FafnirGC1203KRRG2Wide Inner Ring Insert Ball Bearing, 2-3/16 in Bore, Concentric Locking Collar, Snap Ring

Product Description

What this part is

A Fafnir GC1203KRRG2 wide-inner-ring insert ball bearing for a 2-3/16 in shaft, supplied with its concentric locking collar and outer-ring snap ring. Insert bearing only, no housing.

Decoding the designation

The GC prefix marks a relubricatable wide-inner-ring insert built for a concentric locking collar, against the plain G prefix used for the eccentric cam-collar version. 1203 encodes the bore in sixteenths of an inch above two inches, giving 2-3/16 in. KRR denotes the wide inner ring with Mechani-Seal positive-contact seals on both faces. The G suffix adds a snap-ring groove and retaining ring on the outside diameter of the outer ring. The trailing 2 marks the latest internal construction change, with overall dimensions unchanged from the base number.

What these specs mean in practice

The extended inner ring gives the collar a seat and lets the bearing run on plain commercial shafting rather than a ground journal. A concentric collar clamps square to the shaft on two setscrews, so it grips the same in either direction of rotation and introduces no angular offset. The snap ring in the outer-ring groove axially locates the insert in a through-bored housing or tube, which is what allows the same insert to be used in a bore that has no shoulder. Positive-contact seals hold grease and exclude dust and washdown, at a small friction and speed cost against a non-contact shield.

Published specifications

Bore: 2-3/16 in (55.56 mm)
Bearing type: single-row ball, wide inner ring, spherical outer surface
Closure: Mechani-Seal contact seals, both faces
Outer-ring retention: snap-ring groove and retaining ring
Locking: concentric collar, two setscrews
Relubrication: grease fitting in the outer ring

Quantity and configuration

Insert bearing, concentric locking collar and snap ring. 1 Pc.

Fitting notes

The insert drops into a housing bore or a bored tube and is located by the snap ring seated in its groove. The collar is slid onto the extended inner ring and its setscrews tightened in sequence.

Interchange guidance

G1203KRRB is the eccentric cam-collar counterpart in the same envelope and bore, a related size with a different locking method. Fafnir Industrial-series concentric-collar housed units in the 2-3/16 in shaft size — the RCJTC two-bolt flange and RASC pillow block families — take this insert class.