SNFAEX105-7CE1DUFSuper Precision Angular Contact Ball Bearing Duplex Pair – 105 mm ID, 160 mm OD, 26 mm Width, Open, 15 Degree, Heavy Preload, ABEC 7

Product Description

What this part is:

SNFA EX105-7CE1DUF, super precision single-row angular contact ball bearings supplied as a universally matchable duplex pair. Bore: 105 mm. Outside diameter: 160 mm. Width: 26 mm per bearing. Contact angle: 15°. Bore form: straight, cylindrical. Closure: open. ISO equivalent designation: 7021 C. Country of origin: United Kingdom.

Decoding the designation:

EX is the SNFA super precision spindle bearing series. 105 is the bore in millimetres. CE1 sets the contact angle at 15°. DU is a universally matchable duplex set. Preload: heavy.

Published specifications:

Dynamic load rating: 105 kN (23,605 lbf). Static load rating: 102 kN (22,930 lbf). Limiting speed: 8,000 rpm. Precision class: P4 / ABEC 7. Preload: heavy. Cage material: phenolic. Cage type: machined. Operating temperature range: -20 to 120 °C. Lubrication: oil. Material: bearing steel. Weight: 4.30 lb (1.95 kg).

What a 15 degree contact angle buys:

At 15° the ball contact line sits close to the radial plane, so the bearing runs faster and cooler than a 25° execution of the same size and carries less thrust for a given preload. That is the trade a spindle designer makes: 15° for speed and radial stiffness, 25° where axial cutting force dominates. The 8,000 rpm figure on a 105 mm bore follows from that angle together with the phenolic cage.

Cage and preload:

The machined phenolic cage is lighter than brass and its fabric-base laminate holds oil, which lowers cage inertia and running temperature at speed, with a 120 °C ceiling. Heavy preload removes all axial play and gives the highest axial and radial stiffness of the preload ladder, so the spindle holds position under reversing cut load. Because the set is preloaded, internal clearance does not apply.

Quantity and configuration:

Two bearings, the matched duplex pair. The universally matchable ground faces mean the pair reaches its rated preload when clamped up, with no shims and no measurement at assembly.

Interchange guidance:

Same envelope, same 15° angle, same heavy preload: SKF 7021 CD/P4ADGC, where DGC is SKF’s heavy preload class; Fafnir 2MM9121WI DUH, where 2MM is 15° and 9121 maps to ISO 7021; NSK 7021CTRDUHP4Y, where C is 15° and TR is an outer-ring-guided phenolic cage matching this part’s cage; and FAG B7021-C-T-P4S-DUH, where the C gives 15° and T is a phenolic cage. Searchable variants: EX-105-7-CE-1-DUF, EX 105-7 CE 1 DUF, EX105-7CE1DUH, 7021C DUH, 7021-C, 2MM-9121 DUH.