FAG B7021-E-T-P4S-UM Super Precision Spindle Bearing

Description

This FAG B7021-E-T-P4S-UM is a single-row angular contact ball bearing designed for high-precision applications such as machine tool spindles. With a 25-degree contact angle and P4S tolerance class, it provides high rigidity and running accuracy for combined radial and axial loads. The universal matching design allows for flexible mounting arrangements. Made in Germany, this bearing represents the highest standards in quality and performance.

Specifications

• Manufacturer: FAG
• Part Number: B7021-E-T-P4S-UM
• Type: Spindle Bearing / Angular Contact Ball Bearing
• Bore Diameter: 105 mm
• Outside Diameter: 160 mm
• Width: 29 mm
• Contact Angle: 25 degrees
• Cage: Textolite (laminated phenolic resin)
• Precision Class: P4S (DIN 620), equivalent to ABEC 7
• Arrangement: Universal matching, single bearing

Label Info

• Model: B7021-E-T-P4S-UM
• EAN: 4012801752022

Application

Primarily used in the main spindles of high-speed milling machines, lathes, grinding machines, and other precision rotating equipment where rigidity and accuracy are critical.

Country of Origin

Made in Germany.

CO2 Impact

Opting for this component avoids the production of a new one, saving an estimated 4.2 kg of CO2. This is comparable to the emissions from a 21-kilometer car journey.

Availability

This item is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

What does the 'UM' suffix in B7021-E-T-P4S-UM signify?

The 'UM' stands for Universal Matching. This means the bearing is manufactured to such tight tolerances that it can be mounted in any arrangement (back-to-back, face-to-face, or tandem) with another 'UM' bearing without requiring specific pairing at the factory. This provides great flexibility for machine designers.

The optimal preload depends heavily on the specific application's speed, load, and desired stiffness. It should be calculated by a qualified engineer. For lubrication, high-speed grease or an oil-air lubrication system is typically required for spindle bearings of this precision class to manage heat and ensure long life. Always consult the FAG mounting and maintenance guide for specifics.

The textolite (phenolic resin) cage offers excellent high-speed performance and low friction. However, it has an upper operating temperature limit, typically around 100-120 deg C. It's also not suitable for applications in a vacuum or with certain aggressive chemicals. For extreme temperature or chemical environments, a bearing with a different cage material may be necessary.

Last Update: Friday, March 13, 2026

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