Manufactured by CHG Bearing, the 39.8*55.2 is a precision Tapered Rollers. Key dimensional parameters include a mm bore diameter, a mm outer diameter, and a mm overall width. This component is designed to meet standard load requirements and ensure consistent operational performance. For comprehensive technical evaluation, please explore the detailed specifications, dimensional data, product images, and CAD drawings provided below. A complete PDF data sheet is also readily available for direct download to support your engineering and procurement needs.
39.8*55.2 - Tapered Rollers
Technical Specifications
| Overview | |
|---|---|
| Part Number | 39.8*55.2 |
| Brand | CHG® |
| Product Type | Tapered Roller |
| Taper Angle | 1°30' |
| Dimensions | |
| Roller Length, Lw | 55.2 mm |
| Center Recess Diameter | 20 mm |
| Through-hole Diameter | - mm |
| Center Recess Depth | 1.5 mm |
| Large-end Diameter, Dw | 39.8 mm |
| Spherical End Radius, SR | 722 mm |
| Through-hole Chamfer | - mm |
| Large-end Diameter Tolerance | -0.012 to +0.02 mm |
| Through-hole Coaxiality | - mm |
| Rolling Surface Roughness, Ra (µm) | 0.25 |
| Axial Chamfer — Large End | 1.2 mm |
| Axial Chamfer Tolerance — Large End | -0.2 to +0.2 mm |
| Radial Chamfer — Large End | 1 mm |
| Radial Chamfer Tolerance — Large End | -0.2 to +0.2 mm |
| Axial Chamfer — Small End | 1 mm |
| Axial Chamfer Tolerance — Small End | -0.2 to +0.2 mm |
| Radial Chamfer — Small End | 1.2 mm |
| Radial Chamfer Tolerance — Small End | -0.2 to +0.2 mm |
| Performance | |
| Spherical End Surface Roughness, Ra (µm) | 0.4 µm |
| Dimensional & Geometrical Accuracy | |
| Roller Length Tolerance | -0.3 to 0 mm |
| End-face Runout | - mm |
| Diameter Variation Between Ends | ±0.005 mm |
| Roundness | 0.003 mm |
| Ovality | 0.003 mm |
39.8*55.2 39.8 mm 55.2 mm 722 mm Frequently Asked Questions about 39.8*55.2 Tapered Rollers
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
As a primary manufacturer, CHG Bearing supports both trial batch evaluations and container-load supply for 39.8*55.2. Standard catalog sizes are stocked for rapid 3–7 day dispatch, while high-volume OEM production runs typically dispatch within 30–45 days.
Built for demanding industrial environments, the 39.8*55.2 Tapered Rollers by CHG Bearing boasts a dynamic load rating (Cr) of standard dynamic and a static load threshold (C0r) of standard static. The optimized internal raceway geometry balances stress distribution, mitigating edge loading even when operating under peak mechanical stresses.
Quality starts with raw material selection: CHG Bearing crafts 39.8*55.2 inner and outer rings from high-purity High-Quality Chrome Steel (GCr15/100Cr6). Our raw billets undergo vacuum degassing and secondary ESR (electroslag remelting) processes to drastically eliminate non-metallic sulfide and oxide inclusions, elevating subsurface contact fatigue resistance.
To extend the trouble-free lifespan of CHG Bearing 39.8*55.2, preventive maintenance routines should monitor operating housing temperature (normally maintaining below 70°C) and conduct regular vibration FFT analysis to identify early raceway micro-pitting before unexpected line halts occur.
