Our broad line of Timken® Fafnir® ball screw support bearings includes single- and double-row designs with a variety of mounting configurations. We offer flanged and non-flanged series for both standard and rotating nut mountings. Housed cartridge and pillow block units facilitate bolting to machine tool surfaces.

Design Attributes

• Materials include clean steel for longer service life.
• Incorporates tighter preload tolerances for chatter-free cutting and tighter width tolerances for easy fit without regrinding end caps.
• Innovative cage design permits additional balls for higher load capacity.
• Features ABEC 9/ISO P2 axial running tolerances to deliver maximum accuracy for precise tool positioning and repeatability.
• Double-row series has integral, low-torque contact seals to exclude contaminants for reliable operation and extended service life.
• Available in flanged (MMF) and nonflanged (MMN) series, simplifying installation for both standard and rotating nut mountings.

Applications

• Motion control for grinding, milling and machining centers

Timken® Fafnir® ball screw support bearings are made from steel that is among the cleanest in the world. The lack of impurities and inclusions in our base materials enhances the durability and life of our bearings. This is critical in today’s harsh metal-cutting environments where contamination from cutting fluids and debris is common.

Using clean steel as a foundation, we manufacture ball screw bearings to ABEC 9/ISO P2 axial running tolerances to reduce runout, which has a positive impact on positioning accuracy. Our bearings feature preload tolerances that are among the tightest in the industry. We achieve consistent preload levels by matching the ring offsets, and in our double-row design, the two-piece inner ring is matched with both the outer ring and cages. These manufacturing and assembly controls result in improved resolution and consistency in the machine duty cycle.

Our line of ball screw bearings is designed to develop low drag torque with control of lateral eccentricity and preload tolerances to enhance positioning consistency. Our attention to detail results in greater accuracy and repeatability, which helps to maintain the highest precision of your finished parts and ultimately improves your company’s overall productivity.

To maximize axial rigidity, Timken Fafnir bearings incorporate 60-degree contact angles and a maximum complement of balls. This design produces lower tool deflections and chatter-free cutting. You can choose steel balls, made from the same clean steel as the inner and outer rings, or ceramic balls for high-speed and rapid acceleration operating needs. You also can request customized preloads and specific lubricants to accommodate special application requirements.