Product detailed description

The SKF 7212 ACD/P4A is a super-precision, single-row angular contact ball bearing engineered for high-speed and high-accuracy applications. It is designed to accommodate both radial and axial loads acting simultaneously, with the axial load acting in one direction only. This bearing is particularly suitable for machine tool spindles and other precision machinery requiring high running accuracy and load-carrying capacity.

Technical Specifications:

• Dimensions:

  • Bore diameter (d): 60 mm
  • Outside diameter (D): 110 mm
  • Width (B): 22 mm
  • Shoulder diameter of inner ring (d1): 76.4 mm
  • Shoulder diameter of outer ring (D1): 93.6 mm
  • Chamfer dimensions (r1,2 min.): 1.5 mm
  • Chamfer dimensions (r3,4 min.): 0.6 mm
  • Distance from side face to pressure point (a): 30.9 mm

• Load Ratings:

  • Basic dynamic load rating (C): 55.3 kN
  • Basic static load rating (C0): 45 kN
  • Fatigue load limit (Pu): 1.9 kN

• Speed Ratings:

  • Attainable speed for grease lubrication: 11,000 rpm
  • Attainable speed for oil-air lubrication: 18,000 rpm

• Contact Angle:

  • α = 25°

• Ball Diameter:

  • Dw = 14.288 mm

• Number of Balls:

  • z = 16

• Preload and Stiffness:

  • Preload class A (GA): 350 N
  • Static axial stiffness, preload class A: 182 N/µm
  • Preload class B (GB): 700 N
  • Static axial stiffness, preload class B: 238 N/µm
  • Preload class C (GC): 1,400 N
  • Static axial stiffness, preload class C: 315 N/µm
  • Preload class D (GD): 2,800 N
  • Static axial stiffness, preload class D: 424 N/µm

• Mass:

  • 0.81 kg

• Tolerance Class:

  • P4A

This bearing is universally matchable, allowing for effective load sharing when used in pairs or sets without the need for shims or similar devices. It offers very high running accuracy, load-carrying capacity, and relatively high speed and stiffness, making it suitable for demanding applications in precision machinery.