S71908 ACB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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S71908 ACB/P4A Bearing Product Overview & Core Advantages
The S71908 ACB/P4A is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. Engineered as a single-row bearing with a 25° contact angle, it excels at supporting combined loads—simultaneously handling significant radial forces and thrust loads in one direction. Manufactured to the stringent P4 (ABEC-7) tolerance class, it ensures minimal runout and smooth, precise operation. Its compact design, featuring a 40 mm bore and 12 mm width, makes it an ideal, space-saving solution for high-speed spindles and other precision machinery.
S71908 ACB/P4A Bearing Model Code Explained, Specifications & Naming Convention
- S7: Indicates a series of high-precision, high-speed angular contact ball bearings.
- 1908: Denotes the standard size designation (40mm bore, 62mm OD, 12mm width).
- ACB: Signifies a specific internal design and contact angle of 25° optimized for high rigidity and speed.
- P4A: Defines the tolerance class P4 (ABEC-7) and a specific set of running accuracy standards for precision applications.
S71908 ACB/P4A Bearing Structural Features & Performance Benefits
The S71908 ACB/P4A's performance is a direct result of its superior construction. The phenolic resin cage is lightweight and robust, contributing to lower inertia, smoother operation, and the achievement of a high limiting speed of 28,000 rpm. The 25° contact angle is optimally balanced to provide high rigidity and excellent thrust load capacity. Manufactured from high-grade chrome steel for both rings and balls, the bearing ensures long-term durability and consistent performance. Being pre-lubricated and sealed, it offers a maintenance-free service life within its specified operating range.
S71908 ACB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Where extreme accuracy and minimal vibration are required.
- High-Frequency Motors and High-Speed Pumps.
- Medical Equipment and Dental Handpieces.
- Semiconductor Manufacturing Equipment.
