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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
Availability:
2 in stock
Open heavy-series deep groove ball bearing, 105 mm bore x 225 mm OD x 49 mm wide, with C3 greater-than-normal clearance for hot shafts and tight interference fits. New old stock, France-marked carton. Sold as 1 piece.
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$182.72
2 in stock
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| MFR / Brand | SKF |
|---|---|
| MPN | 6321/C3 |
| GTIN | 7316576619786 |
| Model | 6321 C3 |
| Bearing Type | Deep Groove Ball Bearing |
| ID | 105 mm |
| OD | 225 mm |
| Width | 49 mm |
| Material | Steel |
|---|---|
| Base Number | 6321 |
| Industry Terms | Deep groove ball bearing, open ball bearing, heavy series ball bearing, C3 clearance bearing, 105mm bore bearing, large motor bearing, mill drive bearing |
| Common Misspellings | 6321 C-3, 6321c3, 6231C3, SKF6321C3, 6321/3 |
| Application Types | Large electric motors, crusher and mill drives, kiln and process fans, heavy gearboxes, conveyor head shafts |
| Bore Shaft Size | 105 mm |
| Mpn Variants | 6321/C3, 6321C3, 6321 C3, 6321-C3, 6321 |
| Manufacturer Status | New old stock |
| Number Of Rows | 1 |
| Snap Ring Included | No |
| Part Number | 6321/C3 |
| Country Region Of Manufacture | France |
| Cross Reference 1 | FAG 6321-C3 |
|---|---|
| Cross Reference 2 | NSK 6321C3 |
| Cross Reference 3 | NTN 6321C3 |
| Cross Reference 4 | Koyo 6321C3 |
| Cross Reference 5 | SKF 6321 – normal clearance, not C3 |
| Cross Reference 6 | SKF 6321/C4 – C4 clearance, looser than C3 |
| Cross Reference 7 | SKF 6321-2Z/C3 – shields, not open |
A single-row deep groove ball bearing in the 63 heavy dimension series — 105 mm bore, 225 mm outside diameter, 49 mm wide — open on both sides, with C3 greater-than-normal radial internal clearance. Deep groove ball bearings carry radial load plus axial load in either direction. At this size and section it is a large motor, crusher, mill drive, kiln fan and heavy gearbox bearing.
6: single-row deep groove ball bearing.
3: dimension series 63, the heavy section and width.
21: bore code, 21 x 5 = 105 mm bore.
/C3: radial internal clearance greater than normal.
No closure suffix: open both sides. A 2Z is steel shields, a 2RS1 contact rubber seals.
Two specs decide this bearing. The heavy 63 section puts a 225 mm outside diameter and 49 mm width on a 105 mm shaft, where a medium 6221 uses 190 x 36 and a light 6021 just 160 x 26. Same bore, a great deal more capacity and life, which is why the 6321 turns up under real load on large motors and mill drives. The cost is size, weight and a lower speed ceiling.
The other is C3. Greater-than-normal clearance suits a large motor shaft: the inner ring goes on with a firm interference fit and the shaft runs hotter than the housing, so a normal-clearance bearing loses its clearance to thermal growth, preloads itself and overheats. C3 in a cool, lightly loaded machine can run noisy.
Being open, the bearing arrives without service grease and is sealed by the housing and lubricated by the machine. It relubricates freely and runs in circulating or splash oil.
Bore: 105 mm.
Outside diameter: 225 mm.
Width: 49 mm.
Dimension series: 63 (heavy).
Rows: 1.
Closure: open, both sides.
Internal clearance: C3, greater than normal.
Material: through-hardened bearing steel.
EAN: 7316576619786.
Sold as 1 piece, one open bearing. No shields, no seals, no snap ring, no housing. New old stock: unused, from an opened carton marked Made in France.
Same 105 x 225 x 49 mm open bearings with C3 clearance: FAG 6321-C3, NSK 6321C3, NTN 6321C3 and Koyo 6321C3. A plain 6321 (normal clearance) or a 6321/C4 (looser still) is a different clearance class; a 6321-2Z or 6321-M with a machined brass cage changes closure or cage. A 6221 or 6021 of the same bore is a lighter series and a physically smaller bearing.
Rockwell’s own product page for the Kinetix 6000 is down
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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