NSK 6901ZZCM is a high-precision miniature single-row deep groove ball bearing with double metal shields (ZZ) and motor-optimized radial clearance (CM). Engineered for compact spaces, low vibration, and reliable radial/axial load performance, it delivers exceptional high-speed stability and contamination resistance—ideal for small precision motors, office equipment, and miniature industrial machinery.
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NSK 6901ZZCM is a high-precision miniature single-row deep groove ball bearing with double metal shields (ZZ) and motor-optimized radial clearance (CM). Engineered for compact spaces, low vibration, and reliable radial/axial load performance, it delivers exceptional high-speed stability and contamination resistance—ideal for small precision motors, office equipment, and miniature industrial machinery.
Bore (d): 12 mm (tolerance: −0.006/+0 mm, P0/ABEC 1)
Outer diameter (D): 24 mm (tolerance: 0/+0.011 mm)
Width (B): 6 mm (tolerance: ±0.04 mm)
Chamfer (rmin): 0.3 mm
Weight: 0.011 kg
Dynamic load rating (Cr): 2.89 kN
Static load rating (C0r): 1.46 kN
Limiting speed (grease): 30,000 rpm
Internal clearance: CM (motor-special CN, ISO 5753)
Shield type: Double non-contact steel shields (ZZ)
Precision class: ISO P0 (ABEC 1)
Inner/outer rings: SUJ2 (GCr15/100Cr6/AISI 52100) bearing steel. Hardness: 60–64 HRC; high rolling fatigue strength, wear resistance, and dimensional stability.
Rolling balls: SUJ2 high-precision steel (3.0 mm). Hardness: 61–65 HRC; uniform load distribution and minimal friction.
Cage: Pressed steel (SPCC). Stable ball guidance, low vibration, and high-speed compatibility.
Surface: Anti-corrosion phosphating treatment for enhanced rust protection.
Hot precision forging: Refined grain structure for maximum structural integrity.
CNC turning: Dimensional accuracy ≤ ±0.002 mm for tight geometric tolerances.
Vacuum heat treatment: Uniform hardening/tempering, minimal distortion, consistent hardness.
Precision grinding: Raceway roughness Ra ≤ 0.12 μm.
Superfinishing: Raceway honing (Ra ≤ 0.04 μm) reduces friction and improves lubricant retention.
Automated assembly: 100% noise/vibration inspection for motor-grade quality.
Standard rating life (L10): 15,000–18,000 hours (ISO 281:2007; radial load 60% Cr, 3,000 rpm, clean NLGI 2 grease).
Key factors: Lubrication condition, contamination, operating temperature (-30°C to +120°C), shaft hardness (≥58 HRC) and alignment accuracy.
Small electric motors: Precision motors, fan motors, spindle motors (low noise, CM clearance).
Office equipment: Printers, copiers, scanners (compact size, high-speed stability).
Medical devices: Dental tools, precision instruments (clean operation, long life).
Household appliances: Small fans, power tools, beauty devices (maintenance-light).
Automotive: Sensors, actuators, small automotive motors (vibration resistance).
Industrial automation: Robotics, miniature conveyors (space-saving design).
Lubricant: NSK LG3 lithium grease (NLGI 2) or ISO VG 32–46 mineral oil.
Regreasing interval: 2,000–2,500 hours; 800 hours in dusty environments.
Grease quantity: 0.4–0.5 g (40–45% of internal free space).
Inspection: Every 800 hours; check noise, vibration, operating temperature (<70°C) and shield integrity.
Pre-installation: Clean shaft/housing to Ra ≤ 1.6 μm; inspect for burrs/corrosion.
Mounting: Hydraulic press (max 10 kN) or induction heating (60–70°C); avoid direct impact.
Alignment: Radial misalignment ≤ 0.001 mm/100 mm; axial runout ≤ 0.002 mm.
Fastening: Lock nut torque: 8–12 Nm (grade 8.8 bolts).
Post-installation: Manual rotation check; temperature rise <25°C above ambient; vibration testing.
| BRAND | FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI |
| BEARINGS NO. | 6901ZZCM NSK |
| TYPE | DEEP GROOVE BALL BEARING |
| Inner(d)mm | 12 |
| Outer(D)mm | 24 |
| Width(B)mm | 6 |
| WEIGHT/KG | 0.0108 |
| EAN CODE |
+86-510-6831-3099
No.105, Huixin Road,Yuqi Industrial Park, Huishan District, hunqi Road, Yuqi Town, Wuxi, Jiangsu Province, P.R.CHINA
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