MRC7224Single Row Angular Contact Ball Bearing 120x215x40 mm 29 Degree Contact Angle New Old Stock

Product Description

What this part is

A single row angular contact ball bearing in the 7224 envelope — 120 mm bore, 215 mm outside diameter, 40 mm width. A single row angular contact bearing takes radial load and thrust in one direction only, so it is normally used opposed against a second bearing or against a shoulder that handles the other direction.

Reading an MRC part number is not the same as reading an ISO one:
This is the point that matters most on this listing. MRC’s numbering is its own system, and applying another maker’s suffix logic to it produces wrong answers — MRC’s ZZ, for instance, means rubber seals, the opposite of the usual convention. On contact angle specifically: MRC published its single-row 7000 series as a 29° family in its own catalogue, whereas the modern SKF 7224 in B design is a 40° bearing. Those are genuinely different products sharing an envelope. The 29° figure here is read from MRC’s own 7000 series catalogue and should be treated as the MRC value, not as an ISO one; if your calculation is sensitive to contact angle, confirm against the ring marking or with SKF, who now hold the MRC line.

What these specs mean in practice

Contact angle is the trade at the heart of this bearing type. A shallower angle favours speed and radial capacity; a steeper one favours thrust capacity and axial stiffness at the cost of heat and speed. At 29° the MRC 7000 series sits between the high-speed 15° spindle bearings and the heavy-thrust 40° designs — a general-duty balance suited to pumps, gearboxes and large shaft assemblies rather than to high-rpm machine tool spindles. At 120 mm bore this is a substantial bearing and mounting practice matters: angular contact bearings are direction-sensitive and must be installed the right way round for the thrust they are meant to take.

Published ratings and mounting data

Dynamic and static load ratings and limiting speed are intentionally left blank. MRC is a discontinued marque and no current manufacturer table was located against this exact part number. The obvious temptation is to quote the SKF 7224 BCBM figures, but that is a 40° bearing with a machined brass cage — a different design whose ratings do not describe this part. Borrowing them would be a fabricated spec. If you need certified numbers, request them from SKF against the MRC part number.

About the AB3C5 suffix

The AB3C5 code carried in the part number is an MRC internal designation. No published MRC decode has been confirmed for it, so nothing is asserted about what it specifies — it is retained here as a search and ordering reference. Do not assume it denotes a precision class, a matched set or an internal clearance without confirming.

Quantity and configuration

One bearing. Single row, so it locates thrust in one direction only; if your application needs both directions constrained, you will need a second bearing opposed to it.

Condition and inspection

New old stock. As recorded in the condition notes, there is surface rust visible in the photographs. Surface rust on the outside of the rings is common on long-stored bearings and is generally cosmetic, but it is not automatically harmless — corrosion on a raceway or on a mounting seat is a different matter entirely. Review the photographs, and ask us for additional images of any surface you need to see before ordering.

Fitting notes

Install the bearing the correct way round for the thrust direction; a reversed angular contact bearing has almost no axial capacity in the direction you need it. Press only on the ring being fitted, never through the balls. Clean the shaft and housing seats and check them for size before mounting, and inspect the raceways and mating faces for corrosion before the bearing goes into service.

Interchange guidance

MRC was acquired by SKF, so enquiries route through SKF. The ISO envelope number is 7224 — 120 x 215 x 40 mm — and other makers’ 7224 bearings share those boundary dimensions. They do not necessarily share the contact angle, cage or clearance, and on this part the contact angle is exactly where they are likely to differ. Verify before substituting.