The 63/28 2RS C3 is a high-performance non-standard deep groove ball bearing engineered for OEM replacement and hard-to-find bearing scenarios. This size is frequently obsolete and discontinued in global standard distributor inventories, making it a critical solution for legacy industrial equipment, agricultural machinery, and precision motor assemblies.

With precise custom dimensions of 28×68×18 mm (1.102×2.677×0.709 in), a double-lip 2RS seal design, and C3 internal clearance, this unit eliminates the need for costly shaft grinding or housing modifications. It delivers stable, long-lasting performance in high-vibration, high-temperature, and dusty industrial environments where standard bearings fail repeatedly.

Technical Specifications

Key Features & Benefits

✅ Exact OEM Dimensional MatchFully replicates the original 28×68×18 mm non-standard size, ensuring a true drop-in replacement without mechanical modification to shafts or housings.

✅ 2RS Double-Lip SealingProtects internal components from dust, moisture, and contaminants, while preventing grease leakage—ideal for harsh industrial and agricultural environments.

✅ C3 Increased ClearanceAccommodates thermal expansion and high operating temperatures, reducing friction and preventing premature failure in high-heat applications.

✅ Custom Material OptionsAvailable in standard GCr15 chrome steel for general industrial use, or SUS440C/SUS304 stainless steel for corrosion-resistant food, pharmaceutical, or marine applications.

✅ Obsolete Size SolutionAddresses the critical shortage of discontinued 63/28 2RS C3 bearings in standard catalogs, minimizing unplanned equipment downtime.

✅ High Load CapacityDeep groove geometry supports both radial and moderate axial loads, making it suitable for heavy-duty motors, pumps, and transmission assemblies.

Typical Applications

The 63/28 2RS C3 bearing is widely used in:

• Legacy Industrial Motors & Pumps: Discontinued OEM equipment where standard sizes no longer fit

• Agricultural Machinery: Tractors, harvesters, and irrigation systems operating in dusty, high-vibration conditions

• Automotive & Heavy Equipment: Transmission assemblies and off-road vehicle components

• Food Processing Equipment: Stainless steel variants meet hygiene standards for cleanroom operations

• Precision Industrial Gearboxes: High-load, high-temperature industrial transmission systems

Why Standard Bearings Fail Here

Standard 63-series bearings (e.g., 6305, 6306) have fixed dimensions that do not match the 28×68×18 mm non-standard cavity of OEM legacy equipment. Forcing a standard bearing into this size causes:

• Shaft slippage or over-preload due to incorrect bore fit

• Uneven load distribution from mismatched outer diameter

• Axial instability from incorrect width, leading to vibration and fatigue failure

• Premature wear from incompatible clearance and sealing

These issues result in repeated equipment breakdowns and costly downtime—the 63/28 2RS C3 eliminates all these problems with a perfect dimensional match.

Cross-Reference & Interchangeability

This 28×68×18 mm non-standard size corresponds to bearings previously supplied under various international brand naming conventions using 63/28-series 2RS C3 designations, many of which are now obsolete or discontinued in standard catalogs.

If you have a sample, drawing, worn part with faded markings, or an OEM part number, our engineering team can measure and verify the exact dimensions and confirm compatibility with your equipment before you order.

Customization Options

We offer full customization to meet your specific application requirements:

• Material: Chrome steel (standard), SUS440C, SUS304, or hybrid ceramic

• Seal Type: 2RS (rubber), ZZ (metal shield), or open (for high-speed applications)

• Clearance: C2, C3, C4, or custom clearance for extreme operating conditions

• Precision: ABEC-1, ABEC-3, ABEC-5 (for high-precision applications)

• Lubrication: Custom grease options for high-temperature, food-grade, or low-noise requirements

Frequently Asked Questions (FAQs)

Q: Is the 63/28 2RS C3 a standard size?

A: No, it is a non-standard special dimension bearing, often discontinued in global standard catalogs. EKB specializes in manufacturing this exact size for OEM replacement.

Q: What does "C3 clearance" mean?

A: C3 clearance is an increased radial clearance that accommodates thermal expansion and high operating temperatures, reducing friction and preventing bearing seizure in high-heat environments.

Q: Can I use a standard 6306 bearing as a replacement?

A: No. The 6306 has dimensions of 30×72×19 mm, which does not match the 28×68×18 mm cavity. Forcing it will cause premature wear, vibration, and significantly shortened service life.

Q: What is the lead time for custom orders?

A: Standard samples are available in 7–10 days; mass production lead time is 15–25 days, depending on order quantity and customization requirements.

Q: Do you offer stainless steel versions?

A: Yes. We can manufacture the 63/28 2RS C3 in SUS440C (high hardness) or SUS304 (corrosion-resistant) stainless steel for food, pharmaceutical, or marine applications.

Call to Action

If you are struggling to find a replacement for your obsolete 63/28 2RS C3 bearing, contact our engineering team today. We can:

• Verify your bearing dimensions from a sample, drawing, or part number

• Provide a free cross-reference and compatibility check

• Deliver a custom-manufactured replacement in as little as 7 days

• Minimize unplanned downtime and avoid costly equipment modifications