Quick answer
6205 2RS and 6205 ZZ share a 25 × 52 × 15 mm reference envelope, but the named JTEKT configurations use contact seals and shields respectively. Select the complete variant against contamination, lubrication, temperature and speed requirements; matching dimensions alone does not approve a replacement.
A 6205 purchase order can look complete while leaving a critical choice open: the closure. Two bearings may fit the same shaft and housing, yet require different decisions about contamination, grease and operating speed. Treat the suffix as part of the specification, rather than an optional note after the model number.
What are the dimensions of a 6205 bearing?
The JTEKT / Koyo reference records for 6205 2RS and 6205 ZZ both list a 25 mm bore, 52 mm outside diameter and 15 mm width. These boundary dimensions identify the space occupied by the bearing. They do not establish identical sealing, grease, clearance or operating limits.
| Item | 6205 2RS | 6205 ZZ |
|---|---|---|
| Reference closure | Contact sealed | Shielded |
| Bore × outside × width | 25 × 52 × 15 mm | 25 × 52 × 15 mm |
| Published grease speed limit | 8,400 min⁻¹ | 13,000 min⁻¹ |
The classifications, dimensions and speed figures above come from the JTEKT 6205 2RS record and JTEKT 6205 ZZ record. They illustrate a configuration difference; they are not SANJ speed ratings or a universal limit for every supplier.
How should buyers compare seals and shields?
Start with the environment at the bearing position. Record whether dust, moisture or process fluid can reach it, and whether the machine already has external protection. Then ask the supplier to identify the proposed closure design and its suitability for those conditions. A two-sided contact seal is not, by itself, an equipment waterproof rating.
Keep the lubrication question separate. Specify the lubricant, temperature range, compatibility requirements and maintenance plan. Do not assume a sealed or shielded bearing can be serviced in the same way as an open bearing. For terminology across brands, use the bearing seal and shield guide and ask for the manufacturer’s designation key.
Why should the full designation come before a speed decision?
The two published limits in the comparison table show why a base model alone is insufficient. Your operating speed still needs to be checked against the exact proposed bearing, lubrication and duty. A catalog limit is not an instruction to run continuously at that value, and a lower machine speed does not resolve every selection question.
Provide the normal and maximum speed, run duration, starts and stops, measured or expected temperature, and load information with the enquiry. Request the supplier’s confirmation for the full configuration. Compare alternatives against the same brief so that a closure change is visible in both the quotation and the approved specification.
What should a 6205 2RS or ZZ enquiry include?
- Identification: existing full designation, manufacturer, drawing revision and the 25 × 52 × 15 mm envelope.
- Configuration: required closure, material, clearance, accuracy and lubricant, including any options that remain undecided.
- Duty: radial and axial loads, speed range, operating temperature, contamination and the shaft/housing arrangement.
- Supply: quantity, destination, packing and required inspection or documentation.
For a replacement, retain a photograph of the original marking and the equipment drawing. If the old bearing is damaged or the marking is incomplete, state what is known rather than guessing the missing suffix. An equivalent-looking photograph cannot confirm an equivalent specification.
Common 6205 seal and shield questions
Can I replace 6205 ZZ with 6205 2RS?
Matching dimensions is only the first check. Have the responsible engineer or supplier confirm the closure, lubrication, speed, temperature and complete replacement requirement before changing the specification.
Does 2RS mean the bearing is waterproof?
Do not interpret the suffix as a complete equipment ingress-protection claim. Ask for the exact seal design and the supplier’s stated operating conditions.
Are suffixes identical across bearing brands?
Check each manufacturer’s designation system. Quote the full original designation and the requested performance rather than approving a substitution from similar letters alone.
Compare the model and prepare a quotation
Use the 6205 reference specification page for dimensions and its identified source. Browse deep groove ball bearings, or send SANJ a 6205 enquiry with the closure and operating brief. The requested SANJ variant is established through the confirmed quotation and datasheet.
