SKF 71911 ACD/P4A Super-precision Angular Contact Ball Bearing

Description

The SKF 71911 ACD/P4A is a single-row super-precision angular contact ball bearing designed for applications requiring high rigidity and rotational accuracy at high speeds. With its 25-degree contact angle, it is optimized to accommodate combined radial and axial loads. This bearing is an excellent choice for machine tool spindles and other precision machinery.

Specifications

• Bore Diameter: 55 mm
• Outside Diameter: 80 mm
• Width: 13 mm
• Contact Angle: 25 degrees
• Precision Class: P4A (equivalent to ABEC 7)
• Arrangement: Universal matching for use in sets
• Material: High-grade bearing steel

Label Info

• Brand: SKF
• Model: 71911 ACD/P4A
• EAN: 7316570084280

Application

This bearing is primarily used in high-speed, high-precision applications such as milling machines, lathes, grinding machines, high-speed pumps, and robotics where accuracy and reliability are critical.

Country of Origin

Made in Italy.

CO2 Impact

By purchasing this pre-owned but unused bearing, you contribute to a circular economy and avoid the emission of approximately 0.46 kg of CO2 associated with the production of a new one. This saving is comparable to charging a modern smartphone 55 times.

Availability

This item is new in its original, factory-sealed packaging. It is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

Question?

What does the ACD/P4A suffix mean for this SKF bearing?

The suffix breaks down as follows: 'AC' indicates a 25-degree contact angle. 'D' refers to SKF's optimized internal design. 'P4A' signifies a very high precision tolerance class (ISO Class 4 / ABEC 7), ensuring exceptional dimensional and running accuracy.

What are the best practices for handling and mounting a super-precision bearing like this?

Always handle this bearing in a clean, dust-free environment. Do not unwrap it until immediately before mounting. Use appropriate tools, like induction heaters for controlled heating, and ensure the shaft and housing meet the required dimensional and geometric tolerances to prevent premature failure.

Can this bearing be used with any type of lubrication?

No, super-precision bearings require specific lubrication. For high-speed applications, a filtered, high-quality grease or an oil-air lubrication system is typically recommended. The choice depends on the operational speed (nDm value), load, and temperature. Always consult the SKF technical manual for the correct lubricant type and quantity.

Last Update: Friday, March 13, 2026

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