RHP7230CTDULP4-1/2PRSuper Precision Angular Contact Ball Bearing, Half Pair – 150 mm ID, 270 mm OD, 45 mm Width, 15° Contact Angle, P4, Light Preload, Open

Product Description

What this part is

RHP 7230CTDULP4-1/2PR super precision angular contact ball bearing. Bore: 150 mm (5.906 in). Outside diameter: 270 mm (10.630 in). Width: 45 mm (1.772 in). Series: 72, ISO dimension series 02. Single row, open, straight bore, universally faced. Manufactured in the United Kingdom.

Decoding the designation

Contact Angle: 15°. Cage: machined laminated phenolic resin, outer ring guided. Grouping: DU, paired unit. Preload: Light. Precision Grade: P4, equivalent to EP7, ABEC 7 and ISO Class 4. The -1/2PR suffix marks one half of a factory matched pair.

What these specs mean in practice

Dynamic Load Rating: 270 kN. Static Load Rating: 305 kN. Limiting speed: 8,000 rpm on oil/air lubrication and 5,100 rpm on grease. A 15° contact angle runs faster and carries less thrust than a 25°. The 72 section is the heavy choice at this bore, 270 mm outside diameter and 45 mm wide, and it carries the highest load ratings in the RHP super precision range at 150 mm. P4 holds tighter running accuracy, which lowers runout and vibration: inner ring radial runout 6 µm maximum, outer ring radial runout 10 µm maximum.

Preload and stiffness

Axial preload for a light-preload pair of this size and angle: 2,220 N. Axial stiffness at light preload: 222 N/µm. Light preload gives the lowest internal friction and heat generation of the four preload classes and the highest permissible speed. Preload is set at manufacture, so no internal clearance value applies.

Quantity and configuration

One bearing, one half of a factory matched light-preload pair. That suits a spindle rebuild where one half of an installed pair needs replacing, and it is the single-piece way into this envelope. Universal face control means the rings are pre-adjusted, so this piece pairs back-to-back, face-to-face or in tandem with another 7230CTDULP4 at the marked light preload without ground spacers.

Fitting notes

Inner ring abutment diameter d1: 164 mm minimum. Outer ring abutment diameters D1 and D2: 256 mm and 263 mm maximum. Fillet radii r and r1: 3.0 mm and 1.5 mm minimum. Effective load centre a: 50.6 mm. Lubrication jet pitch circle diameter: 196.5 mm. Internal free volume: 374.6 cm3. Recommended shaft fit for P4 at this diameter is a mean interference of 4 µm, and the locating housing fit a mean clearance of 10 µm. The high point of radial runout is marked with a burnished spot on the inner ring face and a V line on the outer ring outside diameter. Maximum recommended operating temperature: 120 °C. Rings and balls: SAE 52100 through-hardened chrome bearing steel. Mass: 10.034 kg (22.12 lb).

Interchange guidance

Carton designations: 7230CTDULP4-1/2PR, 7230CTDULP4, 7230-C-T-DUL-P4, 7230-C, B-7230-X2-TA-DUL-EP7, B-7230-T-P4S-DUL. NSK 7230CTRDULP4 is the current-scheme equivalent at 15° with the same outer-ring-guided phenolic cage. SKF 7230 CD/P4ADGA is a 15° light-preload equivalent. Fafnir 2MM230WI-DUL is the 15° Fafnir equivalent in the 72 envelope. Related sizes: Fafnir 2MM9130WICRDUL and B7030X2 are the 7030 envelope at 150 x 225 x 35 mm.