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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:
1 in stock
Fafnir M307KCR precision spindle deep groove ball bearing, 35 x 80 x 21 mm, open, straight bore, phenolic cage, ABEC 3 / P6 tolerance class.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | M307KCR |
| Model | M 307 K CR / 6307 TB P6 / ABEC3 |
| Bearing Type | Ball Bearing, Open |
| ID | 35 mm |
| OD | 80 mm |
| Width | 21 mm |
| Series | 300K |
|---|---|
| Material | Chrome steel |
| Base Number | M307K |
| Overall Width | 21 mm |
| Mpn Variants | M307KCR; M-307-K-CR; M 307 K CR; M307K |
| Precision Class | ABEC 3 / P6 |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Internal Clearance | CN |
| Duty Type | Standard Duty |
| Bearing Material | Chrome steel |
| Industry Terms | precision spindle bearing, deep groove spindle bearing, P6 ball bearing, phenolic cage bearing, 300K series, Conrad type spindle bearing |
| Common Misspellings | Fafnir M307 KCR, Fafnir M-307KCR, Fanir M307KCR, Fafner M307KCR, Fafnir M307KR |
| Application Types | Machine tool spindles, precision motor shafts, high-speed drives, pumps |
| Cross Reference 1 | FAG 6307-TB-P6 |
|---|---|
| Cross Reference 2 | NSK 6307P6 |
| Cross Reference 3 | NTN 6307P6 |
| Cross Reference 4 | Koyo 6307P6 |
| Cross Reference 5 | Timken MM307K - P4 class, tighter tolerance |
| Cross Reference 6 | 6307 - standard tolerance, same envelope |
Fafnir M307KCR precision spindle deep groove ball bearing, single row, open, straight bore, phenolic cage, ABEC 3 / P6 tolerance class. 35 mm bore, 80 mm outside diameter, 21 mm width. Unit Quantity: 1 Pc. New old stock.
M — Fafnir precision spindle range at P6 tolerance, one class above standard. The doubled MM prefix marks the tighter P4 range.
307 — 300 heavy dimension series, bore code 07: a 35 mm bore in an 80 mm outside diameter.
K — spindle deep groove construction. Conrad-type raceways carry radial load and axial load from either direction, so the bearing has no contact angle.
CR — phenolic cage.
Bore Diameter: 35 mm. Outside Diameter: 80 mm. Overall Width: 21 mm. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Precision Class: ABEC 3 / P6. Internal Clearance: CN. Bearing Material: Chrome steel. Series: 300K. Base Number: M307K.
Envelope: 35 x 80 x 21 mm, the ISO 6307 envelope. Bore Type: Straight.
Cross-references: FAG 6307-TB-P6, NSK 6307P6, NTN 6307P6 and Koyo 6307P6 (P6 class, same 35 x 80 x 21 mm envelope), Timken MM307K (P4 class, tighter tolerance) and a standard-tolerance 6307 from any maker (same envelope, looser accuracy class). Searchable variants: M307KCR, M-307-K-CR, M 307 K CR, M307K. CAD model and data sheet: available from Timken (cad.timken.com) for the MM307K family.
Bore 35 mm, outside diameter 80 mm and width 21 mm.
ABEC 3 / P6 tolerance class with a phenolic cage.
CR is the Fafnir code for a phenolic cage.
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