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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:
2 in stock
Matched pair of 3MM9124WI-CR-DUL angular contact spindle bearings, 120 x 180 x 28 mm each, 25° contact angle, light preload, P4S, phenolic cage.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM9124WI DUL |
| GTIN | 087796073210 |
| Model | 3MM9124WI-CR-DUL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 120 mm |
| OD | 180 mm |
| Width | 28 mm |
| Material | Chrome Steel |
|---|---|
| Series | 9100WI (Fafnir spindle series, ISO 7024 envelope) |
| Preload | Light |
| Base Number | 3MM9124WI |
| Industry Terms | super precision spindle bearing pair; duplex angular contact set; 25 degree spindle bearing; machine tool spindle bearing; P4S matched pair |
| Common Misspellings | 3MM 9124 W1 DUL; 3MM9124WIDUI; Fafnier 3MM9124WI; 3MN9124WI-DUL; 3MM9124 WI-DUL |
| Application Types | Machine tool spindles; grinding and milling spindles; high speed gearboxes; precision rotary tables |
| Bore Shaft Size | 120 mm (4.7244 in) |
| Mpn Variants | 3MM9124WIDUL; 3MM9124WI-CR-DUL; 3MM 9124 WI CR DUL; 3MM9124WICRDUL; 3MM9124WI; 7024E; 7024 CR DUL P4S |
| Precision Class | ISO P4S (ABEC 7/9) |
| Cage Type | CR - Phenolic Outer Land Riding Cage |
| Dynamic Load Rating | 105,000 N (set); 95,600 N (ISO, per row) |
| Static Load Rating | 103,200 N |
| Precision Rating | ISO P4S (ABEC 7/9) |
| Rolling Elements | Ball |
| Item Weight | 9.62 lb (pair) |
| Cage Material | Phenolic |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | No |
| Limiting Speed | 6,900 rpm grease; 12,400 rpm oil |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Part Number | 3MM9124WI-CR-DUL |
| Cross Reference 1 | SKF 7024 ACD/P4ADGA |
|---|---|
| Cross Reference 2 | Timken 7024E-T-P4S-DUL |
| Cross Reference 3 | Fafnir 3MM9124WI DUM - same pair, medium preload |
| Cross Reference 4 | Fafnir 3MM9124WI DUH - same pair, heavy preload |
Fafnir 3MM9124WI-CR-DUL matched duplex pair of super-precision single-row angular contact ball bearings, universally ground. Unit Quantity: 2 Pcs, one matched duplex pair. Timken World Part Number: 7024E-T-P4S-DUL. GTIN: 087796073210.
3MM — Fafnir super-precision prefix, 25° contact angle.
9124 — Fafnir 9100 series, ISO 7024 envelope, 120 x 180 x 28 mm.
WI — super-precision angular contact spindle family with a low shoulder on both rings.
CR — phenolic cage, outer land riding.
DUL — duplex pair, universally ground, light preload.
Bore Diameter: 120 mm (4.724 in). Outside Diameter: 180 mm (7.087 in). Bearing Width: 28 mm (1.102 in) per bearing. Total Width: 56 mm (2.205 in) as a pair. Contact Angle: 25°. Dynamic Load Rating (C1, Timken 1M revs, set): 105,000 N. Dynamic Load Rating (C1 ISO, per row): 95,600 N. Static Load Rating (C0): 103,200 N. Limiting Speed: 6,900 rpm grease; 12,400 rpm oil. Precision Rating: ISO P4S (ABEC 7/9). Preload: Light. Rolling Elements: steel balls. Bearing Material: chrome steel. Cage Type: CR — Phenolic Outer Land Riding Cage. Closure Type: Open. Number Of Rows: 1 per bearing. Item Weight: 9.62 lb for the pair, 4.81 lb per bearing.
Shaft Backing Shoulder Diameter: 132.5 mm (5.220 in). Housing Backing Shoulder Diameter: 168.3 mm (6.630 in). Maximum Shaft Fillet Radius: 2 mm (0.079 in). Outer Ring To Clear Radius: 2 mm (0.079 in). Bore Type: Straight.
Cross-references: SKF 7024 ACD/P4ADGA; Timken 7024E-T-P4S-DUL (Timken world part number for this set). The DUM and DUH suffixes are the same pair at medium and heavy preload. CAD model and data sheet: available from Timken.
Bore 120 mm, outside diameter 180 mm, width 28 mm per bearing, with a 25° contact angle.
DUL is a duplex pair, universally ground, at light preload. The set contains 2 bearings.
Static Load Rating 103,200 N; Dynamic Load Rating 105,000 N for the set (95,600 N per row, ISO); Limiting Speed 6,900 rpm grease and 12,400 rpm oil.
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