Bearing 6203

The 6203 bearing is a single-row ball bearing measuring 17 × 40 × 12 mm (internal diameter 17 mm, external diameter 40 mm, width 12 mm). We stock 24 variants, 14 of which are in stock for dispatch within 24 hours. Prices start at 30 Kč and vary depending on the manufacturer and variant.

Dimensions and interchangeability

The designation 6203 is an international standard (ISO 15), so a 6203 bearing from any manufacturer will always have the same dimensions of 17 × 40 × 12 mm and is mechanically interchangeable. They differ only in terms of seal design, clearance, precision and service life. When replacing a worn part, you can therefore choose a different brand to the one used in the original machine.

Variants we stock

• 6203 2RS – double-sided rubber seals – for dusty and damp environments
• 6203 2RSH – double-sided rubber seal (SKF designation)
• 6203 LLU – double-sided rubber seal (NTN designation)
• 6203 2Z – double-sided metal shield – lower friction, higher speeds
• 6203 ZZ – double-sided sheet metal cover (NTN designation)
• 6203 C3 – increased radial clearance – for higher temperatures and interference fits
• 6203 NR – groove including supplied retaining ring

Without a suffix, this is an open bearing without seals — the most economical option for clean and permanently lubricated mountings.

Manufacturers

For the 6203 designation, we offer SKF, FAG, NTN, ZVL, IBB, IBU, KG and CN brands. ZVL or IBB are sufficient for standard operation; for demanding and high-speed applications, we recommend SKF, FAG or NTN.

How to choose

The dimensions are the same for all 6203 bearings, so the environment is the deciding factor: 2RS sealed bearings for dusty and damp conditions, 2Z open bearings for clean and high-speed applications, and C3 clearance for heating or press-fitting. If you’re unsure, we can advise you based on the machine and the original part — tel: 270 003 620. You can find details on the marking system in the guide ‘How to choose a bearing’.