MRCR18FFDeep Groove Ball Bearing – 1-1/8 in Bore x 2-1/8 in OD x 1/2 in Wide, Shields Both Sides, Three-Piece Lot

Product Description

What this part is

MRC R18FF single-row deep groove ball bearing, inch series, shielded on both faces. Bore Diameter: 1.1250 in. Outside Diameter: 2.1250 in. Overall Width: 0.5000 in. In metric the envelope measures 28.575 x 53.975 x 12.700 mm. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Shields both sides. Cage Material: Pressed steel. Cage Type: Pressed, ball-guided. Bearing Material: Chrome steel. Internal Clearance: CN. Series: MRC R inch. GTIN: 097741021524.

Decoding the designation

R — the leading R marks MRC’s small inch series, in which the bore, outside diameter and width are inch dimensions. It is a series marker, not a contact-angle code.

18 — the inch-series size number for a 1-1/8 in bore in a 2-1/8 in housing.

FF — two metal shields. On MRC, F and FF are shields and Z and ZZ are rubber seals, the reverse of the NSK, SKF and FAG convention, which is why the carton also carries the R18ZZ cross.

What these specs mean in practice

Dynamic Load Rating: 8,180 N, which is 1,840 lbf. Static Load Rating: 5,450 N, which is 1,225 lbf. The dynamic figure sets rating life under rotation; the static figure sets the load the raceways carry at rest or under shock without permanent indentation.

Metal shields run with a small clearance at the inner ring land rather than rubbing on it, so they add almost no running torque and cost the bearing very little speed, while holding the grease charge in and keeping coarse contamination out.

Deep groove Conrad construction, so both raceway shoulders are unbroken and the bearing takes thrust in either direction alongside its radial load.

Internal Clearance: CN. Standard radial clearance for an ordinary interference fit on the shaft.

Mounting data

Bore Type: Straight, 1.1250 in shaft seat. Housing bore 2.1250 in. Overall Width: 0.5000 in across the rings, which is the closed-execution width for this size.

Quantity and configuration

Unit Quantity: 3 Pcs. Three individual bearings, each shielded both sides, supplied as one lot.

Interchange guidance

R18 is a standardised inch-series number, so the makers below use the same designation on the same 1-1/8 x 2-1/8 x 1/2 in envelope and interchange directly in the same housing bore and shaft seat. Searchable variants of the number: R18FF, R18-FF, R18 FF, R18ZZ, R18-2Z, R-18-ZZ.