SNFAEX30-7CE1DULSuper-Precision Angular Contact Ball Bearing Duplex Set – 30 mm ID, 55 mm OD, 13 mm Width, 15° Contact Angle, Light Preload, Open, ABEC 7

Product Description

What this part is: SNFA EX30-7CE1DUL super-precision angular contact ball bearings, supplied as a universally matchable duplex set. Bore 30 mm, outside diameter 55 mm, width 13 mm each — the ISO 7006 envelope. Single row each, open on both faces. Decoding the designation: EX is SNFA’s super-precision angular contact series. 30 is the bore in millimetres and the following 7 is the tolerance class, ABEC 7. CE identifies the internal design and machined cage execution. The digit 1 is the contact angle code, 15°. DUL is a universally matchable duplex set at light preload. What these specs mean in practice: A 15° contact angle favours speed and radial stiffness over thrust capacity; a 25° execution in the same envelope trades speed for axial load. Light preload is the high-speed end of the preload range, giving the lowest heat generation and the highest permissible speed at lower axial stiffness than a medium or heavy set. Quantity and configuration: 2 Pcs, supplied as a duplex set. The rings are ground for universal matchability, so the pair develops the published light preload when clamped adjacent, and further bearings of the same designation can be added to the stack. Fitting notes: Preloaded bearings are supplied without radial internal clearance, so a clearance class does not apply. Brand lineage: SNFA is a French super-precision bearing maker, now part of the SKF group. Its EX series maps directly onto the ISO 70 dimension series, so an EX30-7 sits in the same 30 x 55 x 13 mm envelope as a 7006. Interchange guidance: Same-envelope 15° light-preload super-precision duplex sets from other makers are listed in the cross-reference attributes. A 25° execution, or a medium or heavy preload set, in the same envelope is a related size rather than an interchange.