MRC409RAngular Contact Ball Bearing – 45 mm ID, 120 mm OD, 29 mm Width, Open, 15° contact angle, ABEC 3.

Product Description

What this part is

MRC 409R is a single-row angular contact ball bearing in the 400 heavy series. The envelope is 45 mm bore × 120 mm outside diameter × 29 mm width. The rings are open, with no shield or seal. Rolling elements are chrome steel balls. Precision Class: ABEC 3.

Decoding the designation

Series: 400, the heavy section of the MRC angular contact range. The 400-R block steps 5 mm of bore per number, which places 409 at a 45 mm bore. Type letter R gives a 15° contact angle with a counterbored outer ring. Base Number: 409R. Bore / Shaft Size: 45 mm. Outside Diameter: 120 mm. Overall Width: 29 mm. Contact Angle: 15°.

What these specs mean in practice

The heavy series puts a larger ball complement and a thicker ring section on a given bore, so a 45 mm shaft carries a 120 mm outside diameter and 29 mm of width. That section length is what raises the radial and thrust capacity over a light-series bearing on the same shaft. A 15° contact angle carries less thrust and more speed than a 40° angle, and it locates the shaft closer to the radial line, which favours running accuracy and higher speed. The counterbored outer ring routes thrust through one shoulder, so each bearing takes axial load in one direction.

Quantity and configuration

One piece ships. Unit Quantity: 1. Number Of Rows: 1. The designation carries no duplex execution letters, so the bearing stands as a single mountable unit. Carton and ring markings read 409-R and 7409C.

Fitting notes

Bore Type: straight. Closure Type: open, so the bearing takes lubricant from the housing or from a fitted supply. Internal Clearance: CN, standard, with no factory preload built into the designation. Mounting Arrangement: single, universal to either direction of thrust depending on how the counterbored face is set.

Interchange guidance

The 400-R heavy series lands on the ISO 74xx boundary sizes, so a 7409-C is a genuine interchange for a 409R at 45 × 120 × 29 mm. Searchable variants: 409R, 409 R, 409-R, 7409C, 7409-C, 7409 C, MRC409R, ISO 7409.

Origin

Country of origin: United States.