NSK 6306ZZCM is a premium single-row deep groove ball bearing with double metal shields (ZZ) and motor-optimized internal clearance (CM). Engineered for versatile radial/axial load capacity, low noise, and maintenance-free operation, it delivers exceptional stability for electric motors, fans, pumps, and general industrial machinery—setting a global standard for reliable, high-speed rotating performance.
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NSK 6306ZZCM is a premium single-row deep groove ball bearing with double metal shields (ZZ) and motor-optimized internal clearance (CM). Engineered for versatile radial/axial load capacity, low noise, and maintenance-free operation, it delivers exceptional stability for electric motors, fans, pumps, and general industrial machinery—setting a global standard for reliable, high-speed rotating performance.
Bore (d): 30 mm (tolerance: −0.008/+0 mm, P0/ABEC 1)
Outer diameter (D): 72 mm (tolerance: 0/+0.014 mm)
Width (B): 19 mm (tolerance: ±0.05 mm)
Chamfer (rmin): 1.1 mm
Weight: 0.345 kg
Dynamic load rating (Cr): 26.7 kN
Static load rating (C0r): 15.0 kN
Limiting speed (grease): 9,500 rpm
Internal clearance: CM (motor-special CN, ISO 5753)
Shield type: Double steel (ZZ) non-contact dust shields
Inner/outer rings: SUJ2 (100Cr6/AISI 52100) bearing steel. Hardness: 60–64 HRC; high rolling fatigue strength, wear resistance, and dimensional stability.
Rolling balls: SUJ2 high-precision steel. Hardness: 61–65 HRC; uniform load distribution and minimal friction.
Cage: Pressed steel (SPCC). Robust ball guidance, low vibration, and stable high-speed performance.
Shields: Cold-rolled steel (SPCC), anti-corrosive zinc plating.
Hot closed-die forging: Refined grain structure for enhanced mechanical integrity.
CNC turning: Dimensional precision ≤ ±0.003 mm for tight geometric tolerances.
Vacuum heat treatment: Uniform hardening/tempering, minimal distortion, consistent hardness.
Precision grinding: Raceway surface roughness Ra ≤ 0.16 μm.
Superfinishing: Raceway honing (Ra ≤ 0.05 μm) to reduce friction and improve lubricant retention.
Automated assembly & dynamic balancing: Strict noise/vibration control for motor-grade quality.
Standard rating life (L10): 12,000–15,000 hours (ISO 281:2007; radial load 60% Cr, 1,800 rpm, clean NLGI 2 grease).
Key factors: Lubrication quality, contamination, operating temperature (-20°C to +120°C), shaft hardness (≥58 HRC), and alignment accuracy.
Electric motors: Fan motors, pump motors (low noise, CM clearance).
HVAC systems: Blowers, condensers (dust protection, high speed).
Automotive: Alternators, starters, water pumps (versatile load capacity).
Industrial pumps: Centrifugal/gear pumps (continuous operation, reliability).
Household appliances: Washing machines, power tools (quiet, maintenance-free).
General machinery: Conveyors, gearboxes (cost-effective, universal performance).
Lubricant: NSK NS7 lithium complex grease (NLGI 2) or ISO VG 46–68 mineral oil.
Regreasing interval: 1,800–2,200 hours; 600 hours in dusty environments.
Grease quantity: 5–6 g (35–40% of internal free space).
Inspection: Every 600 hours; check noise, vibration, temperature (<75°C), and shield integrity.
Pre-installation: Clean shaft/housing to Ra ≤ 1.6 μm; inspect for burrs/corrosion.
Mounting: Hydraulic press (max 30 kN) or induction heating (70–80°C); avoid direct impact.
Alignment: Radial misalignment ≤ 0.002 mm/100 mm; axial runout ≤ 0.003 mm.
Fastening: Lock nut torque: 35–45 Nm (grade 8.8 bolts).
Post-installation: Manual rotation check; temperature rise <30°C above ambient; vibration testing.
| BRAND | FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI |
| BEARINGS NO. | 6306ZZCM NSK |
| TYPE | DEEP GROOVE BALL BEARING |
| Inner(d)mm | 30 |
| Outer(D)mm | 72 |
| Width(B)mm | 19 |
| WEIGHT/KG | 0.35 |
| EAN CODE | 0029176 016769 |
+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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