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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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1 in stock
Super-precision angular contact ball bearing duplex pair, 35 x 80 x 21 mm each, 25° contact angle, light preload, phenolic cage, ABEC 7 / P4 precision.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM307WICRDUL |
| GTIN | 087796071520 |
| Model | 3MM307WIDUL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 35 mm |
| OD | 80 mm |
| Width | 21 mm |
| Material | Bearing Steel |
|---|---|
| Series | 300WI |
| Preload | Light |
| Base Number | 3MM307WI |
| Total Width | 42 mm (pair) |
| Overall Width | 21 mm |
| Mpn Variants | 3MM307WIDUL; 3MM-307-WI-DUL; 3 MM 307 WI CR DUL; 3MM307WICRDUL; 7307E-T-DUL-P4 |
| Precision Class | ABEC 7 / P4 |
| Additional Attributes | Shaft backing shoulder 43.2 mm; housing backing shoulder 72.1 mm; max housing fillet radius 1.5 mm; C1 per bearing; pair weight 0.886 kg |
| Dynamic Load Rating | 44,500 N (per bearing) |
| Static Load Rating | 24,700 N (per bearing) |
| Rolling Elements | Ball |
| Item Weight | 0.886 kg (1.96 lb) per pair |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Limiting Speed | 18,800 rpm grease; 34,600 rpm oil |
| Harmonization Code | 8482.10.50.68 |
| Contact Angle | 25° |
| Mounting Arrangement | Universally ground duplex pair |
| Industry Terms | super precision angular contact bearing; machine tool spindle bearing; matched duplex pair; universally ground duplex bearing; P4 spindle bearing |
| Common Misspellings | Fafnir 3MM 307 WI DUL, Fanir 3MM307WI, Fafnir 3MM307WI CRDUL, 3MM307 WICR DUL, Faffnir 3MM307WI-DUL |
| Application Types | Machine tool spindles; precision grinders; high-speed motor spindles; precision positioning |
| Cross Reference 1 | FAG B7307-E-T-P4S-UL |
|---|---|
| Cross Reference 2 | SKF 7307 ACD/P4ADGA |
| Cross Reference 3 | NSK 7307A5TRDULP4 |
| Cross Reference 4 | NTN 7307UAD/GNP4 |
| Cross Reference 5 | RHP 7307ETDULP4 |
| Cross Reference 6 | Koyo 7307A5 P4 DUL |
| Cross Reference 7 | 7307-A (related size, standard tolerance) |
Fafnir 3MM307WICRDUL, a super-precision angular contact ball bearing supplied as a universally ground duplex pair, 25° contact angle, light preload, phenolic cage. Unit Quantity: 2 Pcs.
3MM — Fafnir super-precision spindle range at a 25° contact angle, precision class P4 (ABEC 7).
307 — 300 heavy dimension series, bore code 07: a 35 mm bore in an 80 mm outside diameter.
WI — low shoulder on both rings.
CR — phenolic cage.
DUL — duplex pair, universally ground, light preload. Either face can be brought together, so the pair mounts back-to-back, face-to-face or in tandem.
Bore Diameter: 35 mm. Outside Diameter: 80 mm. Overall Width: 21 mm per bearing. Total Width: 42 mm as a pair. Contact Angle: 25°. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Precision Class: ABEC 7 / P4. Preload: Light. Dynamic Load Rating: 44,500 N per bearing. Static Load Rating: 24,700 N per bearing. Limiting Speed: 18,800 rpm grease; 34,600 rpm oil. Item Weight: 0.886 kg (1.96 lb) for the pair. Series: 300WI. Base Number: 3MM307WI. GTIN: 087796071520.
Shaft Backing Shoulder Diameter: 43.2 mm. Housing Backing Shoulder Diameter: 72.1 mm. Maximum Housing Fillet Radius: 1.5 mm (0.059 in).
Super-precision equivalents on the 7307 envelope at 25° with light preload: FAG B7307-E-T-P4S-UL, SKF 7307 ACD/P4ADGA, NSK 7307A5TRDULP4, NTN 7307UAD/GNP4, RHP 7307ETDULP4 and Koyo 7307A5 P4 DUL. A standard-tolerance 7307-A or 7307-B shares the envelope and angle only. MPN Variants: 3MM307WIDUL, 3MM-307-WI-DUL, 3 MM 307 WI CR DUL, 3MM307WICRDUL, 7307E-T-DUL-P4.
A universally ground duplex pair with light preload.
35 mm bore, 80 mm outside diameter, 21 mm width per bearing, 25° contact angle.
Dynamic load rating 44,500 N and static load rating 24,700 N per bearing; limiting speed 18,800 rpm on grease and 34,600 rpm on oil.
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