NTN7204CGGNP4Angular Contact Ball Bearing – 20 mm Bore, 47 mm OD, 14 mm Width, 15° Contact Angle, Open, P4 / ABEC 7, Universal Flush Ground

Product Description

What this part is

NTN 7204CG/GNP4 is a single-row angular contact ball bearing, 20 mm bore by 47 mm outside diameter by 14 mm width, open on both faces, ground to ABEC 7 running accuracy. It belongs to the 72 dimension series, the standard-section angular contact family.

Decoding the order code

The 72 gives the dimension series and 04 is the bore code, 04 × 5 = 20 mm. In the NTN scheme C denotes a 15° nominal contact angle. G marks the rings as universally flush ground, so two or more bearings of this designation stack directly against one another in any arrangement without a ground spacer. P4 is the precision class, equivalent to ABEC 7.

What these specs mean in practice

Contact angle sets the split between radial and axial capacity and the speed ceiling. A 15° angle carries less thrust than a 25° or 40° bearing of the same size, and in exchange runs faster and cooler, with lower ball-spin heat generation. That makes the 15° grade the usual choice for machine tool and high-speed spindle duty where radial stiffness and speed matter more than raw thrust. ABEC 7 tightens bore, outside diameter and raceway runout well beyond the ABEC 1 commercial grade, which is what holds spindle concentricity.

Duplex arrangements

Universal flush grinding means the ring faces are ground so that a back-to-back (DB) pair develops a defined preload, a face-to-face (DF) pair develops a defined preload with a shorter load span, and a tandem (DT) pair shares one-direction thrust between both bearings. A DB pair carries thrust in both directions and gives the highest moment stiffness of the three.

Quantity and configuration

One bearing, open on both faces, 20 mm cylindrical bore, 15° contact angle, P4 class, universally flush ground.

Fitting notes

Angular contact bearings are directional: the wide land of the outer ring faces the thrust load and the counterbore faces away from it. The wide-land face carries the designation marking. Operating temperature range up to 120 °C. Open faces suit grease, oil mist or oil-air lubrication.

Interchange guidance

SKF 7204 CD/P4A and FAG B7204-C-T-P4S share the 20 × 47 × 14 mm envelope and the 15° angle; the FAG carries a phenolic cage and the SKF a pressed-steel or phenolic execution depending on suffix, and cage material moves the speed ceiling. NSK 7204CTYNDULP4 is the equivalent in the NSK scheme, where C also denotes 15°. NTN 7204 and 7204B are the same envelope at 30° and 40° respectively — related sizes, not substitutes.