What this part is:

MRC 7126KR DT matched angular contact ball bearing set. Bore: 130 mm. Outside diameter: 200 mm. Width: 33 mm per bearing. Contact angle: 15°. Precision: ABEC 5. Series: MRC 7100K, angular contact extra-light section. Ring form: counterbored outer ring, single row per bearing.

Decoding the designation:

7100K: angular contact, extra-light section. 26: bore code, multiplied by five for 130 mm. R: 15° contact angle with a counterbored outer ring. DT: matched pair for tandem mounting. ABEC 5: precision class. Carton and ring forms in circulation: 7126KRD1T, 7126KRDT, 7126 KR DT, 7126KR.

What these specs mean in practice:

Tandem mounting puts both bearings' contact lines in the same direction, so the pair shares one heavy thrust load between two rows instead of one. Thrust capacity roughly doubles against a single bearing while the direction stays one-way. A 15° contact angle holds speed capability up and gives high radial stiffness. The counterbored outer ring is what allows a full ball complement on one shoulder, which is where the thrust capacity comes from. ABEC 5 tightens bore, outside-diameter, width and runout tolerances over ABEC 3 and is the usual class for matched sets, because matched sets only hold their preload or end play if both rings are ground to the same tolerance.

Quantity and configuration:

Two bearings, supplied as the factory-matched DT tandem set. Stacked width across the pair: 66 mm.

Fitting notes:

Both bearings face the same way in a tandem stack, so the thrust faces sit against the load. Grinding is matched across the pair, which is why the two pieces stay together as one unit.

Interchange guidance:

The 7126K section sits on the ISO 7026 envelope, 130 x 200 x 33 mm. Same-size 15° equivalents in other schemes: SKF 7026 AC/DT, NSK 7026CDT, FAG 7026C.DT. MRC's own related types on the same envelope carry different contact angles and are not substitutes: 7126KU is 29° and 7126KP is 40°.