BNTB2045120/IS Bearing Technical Specifications
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- Bore Diameter(d) 100mm
- Outer Diameter (D) 225mm
- Width(B) 120mm
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- Dynamic Load Rating (Cr) 740kN
- Static Load Rating (Cor) 1410kN
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- Weight 24.5kg
The BNTB2045120/IS BNTB Series Backing Bearing is engineered for rolling mill backup positions requiring single row cylindrical rollers, special internal clearance and mill housing applications. With dimensions of 100mm bore diameter, 225mm outer diameter, and 120mm width, this small bore backing bearing delivers exceptional performance in demanding rolling mill environments. It features a dynamic load rating of 740kN and static load rating of 1410kN for reliable operation under heavy rolling loads. The bearing includes special internal clearance for specific operating conditions for enhanced performance in specific operating conditions.
Primary applications:
- Hot and cold rolling mills
- Strip processing lines
- Plate rolling mills
- Bar and rod mills
- Section rolling mills
- Backup roll assemblies
Key technical features:
- single row cylindrical rollers
- special internal clearance
- mill housing applications
- special internal clearance
Basic Information
| Design No. (Model) | 8.2 | Design identification number or model code |
|---|---|---|
| Weight (Mass) | 24.5kg | Mass (M) of the bearing, measured in kilograms (kg) |
Boundary Dimensions
| d (Bore Diameter) | 100mm | Internal diameter of inner ring (ISO standard symbol: d) |
|---|---|---|
| D (Outer Diameter) | 225mm | External diameter of outer ring (ISO standard symbol: D) |
| B (Width) | 120mm | Overall width of bearing (ISO standard symbol: B) |
| C (Effective Width) | 120mm | Effective width of roller set (ISO standard symbol: C) |
| H (Height) | 62.5mm | Overall height of bearing assembly |
| d1 (Inner Step Diameter) | Diameter of inner ring step for axial location | |
| D1 (Outer Step Diameter) | Diameter of outer ring step for housing fit | |
| E (Mounting Dimension) | 165.3mm | Effective bearing center distance for mounting |
| F (Positioning Dimension) | 120.3mm | Axial positioning dimension for bearing seats |
| rmin (Chamfer Radius) | 1mm | Minimum fillet radius for chamfered edges |
| K (Roller Factor) | 5 | Factor for effective roller length calculation |
| N* (Roller Quantity) | Number of rollers in bearing assembly |
Basic Load Rating
| Cr (Dynamic Load) | 740kN | Basic dynamic load rating (ISO 281) |
|---|---|---|
| Cor (Static Load) | 1410kN | Basic static load rating (ISO 281) |
| Cr (Roller) | 540kN | Dynamic load rating for roller elements |
| Cor (Roller) | 990kN | Static load rating for roller elements |
| Cr (Radial Max) | 600kN | Maximum radial dynamic load capacity |
| Cor (Radial Max) | 860kN | Maximum radial static load capacity |
Superior Material & Durability
Manufactured from premium G20Cr2Ni4A carburized steel with advanced heat treatment:
- Carburized layer depth ≥2.0mm
- Surface hardness HRC60-64
- Core toughness HRC30-40
- 40% longer service life
P4-Grade Precision Engineering
Meets ISO P4/ABEC 9 standards:
- Dimensional tolerance ±2μm
- Roundness error ≤0.5μm
- Cylindricity error ≤1μm
- Surface roughness Ra≤0.025μm
- 30% reduced friction
Rigorous Quality Control
- ISO 9001 certified manufacturing
- Full dimensional inspection reports
- Hardness gradient testing
- Dynamic performance evaluation
- 100% factory inspection
Delivery Time
- For in-stock own-brand bearings, Dalian JinYu HuaYang guarantees shipment arrangement within 3–5 days after payment confirmation.
- For OEM/ODM orders, the production and delivery lead time for a full container typically ranges from 20–35 days (depending on order complexity).
Shipping Methods
Ocean Freight/Land Transport
Warranty
We provide 12-month warranty, extendable to 18 months via authorized JinYu distributors.
Pricing Information
Bearings prices vary by precision grade, raw material quality, and market dynamics. For customized quotes, please submit an inquiry via our contact form.