Description
Reviews
| Brand | - |
| Category | Industrial Small Parts / Bearings & Bushings |
| Origin | - |
| Brand | NSK |
| Part Number | 61904 / 6904 |
| Bore Diameter | 20 mm |
| Outer Diameter | 37 mm |
| Width | 9 mm |
| Material | High Carbon Chrome Steel |
| Seal Type | ZZ (Metal Shield) or RS (Rubber Seal) |
| Clearance Class | C3 Available |
| Country of Origin | Japan |
| Precision Rating | ABEC-1 (ISO Class Normal) |
Anonymous
Apr 16, 2026
Rating: 5/5
Reliable Supplier
Third time ordering from this listing, never disappointed. Great for industrial machinery maintenance.
Anonymous
Mar 03, 2026
Rating: 5/5
Perfect Fit
Dimensions matched perfectly on my calipers. Inner race, outer race, and width are all within spec.
Anonymous
Feb 18, 2026
Rating: 5/5
Genuine Product
Exactly what I needed for my motor repair. The packaging indicated genuine NSK origin and the build quality is evident.
Anonymous
Feb 04, 2026
Rating: 4/5
Good but pricey
Quality is top notch but shipping took a while. The bearing itself fits perfectly and performs well.
Anonymous
Jan 30, 2026
Rating: 5/5
Smooth Operation
Runs very quietly compared to generic brands I have used in the past. Worth the extra cost for reliability.
Q: Is C3 clearance standard on this listing?
A: We offer both standard and C3 clearance, please select your preferred option from the variation menu.
Q: Does it come pre-lubricated?
A: Yes, all bearings are pre-lubricated with standard grease from the factory.
Q: Can I use this for 3000 RPM applications?
A: Yes, this size and type supports that speed easily under normal load conditions.
Q: Is this bearing made in Japan?
A: Yes, these are imported directly from NSK Japan facilities.
Q: What is the difference between ZZ and RS seals?
A: ZZ indicates metal shields on both sides, while RS indicates rubber contact seals for better contamination protection.
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