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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
Availability:
5 in stock
Spindle deep groove ball bearing, 30 x 72 x 19 mm, open, straight bore, phenolic outer-land-riding cage, ABEC 3 / P6 precision, single row.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | M306KCR |
| Model | 6306 TB P6 / M 306 K CR / ABEC3 |
| Bearing Type | Ball Bearing, Open |
| ID | 30 mm |
| OD | 72 mm |
| Width | 19 mm |
| Material | High Carbon Chrome Steel |
|---|---|
| Series | 300 |
| Lubricant | Oil |
| Base Number | 306K |
| Industry Terms | spindle bearing; precision deep groove ball bearing; phenolic cage ball bearing; machine tool spindle bearing |
| Common Misspellings | Fafner M306KCR; Faffnir M306KCR; M306 KCR; M-306KCR |
| Bore Shaft Size | 30 mm |
| Mpn Variants | M306KCR; M-306-K-CR; M 306 K CR; 306K; 6306 TB P6; 6306-P6; 6206 T P6 |
| Precision Class | ABEC 3 / P6 |
| Closure Type | Open |
| Cage Type | CR – Phenolic outer land riding cage |
| Precision Rating | ABEC 3 / P6 |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Harmonization Code | 8482.10.50 |
| Design Units | Metric |
| Bearing Material | Chrome steel |
| Part Number | M306KCR |
| Cross Reference 1 | FAG 6306-TB-P6 |
|---|---|
| Cross Reference 2 | SKF 6306/P6 |
| Cross Reference 3 | NTN 6306P6 |
| Cross Reference 4 | Koyo 6306P6 |
| Cross Reference 5 | Fafnir 306K (related, standard precision, pressed steel cage) |
| Cross Reference 6 | 6306 (related, Conrad type, commercial grade) |
Fafnir M306KCR spindle deep groove ball bearing. Series: 300K. Base Number: 306K. Bore Diameter: 30 mm. Outside Diameter: 72 mm. Overall Width: 19 mm. Bore Type: Straight. Closure Type: Open. Rolling Elements: Ball. Number Of Rows: 1. Bearing Material: Chrome steel. Design Units: Metric.
M — spindle-quality execution at Precision Class ABEC 3 / P6.
306 — the 300K medium dimension series, 30 mm bore, ISO 6306 envelope.
K — spindle deep groove construction, a Conrad-type raceway with no built-in contact angle.
CR — phenolic outer land riding cage.
Precision Class: ABEC 3 / P6. Tighter bore, outside diameter and running-accuracy tolerances than a commercial-grade 6306, which is what puts this bearing on a machine-tool spindle rather than a general drive shaft.
Cage Material: Phenolic. Cage Type: CR – Phenolic outer land riding cage. A fabric-base phenolic cage guided on the outer ring land is much lighter than pressed steel, runs quieter, and carries oil in the pockets.
Closure Type: Open. Lubricant: grease or oil. An open bearing takes whichever the spindle lubrication system supplies.
Bore Type: Straight. The bearing mounts directly on a ground journal with an interference fit.
Unit Quantity: 1 Pc. Single bearing, supplied loose.
The cross-referenced parts share the 30 x 72 x 19 mm ISO 6306 envelope at P6 tolerance with a fabric-base phenolic cage. The list is deliberately short: only executions confirmed at both P6 and a phenolic cage are given as interchanges, and a standard-cage 6306 is listed as a related size because the cage change alters the speed ceiling.
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