6205 Bearing Size: 6205 ZZ vs 6205 2RS E & 6305 Upgrade Guide
A standard 6205 bearing size measures 25 mm bore x 52 mm outer diameter x 15 mm width. Identical boundary dimensions are shared across open designs and sealed options like the 6205 ZZ metal-shielded and 6205 2RS E contact-sealed variants. While standard boundary sizes follow strict international ISO patterns[1], matching dimensions alone do not guarantee that every 6205 bearing is interchangeable across different operating environments.
Selecting the correct 6205 part number requires looking beyond external dimensions to examine seal type, environmental hazards, and total dynamic load requirements. Choosing between a non-contact metal shield and a rubber contact seal dictates contamination resistance, while stepping up to a 6305 series bearing offers higher radial capacity on the same shaft size.
This guide breaks down exact boundary dimensions for 6205, 6305, and 6206 bearings, explains when to specify 6205 ZZ versus 6205 2RS E, and details when your application requires a heavy-series step-up.
What are the exact dimensions of a 6205 bearing?
A standard 6205 bearing features a 25 mm bore, 52 mm outer diameter, and 15 mm width across both 6205 ZZ and 6205 2RS E variants. In the ISO bearing boundary dimension system[1], the final digits "05" specify the 25 mm inner diameter (5 x 5 mm), while the leading "62" designates a light-series single-row deep groove ball structure.
A common misconception among maintenance engineers and procurement buyers in Pakistan is that all bearings sharing a bore size or series number are identical. Comparing the 6205 against adjacent popular part numbers illustrates how boundary envelope dimensions shift dramatically:
| Part Number | Bore (ID) | Outer Diameter (OD) | Width (B) | Bearing Series |
|---|---|---|---|---|
| 6205 | 25 mm | 52 mm | 15 mm | 6200 Light Series |
| 6305 | 25 mm | 62 mm | 17 mm | 6300 Medium Series |
| 6206 | 30 mm | 62 mm | 16 mm | 6200 Light Series |
While sharing a 25 mm bore with the 6205, the heavier 6305 bearing steps up to a 62 mm outer diameter and 17 mm width for higher load capacities. Conversely, the 6206 bearing increases bore size to 30 mm while matching the 62 mm outer diameter of the 6305, but maintaining a 16 mm width. Each part number defines a distinct shaft fit and housing envelope. Verify your physical space before selecting a replacement 6205 bearing.
Parts in this article
| Part (bore x OD x width) | Variants | Price |
|---|---|---|
| 6205 25 x 52 x 15 mm 6200 Series | 6205 2RS E (2x Rubber Seal) · Low stock 6205 ZZ (2x Shield) · In stock | Ask today's price on WhatsApp |
| 6206 30 x 62 x 16 mm 6200 Series | 6206 2RS (2x Rubber Seal) · Low stock 6206 2RS E (2x Rubber Seal) 6206 ZZ (2x Shield) | Ask today's price on WhatsApp |
What is the difference between 6205 ZZ and 6205 2RS E bearings?
Bearings with matching dimensions are not automatically interchangeable, as variant suffixes dictate sealing performance and environmental protection. The main difference between the 6205 ZZ and 6205 2RS E lies in enclosure design: metal shields versus synthetic rubber contact seals[1].
- 6205 ZZ (2x Shield): Features dual non-contact steel dust shields pressed into the outer ring. Because the shields do not make direct contact with the inner ring, the bearing operates with minimal running friction and low heat generation, making it ideal for high-speed, dry applications such as electric motors and clean machinery drives.
- 6205 2RS E (2x Rubber Seal): Incorporates dual lip-contact synthetic rubber seals bonded to steel inserts. The rubber lips press directly against the inner ring shoulder, creating a physical barrier against dust, moisture, and washdown liquids. The "E" designation signifies an optimized internal engineering design for enhanced durability.
| Criteria | 6205 ZZ (Metal Shield) | 6205 2RS E (Rubber Seal) |
|---|---|---|
| Contact Type | Non-contact steel shield | Direct-contact rubber lip |
| Friction & Torque | Low friction, lower torque | Higher contact drag torque |
| Contamination Defense | Prevents dry particle entry | Blocks fine dust, water, slurry |
| Grease Retention | Standard factory fill | Superior seal against washout |
| Target Environment | Clean, enclosed, high-speed | Harsh, exposed, humid, dirty |
Using a metal-shielded 6205 ZZ in a dusty agricultural pump leads to premature failure as fine particles penetrate the shield gap. Conversely, specifying a contact rubber seal ensures maximum service life under severe exposure.
When should I step up from a 6205 to a 6305 bearing?
You should step up from a 6205 to a 6305 bearing when your machine design demands significantly higher radial dynamic and static load ratings while retaining the exact same 25 mm shaft diameter. Standard deep groove ball bearings are rated for specific fatigue life cycles[1], and increasing the rolling element diameter provides a substantial increase in load capacity.
The 6205 belongs to the 6200 light series, whereas the 6305 belongs to the 6300 medium series. Moving to the 6305 expands the outside diameter from 52 mm to 62 mm (a 10 mm increase) and the width from 15 mm to 17 mm (a 2 mm increase). This larger envelope houses larger steel balls and thicker race walls, allowing the bearing to absorb heavy shock loads, belt tension, and severe overhung forces that would deform or fatigue a standard 6205.
Step up to a 6305 bearing during equipment upgrades, high-horsepower electric motor rebuilds, or heavy industrial gearbox overhauls where housing bore space permits the 62 mm outer diameter. HI-TEC Bearings provides technical verification, supplying both standard HI-TEC and premium HI-TEC SILVER tiers for industrial applications across Pakistan. Send your exact part number requirements directly to our technical team via WhatsApp (+92-348-5563390) for immediate pricing and stock confirmation.
Need a price? Ask HI-TEC BEARINGS on WhatsApp Send the part number (6205, 6206, or any other) to ask for today's price and availability. Open WhatsApp |
Frequently Asked Questions
What are the exact dimensions of a 6205 bearing?
A standard 6205 deep groove ball bearing measures exactly 25 mm inner diameter (bore), 52 mm outer diameter, and 15 mm width across both metal-shielded (ZZ) and rubber-sealed (2RS E) variants.
What is the difference between 6205 ZZ and 6205 2RS E bearings?
The 6205 ZZ features dual non-contact metal shields for low-friction, high-speed operation in dry environments. The 6205 2RS E uses direct-contact rubber lip seals to exclude dust, dirt, and moisture in harsh conditions.
Are all 6205 bearings interchangeable?
No, 6205 bearings are not universally interchangeable. While boundary dimensions (25x52x15 mm) match across standard units, variations in sealing (ZZ vs 2RS E), internal radial clearance, and quality tiers determine suitability for specific operational environments.
When should I step up from a 6205 to a 6305 bearing?
Step up to a 6305 bearing when your application requires greater load-carrying capacity on a 25 mm shaft and the housing can accommodate an increased 62 mm outer diameter and 17 mm width.
References
- 6205 - Deep groove ball bearings. https://www.skf.com/us/products/rolling-bearings/ball-bearings/deep-groove-ball-bearings/productid-6205 (2026-10-24)