Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
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Lot of 2 Pcs. Open heavy-series deep groove ball bearings, 30 mm bore x 72 mm OD x 19 mm wide, normal clearance. One of the most widely fitted industrial sizes — motors, gearboxes, pumps and fan shafts.
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$25.46
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Here are some other options that might fit your project — cross-referenced equivalents and similar parts we have in stock and ready to ship. Need help choosing? Call 585-295-7880.
Spindle Deep Groove Ball Bearing – 30 mm ID x 72 mm OD x 19 mm, Straight Bore, Open, Phenolic Cage, ABEC 3 / P6$21.22
Ball bearing - Straight Bore, 30 mm ID, 62 mm OD, 16 mm Width, Open, Without Snap Ring.$101.75
Maximum Capacity Filling Slot Ball Bearing - 30 mm Bore, 90 mm OD, 23 mm Width, Open, Straight Bore, Heavy 400 Series$26.73
Deep Groove Ball Bearing - Straight Bore, 30 mm ID, 55 mm OD, 13 mm Width, Open, Without Snap Ring.$49.60| MFR / Brand | SKF |
|---|---|
| MPN | 6306 |
| Model | 6306 |
| Bearing Type | Ball Bearing |
| ID | 30 mm |
| OD | 72 mm |
| Width | 19 mm |
| Material | Steel |
|---|---|
| Base Number | 6306 |
| Industry Terms | Deep groove ball bearing, open ball bearing, radial ball bearing, heavy series ball bearing, 30mm bore bearing, motor bearing, 6306 bearing pair |
| Common Misspellings | 6306ZZ, 63 06, 6360, SKF6306, 6306 2RS |
| Application Types | Electric motors, small and medium gearboxes, pumps, fan and blower shafts, agricultural drives, conveyor idlers |
| Bore Shaft Size | 30 mm |
| Mpn Variants | 6306, 6306J, 6306 C3, 63 06, 6306-2Z, 6306NR |
| Number Of Rows | 1 |
| Snap Ring Included | No |
| Part Number | 6306 |
| Cross Reference 6 | Timken 306K |
|---|
Two single-row deep groove ball bearings in the 63 heavy dimension series — 30 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 6306 is one of the most widely fitted industrial bearing sizes there is: electric motors, small and medium gearboxes, pumps, fan and blower shafts, agricultural drives and conveyor idlers.
6: single-row deep groove ball bearing.
3: dimension series 63, the heavy section and width.
06: bore code, 06 x 5 = 30 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.
On a 30 mm shaft the heavy 63 section gives 72 mm outside diameter and 19 mm width, against 62 x 16 for a medium 6206 and 55 x 13 for a light 6006. Same bore, meaningfully more capacity and life, which is why the 6306 is the default when a 30 mm shaft has real load on it. The cost is a larger housing bore and a lower speed ceiling than the lighter series.
Being open, these arrive without service grease. Each takes lubricant on assembly and is sealed by the housing. An open bearing relubricates freely and runs in splash or circulating oil, which is why gearboxes specify it.
Clearance is normal (CN). A 6306/C3 is the greater-clearance variant for a hot shaft or a tight interference fit.
Bore: 30 mm.
Outside diameter: 72 mm.
Width: 19 mm.
Dimension series: 63 (heavy).
Rows: 1.
Closure: open, both sides.
Internal clearance: normal (CN).
Material: through-hardened bearing steel.
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 30 x 72 x 19 mm 6306 bearings: FAG 6306, NSK 6306, NTN 6306, Koyo 6306, Nachi 6306 and Timken 306K. A 6206 or 6006 shares the bore only and is a smaller, lower-capacity bearing. A 6306-2Z, 6306-2RS1 or 6306/C3 changes closure or clearance.
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