SKF7215CATCC78Single Row Angular Contact Ball Bearing 75x130x25 mm, Open, Metric 72 Series

Product Description

What this part is

A single-row angular contact ball bearing in the metric 7200 series, 75 mm bore × 130 mm outside diameter × 25 mm width, open construction. Angular contact ball bearings take radial load together with axial load in one direction. Because the raceways are offset, the bearing cannot locate a shaft on its own — it has to work against an opposing bearing, either a second angular contact unit or a separate locating bearing at the far end of the shaft.

Decoding the designation

7215 – ISO base number for the single-row angular contact ball bearing with the 75 × 130 × 25 mm envelope. The dimensions in the title check out against this base number.
CA – on SKF angular contact ball bearings the letter A or the CA form generally indicates a specific internal design rather than a plain contact angle code. SKF’s published system defines a plain C suffix as a 15° nominal contact angle, but the CA / CATC form is not confirmed to share that 15° angle, so no contact angle is asserted here as fact.
TC / C78 – legacy SKF US suffixes of the kind inherited from the MRC bearing line. They do not appear in the current published SKF catalogue and no manufacturer definition could be located, so they are not translated into a preload, tolerance or clearance value. They are retained as carton markings and search terms.

What these specs mean in practice

Contact angle is the single most consequential variable on an angular contact bearing, which is why it is left unstated here rather than guessed. A shallow angle around 15° favours speed and radial stiffness and gives up axial capacity; a steep angle around 40° does the reverse. Fit a shallow-angle bearing where the design assumed a steep one and the thrust face runs overloaded; fit a steep one where a shallow one belonged and you lose speed capability and add friction and heat. If the contact angle matters to your build — and on a spindle it always does — the physical bearing needs to be identified against the original machine drawing rather than inferred from a legacy suffix.

Published ratings and mounting data

Basic dynamic load rating, basic static load rating, limiting speed, cage material, precision class and preload are left blank. The CATC / C78 suffix combination is not in the published SKF catalogue, so the internal design of this exact variant is unconfirmed, and the ratings of a current-catalogue 7215 variant would be a borrowed number rather than a specification for this bearing. What is stated with confidence: type, single row, open, and the 75 × 130 × 25 mm envelope.

Quantity and configuration

Two bearings on hand. They are stocked as individual pieces and are not represented as a factory-matched or preloaded duplex set. A duplex mounting requires bearings matched by the manufacturer for preload and flush faces; two unmatched singles will not deliver a specified preload even if they are the same part number.

Fitting notes

Each ring has one high and one low shoulder, so the bearing is orientation-sensitive — installed backwards it carries thrust the wrong way and fails early. Press only against the ring being mounted so no load passes through the ball complement. Open bearings arrive with a preservative coating rather than a working lubricant; grease or oil to the machine builder’s specification before running.

Interchange guidance

The 7215 base number and its 75 × 130 × 25 mm envelope are common to all the major manufacturers, so a substitute will fit the seat. Contact angle, cage type and precision class are what vary, and those decide whether the substitute performs the same. The MRC bearing line was acquired by SKF, which is the origin of these legacy US suffix forms.