SNFAVEX25-9CE1THigh-Speed Spindle Bearing 25x47x12 mm, Hybrid Silicon-Nitride Ceramic Balls, 15 Degree Contact Angle, ABEC 9, Outer-Ring-Guided Phenolic Cage, Open

Product Description

What this part is

SNFA VEX25/NS9CE1 high-speed machine tool spindle bearing. Brand: SNFA (SKF). Bore: 25 mm. Outside Diameter: 47 mm. Overall Width: 12 mm. Contact Angle: 15°. Precision Class: ABEC 9 (ISO P2). Running Accuracy: P2. Cage Material: Phenolic resin, externally located on the outer ring. Rolling Elements: Silicon-nitride ceramic balls, hybrid construction. Bearing Material: Steel rings with silicon-nitride ceramic balls. Closure Type: Open. Bore Type: Straight. Number Of Rows: Single row. Preload: Light. Mounting Arrangement: Universal. Series: VEX, ISO 10 dimension series, 70xx envelope. Base Number: VEX 25. Design Units: Metric. Item Weight: 0.17 lbs. Harmonization Code: 8482.10.50.

Hybrid ceramic construction

The NS in the designation denotes silicon-nitride ceramic balls. Ceramic balls run at roughly 40 percent the density of steel, lowering centrifugal loading on the cage and outer raceway at speed and raising the usable rpm ceiling. They are harder and stiffer than steel, giving lower contact deflection and higher spindle stiffness for the same preload, and they expand less and conduct heat more poorly, holding preload steadier as the bearing warms. Silicon nitride is electrically non-conductive, the standard remedy for electrical pitting on motorised spindles.

Decoding the designation

VE is SNFA’s high-speed spindle bearing form. X is the ISO 10 dimension series, the 70xx envelope. 25 is the bore in millimetres. NS denotes the silicon-nitride ceramic balls. 9 is precision class ABEC 9. C is a phenolic resin cage. E denotes the cage located externally, guided on the outer ring. The trailing 1 is the 15° contact angle. Searchable variants of the marked number: VEX25/NS9CE1, VEX25-9CE1T, VEX 25 /NS 9CE1, VEX25 9CE1, VEX25NS9CE1.

What these specs mean in practice

Dynamic Load Rating: 8.40 kN (840 daN) at 15°. Static Load Rating: 3.60 kN (360 daN) at 15°. Limiting Speed: 84,000 rpm, single bearing, spring preload, oil lubrication. Max Temp: 100 °C. Min Temp: -30 °C. Chamfer r minimum 0.6 mm, R minimum 0.3 mm. A 15° contact angle favours speed and radial running accuracy over thrust capacity, which is what puts this bearing at the top of the spindle range. ABEC 9 is the tightest running-accuracy class in general machine tool use, and it pairs with shaft and housing seats ground to matching tolerance.

Interchange guidance

Envelope equivalents at 15° in the 25 x 47 x 12 size include the all-steel 7005C in ISO format and B7005-C-T-P4S in Schaeffler format, both steel-ball executions at P4. The like-for-like replacement is a hybrid ceramic ABEC 9 bearing in this envelope, the direct SKF descendant of the SNFA VEX range. VEX25/S/NS9CE1 is the sealed hybrid variant of the same size.