The 3007 AS-K-M-SP (often listed as NN3007-AS-K-M-SP) is a super-precision double-row cylindrical roller bearing with a 35 mm bore, 62 mm outer diameter, and 20 mm width. It features a tapered bore (1:12), brass cage, and is designed for high radial load capacity, rigidity, and running accuracy, making it ideal for machine tool spindle applications.

Dimensions

• Bore diameter (d): 35 mm
• Outer diameter (D): 62 mm
• Width (B): 20 mm
• Size designation: 35 × 62 × 20 mm

Mechanical Design

• Type: Double-row cylindrical roller bearing
• Inner ring: Solid with three ribs
• Outer ring: Solid, without ribs (allows axial displacement in both directions)
• Bore type: Tapered bore, taper 1:12 (enables precise clearance/preload adjustment during mounting)
• Cage material: Solid brass cage (durable and stable at high speeds)
• Separable design: Simplifies mounting/dismounting, especially with interference fits

Load & Speed Ratings

• Dynamic load rating (Cr): ~39,000–41,000 N
• Static load rating (C0r): ~45,000–48,000 N
• Fatigue limit load (Cur): ~7,000–8,000 N
• Limiting speed (grease): ~14,000 rpm
• Limiting speed (oil): ~18,000 rpm