SKFSuper-Precision Angular Contact Ball Bearing – 20 mm ID, 42 mm OD, 12 mm Width, Open, 25° Contact Angle, Medium Preload

Product Description

What this part is: SKF 7004 ACDGC/P4A single-row super-precision angular contact ball bearing. Series: 70. Bore: 20 mm. Outside diameter: 42 mm. Width: 12 mm. Contact Angle: 25°. Open on both faces. Country of origin: Italy. Searchable forms include 7004ACDGCP4A, 7004-ACD-GC-P4A and 7004 ACD GC P4A. Decoding the designation: ACD: high-capacity D design at a 25° contact angle. GC: universally matchable, medium preload. Precision Class: P4A, SKF’s super-precision class, equivalent to ABEC 7. The carton also carries the Fafnir equivalent 3MM9104WI CR SUH, in which 3MM confirms the 25° angle and CR the phenolic outer-ring land-riding cage. What these specs mean in practice: Dynamic Load Rating: 10.6 kN. Static Load Rating: 6.7 kN. Limiting Speed: 32,000 rpm. A 25° contact angle carries appreciably more thrust than a 15° bearing of the same size, and medium preload raises axial and radial stiffness over the lighter classes so the shaft deflects less under cutting load. Quantity and configuration: Universally matchable execution. Bearings of this designation combine back-to-back, face-to-face or in tandem without shims or grinding, and the preload of the finished arrangement follows from the GC class. Fitting notes: Straight bore on a cylindrical shaft seat. Preloaded execution, so Internal Clearance reads N/A. Cage: machined phenolic, riding on the outer ring land. Operating range: -40 °C to 120 °C. Interchange guidance: Base number: 7004. Closest first: Fafnir 3MM9104WI CR SUH (25°, phenolic outer-ring land-riding cage, heavy preload) and FAG B7004-E-T-P4S-UH (25°, P4, universal, heavy preload); both carry a heavier preload class than the GC medium preload of this bearing. SKF 7004 ACDGA/P4A is the extra light preload execution and 7004 CDGC/P4A carries a 15° contact angle — each a related size rather than a direct substitution.