Manufactured by CHG Bearing, the 2787/1278 is a precision Four-Point Contact Ball Slewing Bearings. Key dimensional parameters include a 1378 mm bore diameter, a 1695 mm outer diameter, and a 165 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.
2787/1278 - Four-Point Contact Ball Slewing Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 2787/1278 |
| Brand | CHG® |
| Gear Type | Internal Gear |
| Characteristics | |
| Bearing Type | Single-row Four-point Contact Ball Slewing Bearing |
| Row Configuration | Single-row |
| Dimensions | |
| Bore Diameter (d) | 1378 mm |
| Width (B) | 165 mm |
| Outer Diameter (D) | 1695 mm |
| Number of Lubrication Holes n1 | 8 |
| Mounting Dimensions | |
| Outer Ring Mounting Hole P.C.D. D1 | 1636 mm |
| Inner Ring Mounting Hole P.C.D. D2 | 1434 mm |
| Lubrication Port Thread / Size Φ1 | 10 |
| Inner Ring Mounting Hole Count n2 | 40 |
| Inner Ring Mounting Hole Specification Φ2 (Ø / Thread) | 27 |
| Outer Ring Mounting Hole Count n3 | 40 |
| Outer Ring Mounting Hole Specification Φ3 (Ø / Thread) | 30 |
| Gear Data | |
| Gear Module m | 18 mm |
| Gear Tip Diameter De | 1278 mm |
| Number of Gear Teeth z | 72 |
| Gear Face Width b | 140 mm |
| Addendum Modification Coefficient x | 0.5 |
| Reference Data | |
| Reference Mass (kg) | 949 kg |
2787/1278 1695 mm 1378 mm 1636 mm 1434 mm 165 mm Frequently Asked Questions about 2787/1278 Four-Point Contact Ball Slewing Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
To match diverse operational dynamics, CHG Bearing supplies 2787/1278 with multiple cage configurations: high-strength pressed steel ribbon cages for standard duty, solid machined brass cages (M/CA) for heavy vibration and shock loads, or lightweight glass-fiber reinforced polyamide cages (TN9/TVP) for high acceleration and ultra-low noise.
Quality starts with raw material selection: CHG Bearing crafts 2787/1278 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.
Engineered according to international ISO boundary plans, CHG Bearing supplies 2787/1278 with a precision bore diameter (d) of 1378 mm, an outside diameter (D) of 1695 mm, and a nominal ring width (B) of 165 mm. This configuration yields an effective cross-sectional wall thickness of 158.5 mm and an envelope ratio (D/d) of 1.23, delivering compact rigidity for OEM machinery housings.
The CHG Bearing 2787/1278 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.
