Manufactured by CHG Bearing, the 34.21*78.59 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.
34.21*78.59 - Tapered Rollers
Technical Specifications
| Overview | |
|---|---|
| Part Number | 34.21*78.59 |
| Brand | CHG® |
| Product Type | Tapered Roller |
| Taper Angle | 36' |
| Dimensions | |
| Roller Length, Lw | 78.59 mm |
| Center Recess Diameter | 18 mm |
| Through-hole Diameter | - mm |
| Center Recess Depth | 1.5 mm |
| Large-end Diameter, Dw | 34.21 mm |
| Spherical End Radius, SR | 1551 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 | -0.4 to +0.4 mm |
| Radial Chamfer — Large End | 1 mm |
| Radial Chamfer Tolerance — Large End | -0.4 to +0.4 mm |
| Axial Chamfer — Small End | 1 mm |
| Axial Chamfer Tolerance — Small End | -0.4 to +0.4 mm |
| Radial Chamfer — Small End | 1.2 mm |
| Radial Chamfer Tolerance — Small End | -0.4 to +0.4 mm |
| Performance | |
| Spherical End Surface Roughness, Ra (µm) | 0.25 µm |
| Dimensional & Geometrical Accuracy | |
| Roller Length Tolerance | -0.5 to 0 mm |
| End-face Runout | - mm |
| Diameter Variation Between Ends | ±0.004 mm |
| Roundness | 0.003 mm |
| Ovality | 0.003 mm |
34.21*78.59 34.21 mm 78.59 mm 1551 mm Frequently Asked Questions about 34.21*78.59 Tapered Rollers
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
For international ocean and air freight, CHG Bearing packs 34.21*78.59 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.
Each 34.21*78.59 produced in CHG Bearing manufacturing facilities features accurately profiled corner chamfers complying with DIN 5412 / ISO standard corner radii. When designing mating shafts and housing shoulders, machining an undercut or fillet radius strictly within the inner ring clearance limit ( mm bore side) ensures perfect planar contact without edge binding.
Absolutely. The CHG Bearing 34.21*78.59 Tapered Rollers is a 1:1 direct interchange for renowned brands, matching part numbers: SKF 34.21*78.59, FAG 34.21*78.59, NSK 34.21*78.59. It shares identical envelope boundary dimensions, load capacities, and shaft fits, allowing instant drop-in replacement without retrofitting your machinery.
Built for demanding industrial environments, the 34.21*78.59 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.
