Manufactured by CHG Bearing, the 3-640 is a precision Four-Point Contact Ball Slewing Bearings. Key dimensional parameters include a 775 mm bore diameter, a 1000 mm outer diameter, and a 64 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.
3-640 - Four-Point Contact Ball Slewing Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 3-640 |
| Brand | CHG® |
| Gear Type | Gearless |
| Characteristics | |
| Bearing Type | Single-row Four-point Contact Ball Slewing Bearing |
| Row Configuration | Single-row |
| Dimensions | |
| Bore Diameter (d) | 775 mm |
| Width (B) | 64 mm |
| Outer Diameter (D) | 1000 mm |
| Number of Lubrication Holes n1 | 2 |
| Mounting Dimensions | |
| Outer Ring Mounting Hole P.C.D. D1 | 948 mm |
| Inner Ring Mounting Hole P.C.D. D2 | 802 mm |
| Lubrication Port Thread / Size Φ1 | 8 |
| Inner Ring Mounting Hole Count n2 | 12/12 |
| Inner Ring Mounting Hole Specification Φ2 (Ø / Thread) | 13/12 |
| Outer Ring Mounting Hole Count n3 | 24 |
| Outer Ring Mounting Hole Specification Φ3 (Ø / Thread) | 12 |
| Reference Data | |
| Reference Mass (kg) | 112 kg |
3-640 1000 mm 775 mm 64 mm 802 mm 948 mm Frequently Asked Questions about 3-640 Four-Point Contact Ball Slewing Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Engineered according to international ISO boundary plans, CHG Bearing supplies 3-640 with a precision bore diameter (d) of 775 mm, an outside diameter (D) of 1000 mm, and a nominal ring width (B) of 64 mm. This configuration yields an effective cross-sectional wall thickness of 112.5 mm and an envelope ratio (D/d) of 1.29, delivering compact rigidity for OEM machinery housings.
To safeguard CHG Bearing 3-640 against fretting wear and false brinelling during transport or vibration, assemble mating surfaces (775 mm x 1000 mm) using anti-fretting mounting paste. Maintaining strict alignment and avoiding prolonged static vibration will preserve raceway polish.
To extend the trouble-free lifespan of CHG Bearing 3-640, 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.
To ensure optimum performance of CHG Bearing 3-640 Four-Point Contact Ball Slewing Bearings under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 775 mm bore. For the 1000 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
