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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:
1 in stock
Lot of 2 Pcs. Open extra-heavy-series deep groove ball bearings, 20 mm bore x 72 mm OD x 19 mm wide. The 64 series puts an unusually large ball complement on a small shaft, so it carries far more load than a 6204 or 6304.
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| MFR / Brand | SKF |
|---|---|
| MPN | 6404 |
| GTIN | 7316577738608 |
| Model | 6404 |
| Bearing Type | Deep Groove Ball Bearing |
| ID | 20 mm |
| OD | 72 mm |
| Width | 19 mm |
| Material | Steel |
|---|---|
| Base Number | 6404 |
| Industry Terms | Deep groove ball bearing, extra heavy series ball bearing, 64 series bearing, 20mm bore bearing, open ball bearing, high capacity ball bearing |
| Common Misspellings | 6404ZZ, 64-04, 6044, SKF6404, 6404 2RS |
| Application Types | Small heavily loaded gearboxes, idlers and tensioners, machine tool accessories, agricultural drives |
| Bore Shaft Size | 20 mm |
| Mpn Variants | 6404, 6404 C3, 6404-2Z, 64 04, 6404J |
| Number Of Rows | 1 |
| Snap Ring Included | No |
| Part Number | 6404 |
Two single-row deep groove ball bearings from the 64 extra-heavy dimension series — 20 mm bore, 72 mm outside diameter, 19 mm wide, open on both sides. Deep groove ball bearings carry radial load plus axial load in either direction. The 64 series wraps a very large outside diameter and ball set around a small bore, which is how a 20 mm shaft ends up carrying loads normally reserved for a much bigger bearing.
6: single-row deep groove ball bearing.
4: dimension series 64, the extra-heavy section.
04: bore code, 04 x 5 = 20 mm bore.
No closure suffix: open both sides. A 2Z is steel shields, a 2RS1 contact rubber seals.
No clearance suffix: normal (CN) radial internal clearance.
Compare the family on a 20 mm shaft: a 6204 is 47 mm outside diameter and 14 mm wide, a 6304 is 52 x 15, and this 6404 is 72 x 19. Same bore, far more bearing. That buys a large jump in radial capacity and life where the shaft cannot be made bigger but the load will not go away — small heavily loaded gearboxes, idlers, tensioners and machine tool accessories. What it costs is a large housing bore, more weight and a lower speed ceiling than the lighter series.
Because these are open, they arrive without service grease. Each takes lubricant on assembly and is sealed by the housing. An open bearing relubricates freely and will run in circulating or splash oil.
Bore: 20 mm.
Outside diameter: 72 mm.
Width: 19 mm.
Dimension series: 64 (extra heavy).
Rows: 1.
Closure: open, both sides.
Internal clearance: normal (CN).
Material: through-hardened bearing steel.
EAN: 7316577738608.
Sold as one lot of 2 Pcs — two individual open bearings, not a matched or preloaded pair. No shields, no seals, no snap rings.
Genuine interchanges are same-envelope 20 x 72 x 19 mm 64-series bearings: FAG 6404, NSK 6404, NTN 6404, Koyo 6404 and Nachi 6404. A 6204 or 6304 shares the bore only and is a much smaller, lower-capacity bearing. A 6404-2Z or 6404-2RS1 is the same envelope with a different closure.
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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