team delivers comprehensive custom services such as non-standard dimension adjustment,special material upgrade,mounting-hole structural optimization,custom lubrication formula and enhanced sealing configuration.Non-standard heavy-load customization normally takes 6-12 weeks.Urgent production support is available for emergency metallurgy and mining industry projects.

Strict Full-Process Quality Assurance

Each incoming raw-material batch completes spectral and metallurgical inspection.Every finished screw down bearing undergoes one hundred percent inspection including dimension measurement,extreme axial-load simulation assessment,impact-resistance test and surface-quality verification.Material certificates and SGS third-party inspection reports can be provided on client request.

Advanced Production Infrastructure

Special heavy-load thrust bearing grinders,dedicated assembly fixtures and multi-condition extreme-load performance test benches are deployed in-house.MES production management system realizes full-batch traceability to stabilize P0,P6 and P5 precision tolerance standards.

Global Sales and Technical Support

We cooperate with worldwide sea freight and air-freight service providers and support FOB,CIP,DAP and other standard international trade terms.Our engineers provide remote model-selection consultation,installation guidance and lubrication-scheme suggestion for global steel plants and heavy-machinery manufacturers.

For technical specifications,pricing,or custom bearing solutions:

Email:paul@newbeetrans.com

Website:www.newbeetrans.com