Manufactured by CHG Bearing, the 3-940G is a precision Crossed Roller Slewing Bearings. Key dimensional parameters include a 2300 mm bore diameter, a 2800 mm outer diameter, and a 208 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.
3-940G - Crossed Roller Slewing Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 3-940G |
| Brand | CHG® |
| Gear Type | External Gear |
| Characteristics | |
| Bearing Type | Single-row Crossed Roller Slewing Bearing |
| Row Configuration | Single-row |
| Dimensions | |
| Bore Diameter (d) | 2300 mm |
| Width (B) | 208 mm |
| Outer Diameter (D) | 2800 mm |
| Inner/Outer Ring Height H1 | 180 mm |
| End-face Height Difference h | 18 mm |
| Number of Lubrication Holes n1 | 6 |
| Mounting Dimensions | |
| Outer Ring Mounting Hole P.C.D. D1 | 2710 mm |
| Inner Ring Mounting Hole P.C.D. D2 | 2390 mm |
| Lubrication Port Thread / Size Φ1 | 10 |
| Inner Ring Mounting Hole Count n2 | 48 |
| Inner Ring Mounting Hole Specification Φ2 (Ø / Thread) | 36 |
| Outer Ring Mounting Hole Count n3 | 42 |
| Outer Ring Mounting Hole Specification Φ3 (Ø / Thread) | 38 |
| Gear Data | |
| Gear Module m | 20 mm |
| Gear Tip Diameter De | 2162.75 mm |
| Number of Gear Teeth z | 110 |
| Gear Face Width b | 175 mm |
| Addendum Modification Coefficient x | 0 |
| Reference Data | |
| Reference Mass (kg) | 2756 kg |
3-940G 2800 mm 2300 mm 208 mm 2710 mm 2390 mm Frequently Asked Questions about 3-940G Crossed Roller Slewing Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
When fitting 3-940G over a 2300 mm shaft, CHG Bearing strictly recommends uniform induction heating (controlled between 90°C and 110°C) or precision hydraulic press sleeves. Under no circumstances should direct impact blows be struck against the rings or cage, as shock loads cause brinelling indents and premature spalling.
Standard batches of CHG Bearing 3-940G conform strictly to ISO Class Normal (ABEC-1). For high-precision machine tool spindles, gearboxes, or robotics requiring tighter runouts, CHG Bearing can provide custom batches graded to ISO Class 6 (P6/ABEC-3) or ISO Class 5 (P5/ABEC-5) with 100% micrometer verification.
Model 3-940G 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 2300 mm) and steep thermal gradients between inner and outer rings.
To ensure optimum performance of CHG Bearing 3-940G Crossed Roller Slewing Bearings under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 2300 mm bore. For the 2800 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
