NF324EMC3 NSK

Cylindrical Roller Bearing NF324EMC3 NSK

NSK NF324EMC3 is a high-performance single-row cylindrical roller bearing from NSK’s EM series, featuring an NF-type separable structure, one-way axial load capability, and C3 radial clearance. Engineered with enhanced load capacity and a precision brass cage, it delivers exceptional radial rigidity, low friction, and extended service life for heavy-duty industrial machinery, transmissions, and large rotating equipment operating under continuous high loads.

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NSK NF324EMC3 is a high-performance single-row cylindrical roller bearing from NSK’s EM series, featuring an NF-type separable structure, one-way axial load capability, and C3 radial clearance. Engineered with enhanced load capacity and a precision brass cage, it delivers exceptional radial rigidity, low friction, and extended service life for heavy-duty industrial machinery, transmissions, and large rotating equipment operating under continuous high loads.
1. Dimension Parameters (ISO 492 & JIS B 1521 Standard)
- Bore (d): 120 mm (tolerance: −0.013/+0 mm, ISO P0/ABEC 1)
- Outer diameter (D): 260 mm (tolerance: 0/+0.025 mm)
- Width (B): 55 mm (tolerance: ±0.06 mm)
- Chamfer (r/r₁ min): 3 mm
- Weight: 15.0 kg
- Dynamic load rating (Cr): 450 kN
- Static load rating (C0r): 510 kN
- Limiting speed (grease): 2,200 rpm; (oil): 2,800 rpm
- Radial clearance (C3): 0.018–0.030 mm
- Structure: NF-type (single-row, outer ring double-ribbed, inner ring single-ribbed)
- Precision class: ISO P0 (standard precision)
2. Material Specification
- Inner/outer rings & rollers: SUJ2 (GCr15/100Cr6/AISI 52100) high-carbon chromium bearing steel. Hardness: 60–64 HRC; superior rolling fatigue strength, wear resistance, and dimensional stability under heavy radial loads.
- Cage: High-strength cast brass (CuZn25Al5) (EM design). One-piece, roller-guided construction with optimized pocket geometry for high-speed stability, low noise, and exceptional rigidity.
- Surface: Black oxide anti-corrosion treatment for enhanced rust protection in industrial environments.
3. Core Manufacturing Process
- Precision hot forging: Controlled grain flow for maximum load-bearing integrity and impact resistance.
- CNC turning: Dimensional accuracy ≤ ±0.005 mm, ensuring strict geometric conformity.
- Vacuum heat treatment: Uniform martensitic structure, minimal distortion, and consistent hardness distribution.
- Profile grinding: Log-convex roller & raceway profiling (Ra ≤ 0.16 μm) to reduce stress concentration.
- Superfinishing: Honing process (Ra ≤ 0.05 μm) for ultra-smooth contact surfaces, minimizing friction and wear.
- Automated assembly: 100% dimensional, clearance, and noise inspection complying with NSK quality standards.
4. Service Life
- Standard rating life (L10): 6,000–8,000 hours (ISO 281:2007; 70% Cr radial load, 1,000 rpm, clean NLGI 2 EP grease).
- Key influencing factors: Lubrication contamination, operating temperature (-30°C to +120°C), mounting alignment, shaft hardness (≥58 HRC), and axial preload adjustment.
5. Applications & Industries
- Industrial gearboxes: Heavy-duty speed reducers, conveyor drives (high radial load capacity, rigidity).
- Machine tools: Large milling machines, lathe spindles, boring mills (precision radial support, axial location).
- Construction machinery: Excavator travel reducers, crane hoist mechanisms (shock load resistance).
- Mining equipment: Crushers, vibrating screens, conveyor pulleys (durability in dusty, high-load conditions).
- Railway & automotive: Locomotive traction motors, truck transmission shafts (high-speed stability, long life).
6. Maintenance & Lubrication
- Lubricant: NSK LG2 lithium complex grease (NLGI 2) or ISO VG 150–220 extreme-pressure gear oil.
- Regreasing interval: 800–1,000 hours; 400 hours in heavy dust/moisture.
- Grease quantity: 75–85 g (30–35% of internal free space).
- Inspection: Every 500 hours; check operating temperature (<90°C), noise, vibration, and lubricant leakage.
7. Installation Guidelines
- Pre-installation: Clean shaft/housing to Ra ≤ 1.6 μm; inspect for burrs, corrosion, and dimensional accuracy.
- Mounting: Hydraulic press (max 250 kN) or induction heating (80–100°C); separate inner/outer ring installation.
- Alignment: Angular misalignment ≤ 2′ (0.033°); radial runout ≤ 0.008 mm.
- Fastening: Lock nut torque: 220–240 Nm (grade 8.8 bolts); axial preload per NSK standard.
- Post-installation: Manual rotation check; temperature rise <40°C above ambient; vibration testing.
BRAND INA/FONKIN/SKF/FAG/NSK/NTN/TIMKEN/ZKL/PEP/KOYO/TSUBAKI
BEARINGS NO. NF324EMC3 NSK
TYPE Cylindrical Roller Bearing Single Row
Inner(d)mm 120
Outer(D)mm 260
Width(B)mm 55
WEIGHT/KG 15.32
EAN CODE
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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BRAND	INA/FONKIN/SKF/FAG/NSK/NTN/TIMKEN/ZKL/PEP/KOYO/TSUBAKI
BEARINGS NO.	NF324EMC3 NSK
TYPE	Cylindrical Roller Bearing Single Row
Inner(d)mm	120
Outer(D)mm	260
Width(B)mm	55
WEIGHT/KG	15.32
EAN CODE

Cylindrical Roller Bearing NF324EMC3 NSK

1. Dimension Parameters (ISO 492 & JIS B 1521 Standard)

2. Material Specification

3. Core Manufacturing Process

4. Service Life

5. Applications & Industries

6. Maintenance & Lubrication

7. Installation Guidelines

Tel

E-mail

Address

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