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Lot of 4 Pcs. Wide-width cartridge deep groove ball bearings, 17 mm bore x 40 mm OD x 11/16 in (17.5 mm) wide, with contact rubber seals both sides and factory grease. The extra width is the point — they do not swap for a standard 12 mm-wide 6203.
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| MFR / Brand | NSK |
|---|---|
| MPN | 63203DDU |
| Model | 63203 DDU X28 |
| Bearing Type | Ball Bearing |
| ID | 17 mm |
| OD | 40 mm |
| Width | 11/16 in |
| Material | Bearing Steel |
|---|---|
| Condition | New – Open box |
| Relubrication | No - sealed, not relubricatable |
| Base Number | 63203 |
| Industry Terms | Cartridge bearing, wide inner race bearing, sealed ball bearing, 17mm bore sealed bearing, rubber sealed deep groove, bulk bearing lot |
| Common Misspellings | 63203DU, 63203 DDU X-28, 6320 3DDU, 63203DDV, NSK63203DDU |
| Application Types | Cartridge housings, agricultural and turf gearboxes, idler and roller assemblies, washdown equipment, small conveyors |
| Condition Note | Made In Japan, New, No Box. |
| Bore Shaft Size | 17 mm |
| Mpn Variants | 63203DDU, 63203-DDU, 63203 DDU, 63203DDU-X28, 63203-DDU-X28, 63203RS, 63203-2RS |
| Additional Attributes | Sold as a 4-piece lot; wide-width cartridge series, not interchangeable with a 12 mm wide 6203 |
| Number Of Rows | 1 |
| Snap Ring Included | No |
| Design Units | Metric bore and OD, inch width |
| Bearing Material | Through-hardened bearing steel |
| Part Number | 63203DDU |
| Cross Reference 1 | 63203-2RS |
|---|---|
| Cross Reference 2 | Koyo 63203-2RS |
| Cross Reference 3 | NTN 63203LLU |
| Cross Reference 4 | 63203 2RS1 |
A lot of 4 pieces of NSK 63203DDU — single-row deep groove ball bearings from NSK’s wide-width “light cartridge” family, 17 mm bore by 40 mm outside diameter, 11/16 in (about 17.5 mm) wide, sealed on both sides with contact rubber seals and pre-greased. The cartridge series takes the familiar 6203 bore and outside diameter and widens both rings, which is how bolt-in cartridge housings, farm and turf gearboxes, and idler assemblies get a wider seat and more axial ring support in the same diameter.
6 – single-row deep groove ball bearing32 – NSK wide-width cartridge prefix applied to the 02 series envelope03 – bore code, 17 mm boreDDU – contact rubber seals on both sides (NSK scheme). DU would be one seal, VV non-contact rubber, ZZ metal shieldsNo clearance suffix – normal (CN) radial internal clearance; a 63203DDUC3 is the greater-clearance variant, a different part
63203-2RS is the common industry equivalent designation for the same closure. The trailing X28 seen on some cartons for this item is carried as a searchable reference only.
DDU is the closure to get right. Contact rubber seals ride on the inner ring, so they exclude dust, washdown spray and grit far better than metal shields, and the bearing arrives pre-greased and closed for life. The cost is a little more running torque and a lower speed ceiling than a shielded ZZ or a non-contact VV. A ZZ is not a substitute in a dirty or wet application, and an open bearing is not a substitute at all — it arrives dry and needs the housing to do the sealing.
The width is the other trap. This is 11/16 in wide against 12 mm on a standard 6203. Fit a 6203 in a 63203 seat and the inner ring will not clamp; fit a 63203 where a 6203 belongs and it will not go in. Measure the width before ordering.
Bore: 17 mmOutside diameter: 40 mmWidth: 11/16 in (approximately 17.5 mm)Type: single-row deep groove ball bearing, wide-width cartridge seriesClosure: contact rubber seals, both sides (DDU)Internal clearance: normal (CN)Lubrication: factory greased, sealedMaterial: through-hardened bearing steel
Sold as one lot of 4 Pcs. Bearings only — no housings, no cartridges, no collars. Marked Made in Japan; supplied new, without the original boxes.
Press on the ring being fitted and never through the balls, or the seal lips and the ball path both take the load. Do not attempt to relubricate through the seals; these are sealed for life. Keep the seal faces clean during assembly — a rolled seal lip lets contamination straight in.
Genuine interchanges are same-envelope wide cartridge bearings with contact seals both sides: 63203-2RS, Koyo 63203-2RS, NTN 63203LLU and Fafnir/Timken W203PP style wide-inner cartridge bearings of matching width. A 6203DDU (12 mm wide), a 63203ZZ (metal shields) and a 63203DDUC3 (greater clearance) are related parts, not drop-in equivalents.
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