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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
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Fafnir M310KCR precision spindle deep groove ball bearing, 50 x 110 x 27 mm, open, straight bore, phenolic cage, ABEC 5 / P5 tolerance class.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | M310KCR |
| Model | M 310 K CR / 6310 T P5 6310P5 |
| Bearing Type | Ball Bearing |
| ID | 50 mm |
| OD | 110 mm |
| Width | 27 mm |
| Base Number | M310K |
|---|---|
| Overall Width | 27 mm |
| Mpn Variants | M310KCR; M-310-K-CR; MM-310-K-CR; M 310 K CR; M310K; 6310P5; 6310-T-P5 |
| Precision Class | ABEC 5 / P5 |
| Series | 300K |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Internal Clearance | CN |
| Bearing Material | Chrome steel |
| Industry Terms | precision spindle bearing; P5 deep groove ball bearing; 6310 P5 bearing; machine tool spindle bearing; 50x110x27 bearing |
| Common Misspellings | Fanir M310KCR; Fafnr M310KCR; M310 KCR; M-310KCR; Fafnir M 310 KCR |
| Application Types | Machine tool spindles; high-speed precision shafts; precision gearboxes; motor spindles |
| Cross Reference 1 | FAG 6310-TB-P5 |
|---|---|
| Cross Reference 2 | NSK 6310P5 |
| Cross Reference 3 | NTN 6310P5 |
| Cross Reference 4 | Koyo 6310P5 |
| Cross Reference 5 | Timken MM310K (related, tighter P4S class) |
| Cross Reference 6 | 6310 (related size, standard tolerance Conrad type) |
Fafnir M310KCR is a precision spindle deep groove ball bearing, single row, open, with a straight bore, phenolic cage and ABEC 5 / P5 tolerance class. It has no contact angle. Unit Quantity: 1 Pc.
M — Fafnir precision spindle range. The carton cross gives the tolerance class as P5.
310 — 300 heavy dimension series, bore code 10: 50 mm bore, 110 mm outside diameter.
K — spindle deep groove construction; Conrad-type raceways carry radial load and axial load from either direction.
CR — phenolic cage.
Bore Diameter: 50 mm. Outside Diameter: 110 mm. Overall Width: 27 mm. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Precision Class: ABEC 5 / P5. Internal Clearance: CN. Bearing Material: Chrome steel. Series: 300K. Base Number: M310K. Unit Quantity: 1 Pc.
Envelope: 50 x 110 x 27 mm (bore x outside diameter x width), the ISO 6310 envelope. Straight bore, open on both sides.
Cross-references: FAG 6310-TB-P5, NSK 6310P5, NTN 6310P5 and Koyo 6310P5 in the P5 class. Timken MM310K has the same geometry in the tighter P4S class. A standard-tolerance 6310 shares the envelope in a looser accuracy class.
Bore Diameter: 50 mm. Outside Diameter: 110 mm. Overall Width: 27 mm.
Precision Class: ABEC 5 / P5. Cage Material: Phenolic.
FAG 6310-TB-P5, NSK 6310P5, NTN 6310P5 and Koyo 6310P5.
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