BNTB3681224/BH2 Bearing Overview
Image for reference only.
Core Parameters
- Main Dimensions 180mm × 406.42mm × 224mm
- Dynamic Load (Cr) 2440 kN
- Static Load (Cor) 4730 kN
- Weight 170 kg
Bearing Type
Technical Specifications
Basic Information
| Design No. (Model) | 8 | Design identification number or model code |
|---|---|---|
| Weight (Mass) | 170kg | Mass (M) of the bearing, measured in kilograms (kg) |
Boundary Dimensions
| d (Bore Diameter) | 180mm | Internal diameter of inner ring (ISO standard symbol: d) |
|---|---|---|
| D (Outer Diameter) | 406.42mm | External diameter of outer ring (ISO standard symbol: D) |
| B (Width) | 224mm | Overall width of bearing (ISO standard symbol: B) |
| C (Effective Width) | 224mm | Effective width of roller set (ISO standard symbol: C) |
| H (Height) | 113.2mm | 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) | 293.4mm | Effective bearing center distance for mounting |
| F (Positioning Dimension) | 217.4mm | Axial positioning dimension for bearing seats |
| rmin (Chamfer Radius) | 1mm | Minimum fillet radius for chamfered edges |
| K (Roller Factor) | 8 | Factor for effective roller length calculation |
| N* (Roller Quantity) | Number of rollers in bearing assembly |
Basic Load Rating
| Cr (Dynamic Load) | 2440kN | Basic dynamic load rating (ISO 281) |
|---|---|---|
| Cor (Static Load) | 4730kN | Basic static load rating (ISO 281) |
| Cr (Roller) | 1730kN | Dynamic load rating for roller elements |
| Cor (Roller) | 3200kN | Static load rating for roller elements |
| Cr (Radial Max) | 1530kN | Maximum radial dynamic load capacity |
| Cor (Radial Max) | 2170kN | 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
Product Description
The BNTB3681224/BH2 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 180mm bore diameter, 406.42mm outer diameter, and 224mm width, this medium bore backing bearing delivers exceptional performance in demanding rolling mill environments. It features a dynamic load rating of 2440kN and static load rating of 4730kN for reliable operation under heavy rolling loads. The bearing includes premium surface treatment for extreme 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
- premium surface treatment
- superior corrosion protection
Delivery & Service
Delivery Time
In-stock: 3–5 days; OEM/ODM: 20–35 days.
Shipping Methods
Ocean Freight / Land Transport
Warranty
12-month warranty, extendable to 18 months.
Pricing Information
Prices vary by precision & material. Please submit an inquiry for best quote.