The 3008 AS-K-M-SP (often written as NN3008-AS-K-M-SP) is a high-precision cylindrical roller bearing manufactured by FAG/INA. It is a double-row bearing designed for high radial load capacity and running accuracy, commonly used in machine tool spindles and precision applications.

Dimensions

• Bore diameter (d): 40 mm
• Outer diameter (D): 68 mm
• Width (B): 21 mm
• Size designation: 40 × 68 × 21 mm

Load Ratings

• Basic dynamic load rating (Cr): ~43,300–45,000 N
• Basic static load rating (C0r): ~55,400–58,500 N
• Fatigue limit load (Cur): ~8,400 N

Speed Limits

• Limiting speed (grease lubrication): ~12,000 rpm
• Limiting speed (oil lubrication): ~15,000 rpm

Mechanical Features

• Design: Double-row cylindrical roller bearing
• Internal clearance: Special precision clearance (SP)
• Tolerance class: High precision (often P5 or better)
• Axial displacement facility (s): 1.2–1.4 mm from central position
• Weight: 0.3 kg
• Radius (r1 min): 1 mm