2308 Self-aligning Ball Bearings

2308 Self-Aligning Ball Bearing / 2308K | Bearing Steel And Stainless Steel

The 2308 self-aligning ball bearing is a high-performance double-row rolling bearing with a spherical outer raceway, designed for stable medium-duty industrial operation. It features outstanding self-aligning ability to compensate shaft misalignment and installation deflection, delivering low-friction, low-noise and smooth rotation. Available in standard straight bore 2308, tapered bore 2308K, bearing steel and stainless steel grades, this bearing runs reliably in dry, humid and sanitary working environments.

Difference Between 2308 and 2308K

2308 (Standard Bore): Adopts a straight cylindrical inner bore for fixed shaft fitting. It supports simple installation, stable positioning and easy disassembly, suitable for medium-load machinery with fixed assembly and no frequent adjustment requirements.

2308K (Tapered Bore): Equipped with a 1:12 standard tapered inner bore, compatible with universal adapter sleeves. It enables flexible mounting and precise clearance adjustment for easy maintenance and calibration, ideal for variable-speed transmission and frequently adjusted industrial equipment.

Material Differences: Bearing Steel vs Stainless Steel

Bearing Steel (GCr15): GCr15 bearing steel is the cost-effective standard material for 2308 and 2308K bearings. Professional heat treatment provides high hardness, excellent wear resistance and strong anti-fatigue performance. It maintains stable load capacity and smooth operation under conventional dry conditions, perfect for general medium-duty industrial machinery and transmission systems.

Stainless Steel: Stainless steel 2308/2308K bearings deliver superior rust-proof, oxidation and weak corrosion resistance. They effectively resist moisture, humid air and minor contamination to prevent precision loss and corrosion failure, making them ideal for damp, clean, sanitary and mild outdoor working scenarios.

Product Features

Reliable self-aligning capability offsets mounting errors and shaft deflection. Double-row ball structure ensures stable medium-load capacity with low-noise, smooth operation. Dual bore designs meet fixed and adjustable installation demands. Two material grades balance cost performance and anti-corrosion ability. Standard size enables quick installation and long service life.

Application Scenarios

2308 and 2308K self-aligning ball bearings are widely used in medium-sized motors, industrial fans, textile machinery, conveyor systems and industrial automation equipment. Bearing steel models suit conventional indoor mechanical devices; stainless steel versions fit food processing machinery, medical equipment and high-humidity environment machinery. 2308K tapered bore bearings are optimal for equipment requiring frequent debugging and routine maintenance.