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Precision spindle deep groove ball bearing, 35 x 80 x 21 mm, open, straight bore, phenolic cage, ABEC 7/9 class. Three pieces.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | RMM307KCR |
| Model | R MM 307 K CR / 6307 TB P4 / ABEC7 |
| Bearing Type | Ball Bearing, Open |
| ID | 35 mm |
| OD | 80 mm |
| Width | 21mm |
| Series | 300 |
|---|---|
| Condition | New – Open box |
| Lubricant | Oil |
| Material | Bearing Steel |
| Base Number | MM307K |
| Condition Note | Made In USA, New Old Stock |
| Overall Width | 21 mm |
| Mpn Variants | RMM307KCR; R-MM-307-K-CR; R MM 307 K CR; MM307KCR; MM307K |
| Precision Class | ABEC 7/9 / P4S |
| Dynamic Load Rating | 37,100 N |
| Static Load Rating | 18,300 N |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Limiting Speed | 19,400 rpm grease; 38,800 rpm oil |
| Internal Clearance | CN |
| Harmonization Code | 84821000 |
| Cross Reference 1 | FAG 6307-TB-P4 |
|---|---|
| Cross Reference 2 | NSK 6307P4 |
| Cross Reference 3 | NTN 6307P4 |
| Cross Reference 4 | Koyo 6307P4 |
| Cross Reference 5 | RHP 6307EP4 |
| Cross Reference 6 | Timken MM307K |
| Cross Reference 7 | 6307 (related size, standard tolerance Conrad type) |
Fafnir RMM307KCR, a precision spindle deep groove ball bearing. 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 7/9 / P4S. Internal Clearance: CN. Series: 300K. Base Number: MM307K.
MM — Fafnir super-precision spindle range, ground to ABEC 7/9 (P4S) tolerances.
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.
Dynamic Load Rating: 37,100 N. Static Load Rating: 18,300 N. Limiting Speed: 19,400 rpm grease; 38,800 rpm oil. A phenolic cage is light and absorbs vibration, which lifts the speed rating of this execution above a pressed-steel equivalent on the same envelope. ABEC 7/9 tolerances hold running accuracy tight enough for grinding and milling spindles.
Unit Quantity: 3 Pcs. Three single-row bearings ship together. A deep groove spindle bearing is not preload-matched, so each piece stands alone and can be fitted singly or stacked as the spindle design calls for.
The MM307K envelope is the ISO 6307 envelope, 35 x 80 x 21 mm, in a super-precision execution. FAG 6307-TB-P4, NSK 6307P4, NTN 6307P4, Koyo 6307P4 and RHP 6307EP4 are the direct precision-class equivalents. A standard-tolerance 6307 shares the envelope only. Searchable variants include RMM307KCR, R-MM-307-K-CR, R MM 307 K CR, MM307KCR and MM307K.
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