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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:
4 in stock
Spindle deep groove ball bearing, 40 x 90 x 23 mm, open, straight bore, phenolic outer-land-riding cage, ABEC 3 / P6 precision, single row.
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$25.46
4 in stock
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| MFR / Brand | Fafnir |
|---|---|
| MPN | M308KCR |
| Model | M 308 K CR / 6308 T P6 |
| Bearing Type | Ball Bearing, Open |
| ID | 40 mm |
| OD | 90 mm |
| Width | 23 mm |
| Material | High Carbon Chrome Steel |
|---|---|
| Series | 300 |
| Lubricant | Grease |
| Base Number | 308K |
| Industry Terms | spindle bearing; precision deep groove ball bearing; phenolic cage ball bearing; machine tool spindle bearing |
| Common Misspellings | Fafner M308KCR; Faffnir M308KCR; M308 KCR; M-308KCR |
| Bore Shaft Size | 40 mm |
| Mpn Variants | M308KCR; M-308-K-CR; M 308 K CR; M308K; 6308 T P6; 6308-P6 |
| Precision Class | ABEC 3 / P6 |
| Additional Attributes | Maximum Housing Fillet Radius: 1.5 mm |
| 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 | M308KCR |
| Cross Reference 1 | FAG 6308-TB-P6 |
|---|---|
| Cross Reference 2 | SKF 6308/P6 |
| Cross Reference 3 | NTN 6308P6 |
| Cross Reference 4 | Koyo 6308P6 |
| Cross Reference 5 | Fafnir 308K (related, standard precision, pressed steel cage) |
| Cross Reference 6 | 6308 (related, Conrad type, commercial grade) |
Fafnir M308KCR spindle deep groove ball bearing. Series: 300K. Base Number: 308K. Bore Diameter: 40 mm. Outside Diameter: 90 mm. Overall Width: 23 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.
308 — the 300K medium dimension series, 40 mm bore, ISO 6308 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 6308, which is what makes it usable 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 far lighter than a pressed steel cage, runs quieter, and holds oil in the pockets. It is the reason the CR execution is specified in place of a standard 6308 in a spindle.
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.
Maximum Housing Fillet Radius: 1.5 mm. That is the largest fillet in the housing bore that the bearing outer ring corner will clear.
Unit Quantity: 1 Pc. Single bearing, supplied loose.
The cross-referenced parts share the 40 x 90 x 23 mm ISO 6308 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 6308 is listed as a related size because the cage change alters the speed ceiling.
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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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