SKF7004ACDGCP4ASuper-Precision Angular Contact Ball Bearing – 20 mm ID, 42 mm OD, 12 mm Width, Open, 25° Contact Angle, Heavy 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: heavy preload, the top step of SKF’s preload ladder for universally matchable bearings. 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, SUH the heavy preload 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 heavy preload raises axial and radial stiffness so the shaft deflects less under cutting load. Both choices trade speed for rigidity, which is why this execution sits at a fixed, load-carrying spindle position. 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. FAG equivalent: B7004-E-T-P4S-UH. Fafnir equivalent: 3MM9104WI CR SUH. SKF 7004 ACDGA/P4A and 7004 ACDGB/P4A are the light and medium preload classes on the same 20 x 42 x 12 mm envelope, and 7004 CDGC/P4A carries a 15° contact angle — each a related size rather than a direct substitution.