Manufactured by CHG Bearing, the 55.8*78.63 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.
55.8*78.63 - Tapered Rollers
Technical Specifications
| Overview | |
|---|---|
| Part Number | 55.8*78.63 |
| Brand | CHG® |
| Product Type | Tapered Roller |
| Taper Angle | 2°37‘ |
| Dimensions | |
| Roller Length, Lw | 78.63 mm |
| Center Recess Diameter | 26 mm |
| Through-hole Diameter | - mm |
| Center Recess Depth | 2 mm |
| Large-end Diameter, Dw | 55.8 mm |
| Spherical End Radius, SR | 577 mm |
| Through-hole Chamfer | - mm |
| Large-end Diameter Tolerance | -0.005 to +0.03 mm |
| Through-hole Coaxiality | - mm |
| Rolling Surface Roughness, Ra (µm) | 0.25 |
| Axial Chamfer — Large End | 1.5 mm |
| Axial Chamfer Tolerance — Large End | -0.5 to +0.5 mm |
| Radial Chamfer — Large End | 1.2 mm |
| Radial Chamfer Tolerance — Large End | -0.4 to +0.4 mm |
| Axial Chamfer — Small End | 1.2 mm |
| Axial Chamfer Tolerance — Small End | -0.4 to +0.4 mm |
| Radial Chamfer — Small End | 1.5 mm |
| Radial Chamfer Tolerance — Small End | -0.5 to +0.5 mm |
| Performance | |
| Spherical End Surface Roughness, Ra (µm) | 0.32 µm |
| Dimensional & Geometrical Accuracy | |
| Roller Length Tolerance | -0.5 to 0 mm |
| End-face Runout | - mm |
| Diameter Variation Between Ends | ±0.003 mm |
| Roundness | 0.003 mm |
| Ovality | 0.003 mm |
55.8*78.63 55.8 mm 78.63 mm 577 mm Frequently Asked Questions about 55.8*78.63 Tapered Rollers
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
The CHG Bearing 55.8*78.63 is rated for limiting speeds up to standard rated RPM under forced oil-mist or circulating oil lubrication regimes. When lubricated with factory-filled synthetic high-speed grease, safe continuous velocity is maintained at approximately 75% to 85% of the maximum nominal limit, preventing thermal runaway.
Model 55.8*78.63 is manufactured by CHG Bearing in standard Normal clearance (CN) for ambient temperature transmission, and C3 or C4 clearance for heavy duty applications. C3 clearance compensates for radial shrinkage caused by tight shaft press-fits (bore mm) and steep thermal gradients between inner and outer rings.
For international ocean and air freight, CHG Bearing packs 55.8*78.63 with industrial VCI anti-corrosion barrier wrapping, sealed polybags, individual cartons, and fumigated ocean-worthy wooden crates. This multi-layer barrier guarantees rust-free storage for a minimum shelf life of 24 to 36 months.
Sourcing 55.8*78.63 directly from CHG Bearing eliminates intermediate brokerage markups while granting you factory-direct engineering backup, rigorous ISO-certified quality assurance, competitive volume wholesale pricing, and dependable supply chain stability for Tapered Rollers.
