Super Precision Ball Bearings

Bearing manufacturers promote certain bearings as “Super Precision (MM),” “Super High Precision (MMV),” and “Ultra Precision (MMX)” bearings. These are factory defined terms used to describe ISO-P4 through ISO-P2 (ABEC-7 through ABEC-9) tolerances.

More specifically, Super Precision Bearings (MM) are typically manufactured to ISO-P4 (ABEC-7) tolerances. Ultra-Precision bearings (MMX) are usually manufactured to ISO P-2 (ABEC-9) tolerances. Super High Precision Bearings (MMV) bearings are manufactured partly to ISO-P4 tolerances and partly to tolerances defined by ISO P-2 specifications.

Super Precision bearings are used in applications involving high speeds, extreme accuracy and rigidity in equipment like high-grade machine tools, woodworking machines, gas turbines and sensitive precision instruments.

The main bearing types that manufacturers offer in precision tolerances are:

  • Sealed Angular Contact Bearings (the most common)
  • Angular Contact Thrust ball bearings
  • High Precision deep groove bearings
  • Cylindrical Bearings
  • Ball Screw Support
  • Tapered Roller

Because we’re an independent business we can source Precision bearings from RHP, Nachi, NTN, NSK, KOYO, Fafnir, and SKF.

Nachi Precision Bearing PDF

Need Assistance Selecting the correct Super Precision Bearings?

If you need assistance selecting the right bearings for your particular application, please give us a call and talk to one of our knowledgeable staff. We’re here to help and problem solve for you.