The 6203ZZC3 KOYO is a double metal shielded deep groove ball bearing with C3 enlarged internal clearance, manufactured by KOYO for medium-speed, medium-load equipment prone to thermal expansion. Its ZZ dust shield structure blocks dry dust particles, while C3 clearance eliminates seizure risks under temperature rise, making it a cost-effective universal bearing for general industrial and automotive light-load rotating parts.
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The 6203ZZC3 KOYO is a double metal shielded deep groove ball bearing with C3 enlarged internal clearance, manufactured by KOYO for medium-speed, medium-load equipment prone to thermal expansion. Its ZZ dust shield structure blocks dry dust particles, while C3 clearance eliminates seizure risks under temperature rise, making it a cost-effective universal bearing for general industrial and automotive light-load rotating parts.
Dimensional parameters comply with ISO 681 standard: inner diameter 17 mm, outer diameter 40 mm, width 12 mm, chamfer 0.8×45°, tolerance class P6, radial clearance class C3, basic dynamic load rating 9.58 kN, static load rating 4.78 kN, unit weight 0.062 kg. Standard dimensions support interchangeable replacement with mainstream brand bearings.
Inner rings, outer rings and steel balls adopt vacuum refined 100Cr6 chrome bearing steel, quenched to HRC 60–62, featuring excellent wear resistance, contact fatigue strength and stable dimensional performance under temperature fluctuation.
The SPCC stamped steel cage evenly separates rolling elements to reduce vibration; cold-rolled steel ZZ shields offer reliable dustproof protection for dry workshop environments.
Core production processes include precision hot forging, CNC turning, controlled-atmosphere quenching and tempering, raceway grinding and superfinishing. Forging optimizes internal metal fiber flow; heat treatment removes residual stress; superfinishing lowers raceway surface roughness to cut friction and running noise.
Calculated per ISO 281 bearing life standard, the 6203ZZC3 KOYO delivers L10 rated service life of 54,000 hours under standard load, 3000 rpm and sufficient lubrication. Service life is affected by actual load, rotation speed, shaft alignment, lubrication condition and dust concentration.
This KOYO bearing is widely applied in small electric motors, motorcycle wheel hubs, agricultural auxiliary equipment, conveyor rollers, water pumps and household appliances. The C3 clearance design compensates thermal expansion for continuous high-speed operation, and double ZZ shields reduce maintenance frequency in dry dusty workshops.
Relubrication is required every 220 operating hours with NLGI 2 lithium-based general grease, filling quantity 0.3–0.5 g. Clean mating surfaces with lint-free cloth; inspect abnormal noise, temperature and shield deformation regularly, replace bearings once persistent wear appears.Before installation, clean shafts and housings and check H7/h6 fitting tolerance.
Use hydraulic press for press fitting, avoid hammer impact; control coaxiality deviation within 0.02 mm/m, tightening torque 12–16 N·m. Conduct no-load test run after assembly. Wear protective gloves to prevent surface scratches during operation.
| BRAND | FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI |
| BEARINGS NO. | 6203ZZC3 KOYO |
| TYPE | DEEP GROOVE BALL BEARING |
| Inner(d)mm | 17 |
| Outer(D)mm | 40 |
| Width(B)mm | 12 |
| WEIGHT/KG | 0.065 |
| EAN CODE | 6057900 281750 |
+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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