SKF7004-CD/P4ADGBSuper-Precision Angular Contact Ball Bearing 20x42x12 mm 15 Degree ABEC 7 Universal Matched Pair Light Preload

Product Description

What this part is:

A super-precision angular contact ball bearing in the 7004 size, supplied as a factory-matched universal pair. Bore 20 mm, outside diameter 42 mm, width 12 mm per bearing.

Decoding the designation:

7004 — ISO angular contact 70-series: 20 mm bore, 42 mm outside diameter, 12 mm width. The 70 series is the light section for this bore.

CD — 15° contact angle in the SKF super-precision scheme. The 25° counterpart carries an A prefix, as ACD.

P4A — SKF super-precision class: ISO class 4 dimensional accuracy with class 2 running accuracy, the grade the trade calls ABEC 7.

DGB — matched set, universally ground, light preload.

What these specs mean in practice:

The 15° contact angle and the light 70-series section put this at the high-speed, low-heat end of the range for a 20 mm shaft, with proportionally less thrust capacity than a 25° or heavier-section bearing. Light preload gives the set firm axial and radial stiffness while keeping friction and running temperature low for high-speed duty.

Quantity and configuration:

2 Pcs — one matched universal pair. The set can be arranged back-to-back, face-to-face or in tandem.

Mounting data:

The preload is ground into the ring faces. Alignment marks on the outer ring faces set the intended arrangement, and the two bearings stay together as a set.

Interchange guidance:

Same-envelope 7004 bearings in the ACD 25° design, or at the DGA and DGC preload grades, are related sizes rather than interchanges. The generic ISO shorthand for this size and angle is 7004 C. A 7204 is a heavier section on the same 20 mm bore, not a substitute.