NTN 30318DU tapered roller bearing
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Tapered roller bearings
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Decoding NTN 30318DU
- 303Series
- Tapered roller bearings, 303 series. Series differ in outside diameter and width even when the bore is the same.
- 18Bore
- Bore 90 mm (18 × 5).
- DUSuffix
- NTN suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
30318 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NTN 30318DU measures 90 mm across the bore and 190 mm across the outside diameter; its total width is 46.5 mm (90 x 190 x 46.5 mm).
NTN 30318DU 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 30318DU and any equivalents.
Tapered roller bearings in the NTN DU series are built to carry radial and axial loads at the same time, in a single direction. The tapered raceways and guided rollers create linear contact, so the load spreads across the rolling surface rather than concentrating at a point. Typical uses include gear reducers, transmission cases, wheel hubs and motion equipment, where combined forces call for a rigid bearing arrangement. MR Industrial Accessories LLC supplies this series to customers in the United States and Latin America.
Reading a DU series code is straightforward once you know the pattern. Take 30318DU and 30319DU: these are single-row tapered roller bearings, where the leading digits point to the diameter series and the remaining digits to the size. The DU suffix marks a design variant within the NTN line, generally tied to the cage or the treatment applied to the part. If you want the exact equivalent confirmed, send the full code and our team will reply with a quote.
In plant and fleet maintenance, these bearings turn up in speed reducers, gearboxes, transmission shafts, mining and cement equipment, food processing lines, commercial vehicle wheel hubs and agricultural machinery. That range reflects the conditions they are chosen for: combined loads, frequent shocks and the need for adjustment during assembly. MR Industrial Accessories LLC supplies this line for replacement and maintenance work.
Selection comes down to three inputs: radial load, axial load and rotation speed, plus the lubrication method you plan to use. Tapered roller bearings are normally installed in pairs facing one another so they can take loads in both directions, with internal clearance set through shims or nuts. Shaft and housing alignment deserves attention, since these bearings do not tolerate misalignment well. Sealing and lubrication practice have a direct effect on how long the bearing lasts. If mounting is unclear, ask us and we will walk you through it.
Because tapered roller bearings are made to international standards, interchangeability between brands is common. Bring us a code from another manufacturer and we can identify the NTN equivalent, or another option that matches the same dimensions and load capacity. Confirming the complete designation and the tolerances before ordering avoids surprises. MR Industrial Accessories LLC helps you locate the right equivalent for the application.
To get a quote on your NTN DU series bearing, send the complete code by WhatsApp or email. Without the code on hand, share the main dimensions or a photo of the part and we will identify the reference you need. Our team responds promptly and can suggest equivalents or help you choose.
Dimensions
90 x 190 x 46.5 mm (d x D x T): boundary dimensions for basic designation 30318, according to ISO 355.
- Bore
- 90 mm
- Outside diameter (D)
- 190mm
- Total width (T)
- 46.5mm
SKF and other brands, same size
Other brands' pages with basic designation 30318: 90 x 190 x 46.5 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
- NTN 30318DU bearing: what are its dimensions?
- NTN 30318DU measures 90 mm across the bore and 190 mm across the outside diameter; its total width is 46.5 mm (90 x 190 x 46.5 mm). Those are the boundary dimensions standardized in ISO 355 for basic designation 30318.
- What does the DU suffix indicate on an NTN bearing?
- It flags a design variant in the NTN range, which may relate to heat treatment, cage type or a dimensional change. Send us the complete designation and we will confirm what it means for your code.
- When should I use a tapered roller bearing instead of a ball bearing?
- Tapered rollers take combined radial and axial loads that are far higher than a ball bearing can handle, and they suit setups where rigidity matters. For light, purely radial loads, a ball bearing is often enough.
- Can an NTN bearing replace one from a different brand?
- Yes, provided the main dimensions and load capacity line up, since international standards support interchangeability. Send us the original brand's code and we will quote the NTN equivalent or the best alternative.