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3 in stock
Super-precision angular contact duplex pair, 40 x 90 x 23 mm each, 25° contact angle, heavy preload, phenolic cage, P4S, 52,300 N dynamic.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM308WICRDUH |
| Model | 3 MM 308 WI CR DUH / 7308 E T DUH P4 7308A 7308A5 7308ACD |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 40 mm |
| OD | 90 mm |
| Width | 23 mm |
| Material | Chrome Steel |
|---|---|
| Series | 300 |
| Condition | New – Open box |
| Preload | Heavy preload |
| Base Number | 3MM308WI |
| Industry Terms | spindle bearing; machine tool spindle bearing; super precision angular contact ball bearing; matched duplex pair; heavy preload set |
| Common Misspellings | Fafner 3MM308WIDUH; Faffnir 3MM308WIDUH; 3MM 308WIDUH; 3M308WIDUH |
| Total Width | 46 mm |
| Condition Note | Made In USA, New Old Stock |
| Bore Shaft Size | 40 mm |
| Mpn Variants | 3MM308WI-DUH; 3MM308WICRDUH; 3MM-308-WI-CR-DUH; 3 MM 308 WI CR DUH; 7308E-T-DUH-P4; 7308-A |
| Arrangement Configuration | DUH duplex pair, universally ground, heavy preload |
| Precision Class | ABEC 7/9 / P4S |
| Dynamic Load Rating C1 | 57,500 N |
| Additional Attributes | Maximum Shaft Fillet Radius: 1.5 mm; Outer Ring To Clear Radius: 1.5 mm; Shaft Backing Shoulder Diameter: 49.3 mm; Housing Backing Shoulder Diameter: 81.3 mm; Timken world part number 7308E-T-DUH-P4 |
| Cage Type | CR – Phenolic outer land riding cage |
| Dynamic Load Rating | 52,300 N |
| Static Load Rating | 33,800 N |
| Precision Rating | ABEC 7/9 / P4S |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Limiting Speed | 15,200 rpm grease; 30,400 rpm oil |
| Internal Clearance | N/A |
| Lubricant | Grease or oil |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Mounting Arrangement | Duplex, universally ground |
| Design Units | Metric |
| Bearing Material | Chrome steel |
| Part Number | 3MM308WI-CR-DUH |
| Cross Reference 1 | SKF 7308 ACD/P4ADGC |
|---|---|
| Cross Reference 2 | FAG B7308-E-T-P4S-DUH |
| Cross Reference 3 | NSK 7308A5TRDUHP4 |
| Cross Reference 4 | RHP B7308X3TDUHP4 |
| Cross Reference 5 | Timken 7308E-T-DUH-P4 |
| Cross Reference 6 | 7308-A (related, 30° NSK-scheme execution) |
Fafnir 3MM308WI-CR-DUH super-precision angular contact ball bearings, 300WI spindle series, supplied as a universally ground duplex pair. Bore Diameter: 40 mm. Outside Diameter: 90 mm. Overall Width: 23 mm per bearing. Total Width: 46 mm for the pair. Bore Type: Straight. Closure Type: Open. Rolling Elements: Ball. Bearing Material: Chrome steel. Number Of Rows: 1 per bearing. Design Units: Metric.
3MM — 25° contact angle in the Fafnir super-precision spindle range.
MM — super-precision spindle execution at Precision Class ABEC 7/9 / P4S.
308 — the 300WI medium dimension series, ISO 7308 envelope, 40 mm bore.
WI — low shoulder on both rings.
CR — phenolic outer land riding cage, in Timken’s own wording.
DU — duplex, a factory-matched pair ground to run together.
H — heavy preload.
Contact Angle: 25°. The 25° angle on the heavier 300 series gives this pair high axial stiffness and a large thrust capacity for its envelope.
Dynamic Load Rating: 52,300 N per bearing. Dynamic Load Rating (C1): 57,500 N for the duplex set. Static Load Rating: 33,800 N.
Limiting Speed: 15,200 rpm grease; 30,400 rpm oil. Lubricant: grease or oil.
Precision Class: ABEC 7/9 / P4S.
Cage Material: Phenolic. Cage Type: CR – Phenolic outer land riding cage. A phenolic cage guided on the outer ring land runs quiet and holds ball spacing under load.
Preload: Heavy. Internal Clearance: N/A. A heavy preload buys maximum stiffness and the tightest shaft location, and it is why the speed ceiling sits below the light and medium executions of the same bearing.
Maximum Shaft Fillet Radius: 1.5 mm. Outer Ring To Clear Radius: 1.5 mm. Shaft Backing Shoulder Diameter: 49.3 mm. Housing Backing Shoulder Diameter: 81.3 mm.
Unit Quantity: 2 Pcs. Mounting Arrangement: Duplex, universally ground. Universal grinding lets the two rings be clamped back to back, face to face or in tandem and still deliver the published heavy preload.
Timken’s own world part number for this execution is 7308E-T-DUH-P4. The cross-referenced parts share the 40 x 90 x 23 mm envelope at a 25° contact angle, P4-class tolerance and a heavy-preload matched pair. A 7308 at 15° or 40° on the same envelope is a related size rather than a substitution.
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