NSK 30303 D tapered roller bearing
- Brand
- NSK
- Category
- Bearings
- Subcategory
- Tapered roller bearings
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Decoding NSK 30303 D
- 303Series
- Tapered roller bearings, 303 series. Series differ in outside diameter and width even when the bore is the same.
- 03Bore
- Bore 17 mm: by standard, 03 designates 17 mm.
- DSuffix
- NSK suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
30303 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NSK 30303 D measures 17 mm across the bore and 47 mm across the outside diameter; its total width is 15.25 mm (17 x 47 x 15.25 mm).
NSK 30303 D 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 30303 D and any equivalents.
NSK D series tapered roller bearings are built to carry radial and axial loads together. Their tapered roller geometry distributes load evenly, which supports smooth running in industrial machinery, automotive systems, and transmission equipment. MR Industrial Accessories LLC supplies this series to customers throughout the United States and Latin America, and can help you confirm the right reference for your application.
The D suffix in this NSK series points to a design variation within the range, such as a specific cage style or contact angle. The main number identifies the size and dimension series. In references like 30303 D, 30304 D, 30332 D, 30334 D, 30336 D, and 30340 D, the D stays constant, so the series shares a common variant. Reading the code this way helps you match a bearing to the mounting and load case before you order.
These bearings appear in gearboxes, reducers, wheel hubs, machine tool spindles, and material handling equipment. They suit applications where the load direction changes or where radial and axial forces act at the same time. Maintenance teams use them in production lines, metalworking, food processing, mining, and agricultural machinery repair.
Selection depends on load magnitude and direction, operating speed, and the environment around the bearing. During installation, alignment and axial clearance adjustment matter; lock nuts or shims are common ways to set clearance. Grease or oil lubrication must match the temperature and speed of the application. Effective sealing keeps contaminants out and lubricant in, which supports bearing service life.
Tapered roller bearings from different manufacturers can often interchange when dimensions and design features align. Tolerances and load capacities may differ between brands, so verification is part of the process. NSK is one of the brands MR Industrial Accessories LLC supplies, and our team can review compatibility with other references before you commit to a replacement.
To request a quote, send the part number or size you need by WhatsApp or email. We reply promptly and can suggest equivalents or help you choose the right bearing for your equipment. MR Industrial Accessories LLC supplies bearings, mounted units, power transmission parts, seals, and maintenance tools, with manufacturing of split plummer block housings, roller chains, and sheaves.
Dimensions
17 x 47 x 15.25 mm (d x D x T): boundary dimensions for basic designation 30303, according to ISO 355.
- Bore
- 17mm
- Outside diameter (D)
- 47mm
- Total width (T)
- 15.25mm
SKF and other brands, same size
Other brands' pages with basic designation 30303: 17 x 47 x 15.25 mm (d x D x T) per ISO 355.
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
- NSK 30303 D bearing: what are its dimensions?
- NSK 30303 D measures 17 mm across the bore and 47 mm across the outside diameter; its total width is 15.25 mm (17 x 47 x 15.25 mm). Those are the boundary dimensions standardized in ISO 355 for basic designation 30303.
- What is the meaning of the D suffix in NSK bearings?
- In this series, the D suffix indicates a design variation, such as a cage style or contact angle. The main number covers size and dimension series. Send us the full part number and we can confirm the details for your application.
- How do I select the correct tapered roller bearing?
- Review radial and axial loads, speed, temperature, and the space available. Mounting type and lubrication also affect the choice. Our team can help you match a bearing to your equipment.
- Can NSK bearings replace bearings from other brands?
- Interchange is possible when dimensions and load capacity match, but tolerances and design features should be checked. If you provide another brand's part number, we can point you to an NSK equivalent or a compatible alternative.