FONKIN QJ4580ZV is a single-row four-point contact ball bearing engineered for automotive steering systems, featuring a flanged outer ring (ZV) and optimized internal geometry. Designed to support combined radial and bidirectional axial loads, it delivers exceptional rigidity, low friction, and high precision—ideal for electric steering racks, gearboxes, and heavy-duty automotive applications requiring stable axial positioning and long service life.
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FONKIN QJ4580ZV is a single-row four-point contact ball bearing engineered for automotive steering systems, featuring a flanged outer ring (ZV) and optimized internal geometry. Designed to support combined radial and bidirectional axial loads, it delivers exceptional rigidity, low friction, and high precision—ideal for electric steering racks, gearboxes, and heavy-duty automotive applications requiring stable axial positioning and long service life.
Bore (d): 45 mm (tolerance: −0.008/+0 mm, ISO P6/ABEC 3)
Outer diameter (D): 84 mm (tolerance: 0/+0.015 mm)
Width (B): 20 mm (tolerance: ±0.04 mm)
Flange diameter: 92 mm; Chamfer (rmin): 1.2 mm
Weight: 0.40 kg
Dynamic load rating (Cr): 42.5 kN; Static load rating (C0r): 53.2 kN
Limiting speed (grease): 5,000 rpm; (oil): 6,500 rpm
Internal clearance: C3 (radial clearance: 0.013–0.023 mm)
Precision class: ISO P6 (high precision)
Structure: Four-point contact, single-row, flanged outer ring (ZV)
Inner/outer rings: GCr15 (SUJ2/100Cr6/AISI 52100) bearing steel. Hardness: 60–64 HRC; high rolling fatigue strength, wear resistance, and dimensional stability.
Rolling balls: GCr15 high-precision steel (φ6.0 mm). Hardness: 61–65 HRC; uniform load distribution and minimal friction.
Cage: Pressed steel (SPCC). Optimized pocket design for stable ball guidance, low noise, and high-speed compatibility.
Surface: Phosphating anti-corrosion treatment for enhanced rust protection in automotive environments.
Precision hot forging: Refined grain structure for maximum load-bearing integrity.
CNC turning: Dimensional accuracy ≤ ±0.003 mm for strict geometric conformity.
Vacuum heat treatment: Uniform martensitic structure, minimal distortion, consistent hardness distribution.
Profile grinding: Raceway roughness Ra ≤ 0.15 μm; four-point contact geometry optimization.
Superfinishing: Honing process (Ra ≤ 0.05 μm) for ultra-smooth contact surfaces, reducing friction and wear.
Automated assembly: 100% noise/vibration and clearance inspection complying with ISO P6 standards.
Standard rating life (L10): 9,000–11,000 hours (ISO 281:2007; 65% Cr radial load, 1,800 rpm, clean NLGI 2 EP grease).
Key factors: Lubrication contamination, operating temperature (-30°C to +120°C), mounting alignment, shaft hardness (≥58 HRC), and axial preload adjustment.
Automotive steering: Electric/hydraulic steering racks (Ford, Cadillac, BMW), steering gearboxes (bidirectional axial load support).
Automotive transmission: Gearbox input/output shafts, differential assemblies (combined load capacity).
Industrial automation: Precision actuators, servo mechanisms (high rigidity, axial stability).
Heavy-duty vehicles: Truck steering systems, construction machinery steering gears (shock load resistance).
Agricultural machinery: Tractor steering assemblies (durability in dusty conditions).
Lubricant: FONKIN LG3 lithium complex grease (NLGI 2) or ISO VG 46–68 EP mineral oil.
Regreasing interval: 1,500–2,000 hours; 800 hours in heavy dust/moisture.
Grease quantity: 3.5–4.0 g (35–40% of internal free space).
Inspection: Every 800 hours; check operating temperature (<80°C), noise, vibration, and lubricant leakage.
Pre-installation: Clean shaft/housing to Ra ≤ 1.6 μm; inspect for burrs, corrosion, and dimensional accuracy.
Mounting: Hydraulic press (max 40 kN) or induction heating (70–80°C); avoid direct impact on flange.
Alignment: Angular misalignment ≤ 3′ (0.05°); axial runout ≤ 0.003 mm.
Fastening: Flange bolts torque: 25–30 Nm (grade 8.8 bolts); uniform tightening sequence.
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. | QJ4580ZV FONKIN |
| TYPE | Angular Contact Ball Bearings |
| Inner(d)mm | 45 |
| Outer(D)mm | 84 |
| Width(B)mm | 20 |
| WEIGHT/KG | 0.36 |
| 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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