7209BW NSK

Angular Contact Ball Bearing Single Row 7209BW NSK

NSK 7209BW is a high-performance single-row angular contact ball bearing designed for combined radial and axial load conditions. Engineered with a 40° contact angle and precision manufacturing, it delivers high rigidity, low friction, and stable high-speed operation—ideal for precision machinery, automotive transmissions, and industrial gear systems demanding reliable combined-load performance.

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NSK 7209BW is a high-performance single-row angular contact ball bearing designed for combined radial and axial load conditions. Engineered with a 40° contact angle and precision manufacturing, it delivers high rigidity, low friction, and stable high-speed operation—ideal for precision machinery, automotive transmissions, and industrial gear systems demanding reliable combined-load performance.
1. Dimension Parameters (ISO 492 Standard)NSK
- Bore (d): 45 mm (tolerance: −0.006/+0 mm, P0/ABEC 1)
- Outer diameter (D): 85 mm (tolerance: 0/+0.019 mm)
- Width (B): 19 mm (tolerance: ±0.05 mm)NSK
- Chamfer (rmin): 1.1 mmNSK
- Weight: 0.433 kg
- Contact angle: 40°
- Dynamic load rating (Cr): 39.5 kN
- Static load rating (C0r): 28.8 kN
- Limiting speed (grease): 6,300 rpm; (oil): 8,000 rpm
- Clearance: CN (normal, ISO 5753)
2. Material Specification
- Inner/outer rings: SUJ2 (100Cr6/AISI 52100) bearing steel. Hardness: 60–64 HRC; high wear resistance, fatigue strength, and dimensional stability.
- Rolling balls: SUJ2 precision-grade steel. Hardness: 61–65 HRC; uniform load distribution and minimal friction.
- Cage: Pressed steel (SPCC). High rigidity, stable ball guidance, and resistance to deformation at high speeds.
3. Core Manufacturing Process
- Hot forging: Closed-die forging for refined grain structure and enhanced mechanical properties.
- CNC turning: Precision machining with dimensional accuracy ≤ ±0.003 mm.
- Heat treatment: Vacuum hardening + tempering for uniform hardness and minimal distortion.
- Grinding: Multi-stage precision grinding (raceway Ra ≤ 0.16 μm).
- Superfinishing: Raceway honing (Ra ≤ 0.05 μm) to reduce friction and improve lubricant retention.
- Automated assembly: Strict geometric and dynamic balancing for consistent performance.
4. Service Life
- Standard rating life (L10): 10,000–13,000 hours (ISO 281:2007; radial load 60% Cr, 1,800 rpm, clean grease).
- Key factors: Load level, lubrication quality, contamination, operating temperature (-20°C to +150°C), and alignment accuracy.
5. Applications & Industries
- Machine tools: Spindles, milling heads (high rigidity, precision).
- Automotive: Transmissions, differential gears (combined loads, high speed).
- Industrial gearboxes: Helical reducers, conveyor drives (heavy-duty, continuous operation).
- Pumps & compressors: Centrifugal pumps, air compressors (low vibration, long life).
- Material handling: Forklift lifts, conveyor pulleys (shock load resistance).
6. Maintenance & Lubrication
- Lubricant: NLGI 2 lithium complex grease (SKF LGMT3) or ISO VG 68–100 oil.
- Regreasing interval: 1,800–2,200 hours; 600 hours in harsh environments.
- Grease quantity: 7–8 g (30–35% of free internal space).
- Inspection: Every 600 hours; check noise, vibration, temperature (<75°C), and contamination.
7. Installation Guidelines
- Pre-installation: Clean shaft/housing; inspect for burrs, corrosion, and dimensional accuracy.
- Mounting: Induction heating (80–90°C) for inner ring; hydraulic press (max 50 kN) for outer ring; avoid direct impact.
- Alignment: Radial misalignment ≤ 0.002 mm/100 mm; axial runout ≤ 0.004 mm.
- Fastening: Lock nut torque: 55–65 Nm (grade 8.8 bolts).
- Post-installation: Manual rotation check; temperature rise <30°C above ambient; vibration test.

BRAND	FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI
BEARINGS NO.	7209BW NSK
TYPE	Angular Contact Ball Bearings
Inner(d)mm	45
Outer(D)mm	85
Width(B)mm	19
WEIGHT/KG	0.42
EAN CODE	0029176412585

Tel

+86-510-6831-3099

E-mail

fonkin-industries@188.com

Address

No.105, Huixin Road,Yuqi Industrial Park, Huishan District, hunqi Road, Yuqi Town, Wuxi, Jiangsu Province, P.R.CHINA

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