Housing and Bearing (assembly) UC205 SKF

The UC205 SKF is a widely‑used precision insert ball bearing with a set screw locking design, specially developed for universal industrial mounting units. Featuring double‑sided rubber seals and integrated inner ring extension, it delivers easy installation, reliable locking, dustproof performance and stable light‑to‑medium load operation, making it a staple component for general‑purpose mechanical transmission systems.

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The UC205 SKF is a widely‑used precision insert ball bearing with a set screw locking design, specially developed for universal industrial mounting units. Featuring double‑sided rubber seals and integrated inner ring extension, it delivers easy installation, reliable locking, dustproof performance and stable light‑to‑medium load operation, making it a staple component for general‑purpose mechanical transmission systems.
Complying with ISO standard dimensions, its key parameters are: bore diameter 25 mm, outer diameter 52 mm, overall width 34.1 mm, chamfer 1.0×45°, tolerance class P6, standard radial clearance C3. The extended inner ring with two set‑screw holes enables direct shaft locking without additional fasteners.
Inner rings, outer rings and rolling balls are made of high‑purity 100Cr6 vacuum‑refined bearing steel, quenched to HRC 61–63 with excellent wear resistance, fatigue strength and corrosion resistance. The pressed steel cage ensures stable ball guidance under continuous rotation. Double‑lip NBR rubber seals block dust, moisture and debris effectively for long‑term protection.
Core manufacturing processes include precision forging, CNC turning, vacuum heat treatment, raceway grinding and superfinishing. Optimized forging improves metal fiber continuity; low‑temperature tempering reduces residual stress; superfinishing minimizes surface roughness, lowering friction and improving running stability.
Based on the ISO 281 life standard, the UC205 SKF achieves a rated L10 service life of 55 000 hours under standard load, moderate speed and proper lubrication. Main influencing factors include load size, rotational speed, sealing performance, shaft alignment and lubrication condition.
This insert bearing is extensively applied in agricultural machinery, conveyor systems, textile equipment, packaging machines, small‑size fans and general industrial machinery. Its set‑screw locking structure simplifies installation and disassembly, suitable for non‑precision positioning and frequent maintenance scenarios.
For routine maintenance, re‑lubricate every 250 operating hours with lithium‑based NLGI 2 grease, with filling quantity 0.4–0.6 g. Keep seal surfaces clean; regularly check noise, temperature and locking tightness, replacing seals upon aging or damage.
Before installation, clean the shaft surface and check dimensional tolerance H7/h6. Mount the bearing onto the shaft, tighten set‑screws with torque 18–22 N·m, control coaxiality within 0.02 mm/m. Perform no‑load test run after assembly to ensure smooth rotation without abnormal vibration.

BRAND	FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI
BEARINGS NO.	UC205 SKF
TYPE	Housing and Bearing (assembly)
Inner(d)mm	25
Outer(D)mm	52
Width(B)mm	34.1
WEIGHT/KG	0.192
EAN CODE	7316577 030061

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