S7004 ACDGC/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S7004 ACDGC/P4A Bearing Product Overview & Core Advantages
The S7004 ACDGC/P4A is a high-precision, single-row angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. Engineered to accommodate combined loads (radial and axial loads in one direction), it features a 25° contact angle and Moderate (Class C) preload for superior operational stability and minimal deflection. Its P4A super-precision tolerance class ensures extremely tight dimensional control, making it ideal for high-speed spindles and other precision machinery where running accuracy is paramount. The bearing is universally matchable (SU designation), allowing for flexible mounting arrangements in sets of two or more to handle complex load scenarios.
S7004 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7004 | Basic bearing series and size designation (20mm bore, 42mm OD, 12mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | High-Grade Phenolic Resin (Polyamide) Cage. |
| GC | Specifies a Moderate preload (Class C) for optimal stiffness and speed performance. |
| P4A | Indicates a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy. |
S7004 ACDGC/P4A Bearing Structural Features & Performance Benefits
- Superior Rigidity and Running Accuracy: The combination of a 25° contact angle and a factory-set moderate preload (Class C) provides high system stiffness, minimizing axial and radial play under load. This is further enhanced by the P4A precision tolerance class, which guarantees extremely tight control over bearing dimensions and runout for superior performance in high-precision applications.
- Optimized High-Speed Performance: The lightweight and robust phenolic resin cage (D) ensures excellent dimensional stability and low friction at high rotational speeds, contributing to the bearing's high limiting speed of 100,500 rpm. The preload optimization also prevents skidding at high velocities.
- High Load Capacity: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers a robust dynamic load rating of 1872 lbf and a static load rating of 934 lbf, enabling it to handle significant combined radial and one-direction axial loads.
- Sealed and Pre-Lubricated for Reliability: As a sealed bearing, it is protected from contamination and is pre-lubricated with grease, offering a maintenance-free solution within its specified temperature range of -30°C to 110°C.
S7004 ACDGC/P4A Bearing Typical Application Areas
The S7004 ACDGC/P4A is engineered for high-performance applications where precision, speed, and rigidity are critical. Its primary uses include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes.
- Precision Rotary Systems: Industrial robots, rotary tables, and indexing heads.
- High-Frequency Motors and Spindles: PCB drilling spindles, dental handpieces, and small turbine applications.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments requiring smooth, accurate rotation.
