MRC208RDUAngular Contact Ball Bearing, Phenolic Cage – 40 mm Bore x 80 mm OD x 18 mm Width, 15°, ABEC 7, C3

Product Description

What this part is

MRC 208RDU single-row angular contact ball bearing with a counterbored outer ring and a phenolic cage, ground as a universal duplex half pair. Bore: 40 mm. Outside Diameter: 80 mm. Overall Width: 18 mm. Contact Angle: 15°. Precision Class: ABEC 7 (ISO Class 4). Internal Clearance: C3. Cage Material: Phenolic. Number Of Rows: 1. Rolling Elements: Balls. Bore Type: Straight. Closure Type: Open both faces. Material: Chrome steel. Dynamic Load Rating: 12,600 lbf (56.0 kN). Static Load Rating: 11,200 lbf (49.8 kN). Fillet Radius: 1 mm. Item weight: 0.88 lb (0.40 kg). GTIN: 097741004114. Unit Quantity: 1 Pc.

Decoding the designation

200 — MRC’s light series. Series: 200-RD is how MRC files this straight angular contact family.

08 — the bore code. Multiplied by five it gives Bore: 40 mm.

R — Contact Angle: 15°, with a counterbored outer ring. The counterbore admits a full ball complement past a low shoulder, and the high shoulder opposite carries the thrust.

DU — a duplex half pair, universally flush ground. Any two of this designation assemble back-to-back, face-to-face or tandem, and the flush grind sets the mounted condition directly at clamp-up.

What these specs mean in practice

Precision Class: ABEC 7 (ISO Class 4) is a spindle class. It holds bore and outside diameter to tight tolerance and holds radial and axial runout to a few microns, which is what keeps a tool tip or a grinding wheel where the drawing says it is. Cage Material: Phenolic is a fabric-base laminate, light and self-lubricating, and its low mass is what lets a precision bearing run fast without cage-generated heat. Contact Angle: 15° is the shallow end of the range and pairs naturally with that speed capability. Internal Clearance: C3 is wider than normal, sized for a tight shaft fit or a warm inner ring. Dynamic Load Rating: 12,600 lbf (56.0 kN). Static Load Rating: 11,200 lbf (49.8 kN). Bore: 40 mm. Outside Diameter: 80 mm. Overall Width: 18 mm. Item weight: 0.88 lb (0.40 kg).

Quantity and configuration

Unit Quantity: 1 Pc. One universally flush-ground duplex half pair, straight bore, open on both faces. Two assemble into a matched set in whichever of the three duplex orientations the application calls for.

Fitting notes

The high-shoulder side of the outer ring faces the thrust load, so the bearing is fitted with the counterbore turned away from the direction the axial force arrives from. Where two are paired, the marked ring faces are lined up so the flush grind closes at clamp-up. Fillet Radius: 1 mm sets the maximum corner radius the shaft and housing shoulders may carry. A phenolic cage is handled by the rings, never by the cage itself, and an ABEC 7 bearing expects ground and measured seats and clean handling.

Interchange guidance

40 x 80 x 18 mm is the 7208 envelope and the carton carries the 7208-C cross itself. A 7208 C is the 15° execution and matches on both angle and envelope, so an interchange reduces to class, cage and grind: the substitute has to be ABEC 7, phenolic-caged and universally flush ground to behave the same way in a paired mounting.

Searchable variants

208RDU, 208-RD-U, 208 RDU, 208 R DU, 7208-C, 7208C, MRC 208RDU.