
RKB 30204 tapered roller bearing
- Brand
- RKB
- Category
- Bearings
- Subcategory
- Tapered roller bearings
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Tell us the quantity you need and request a quote by WhatsApp or email.
Other brands for this category
Ask us for alternatives. We check every equivalent against the part number and your application.
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Decoding RKB 30204
- 302Series
- Tapered roller bearings, 302 series. Series differ in outside diameter and width even when the bore is the same.
- 04Bore
- Bore 20 mm (04 × 5).
30204 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
RKB 30204 measures 20 mm across the bore and 47 mm across the outside diameter; its total width is 15.25 mm (20 x 47 x 15.25 mm).
RKB 30204 belongs to tapered roller bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 30204 and any equivalents.
For operations that combine radial and axial forces in one bearing position, RKB tapered roller bearings are a practical choice. The tapered geometry of races and rollers creates linear contact, which distributes the load across the assembly. Gearboxes, wheel axles and industrial machinery are typical homes for these bearings, where rigidity and precision matter. MR Industrial Accessories LLC supplies them and can help you match the right reference to your application.
Reading the part number helps you narrow down the options. In the 320 series, a designation like 320/22 or 320/28 tells you the bore size in millimeters—22 mm and 28 mm respectively—while the series number reflects the section and capacity. The 322 series, for instance 322/28, offers a higher capacity. Other references such as 255-417054 or 418/414 combine cone and cup numbers for specific assemblies. If you need to confirm which series fits your shaft, send the code over and our team will review it.
These bearings appear in automotive, metallurgical, food processing and mining environments. You will find them in gearboxes, reducers, transmission shafts, conveyor rollers and agricultural equipment. Their ability to handle combined loads and their stiffness suit applications with tilting moments, including earthmoving and oil industry machinery.
Selection depends on the radial and axial load, the speed and the conditions on site. During mounting, alignment must be precise and axial clearance set correctly using nuts, washers or shims. Grease or oil lubrication is chosen according to the application. Sealing is critical to keep contaminants out, so radial shaft seals or labyrinth seals are recommended. Proper installation supports a longer bearing service life.
Interchange between brands is possible when dimensions and load capacity align. Tolerances and contact angle can differ from one manufacturer to another, so those points deserve a check. If you have a part number from another brand, we can point you to a compatible option. Reviewing the technical data before replacing a bearing is always a good practice.
To request a quote for RKB tapered roller bearings, send the part number or the measurements you need by WhatsApp or email. Our team replies promptly and can also advise on installation and maintenance.
Dimensions
20 x 47 x 15.25 mm (d x D x T): boundary dimensions for basic designation 30204, according to ISO 355.
- Bore
- 20mm
- Outside diameter (D)
- 47mm
- Total width (T)
- 15.25mm
SKF and other brands, same size
Other brands' pages with basic designation 30204: 20 x 47 x 15.25 mm (d x D x T) per ISO 355.
- Need the SKF 30204? We can also quote:30204 J2/Q30204/VA983
- FAG30204-XL
- TIMKEN30204
What they share are the ISO 355 boundary dimensions, not the specs: seals or shields, internal clearance, cage and load rating may vary with brand and suffix. Every quote is by full part number.
Frequently asked questions
- RKB 30204 bearing: what are its dimensions?
- RKB 30204 measures 20 mm across the bore and 47 mm across the outside diameter; its total width is 15.25 mm (20 x 47 x 15.25 mm). Those are the boundary dimensions standardized in ISO 355 for basic designation 30204.
- What does the designation 320/28 mean?
- It identifies a tapered roller bearing in the 320 series with a 28 mm bore. The series number indicates the section and load capacity. Ask us on WhatsApp for more details.
- How is a tapered roller bearing mounted?
- Align the shaft and housing, then set the axial clearance with nuts or shims. Lubricate as specified and check the sealing to keep contaminants out. Poor mounting can shorten bearing life.
- Can I replace a bearing from another brand with an RKB one?
- Yes, if dimensions and load capacity match. Check tolerances and contact angle, as they may vary. Send us the original part number by WhatsApp or email and we will help you find the right equivalent and quote it.

