DodgeF2B-GTM-103 / 129331Two-Bolt Cast Iron Flange Ball Bearing Unit – 1-3/16 in Bore, Grip-Tight Adapter Mount, Medium Duty

Product Description

What this part is

Dodge F2B-GTM-103, Dodge item number 129331, is a two-bolt flange ball bearing unit with a Grip-Tight adapter mount. Bearing Type: Mounted single-row ball bearing insert in a flange housing. Housing Style: Two-bolt flange, cast iron. Bore / Shaft Size: 1-3/16 in (30.16 mm). Locking Method: Grip-Tight concentric adapter, push/pull design. Duty: Medium. Rolling Elements: Steel balls. Number Of Rows: 1.

Decoding the designation

F2B — two-bolt flange housing, bolted flat to a vertical face with the shaft running perpendicular through it.

GT — Grip-Tight adapter mount, a tapered adapter sleeve drawn up inside the insert so the bearing clamps concentrically all the way round the shaft.

M — medium duty, a heavier insert and housing section than the normal-duty GT build at the same bore.

103 — bore code for a 1-3/16 in shaft.

What these specs mean in practice

Locking Method: Grip-Tight concentric adapter. The adapter contacts the shaft over a full 360° rather than at two setscrew points, so it centres the bearing accurately, transmits higher torque before slipping and leaves the shaft unmarked when the unit is drawn off. That combination is what makes a Grip-Tight the choice on reversing drives, vibrating equipment and shafts that will be reused. The wide inner ring gives the adapter length to grip, and the insert’s spherical outside diameter seats in a matching housing bore to take up initial shaft misalignment.

Housing style and bolt pattern

Housing Style: Two-bolt flange, cast iron. The two fixing holes sit either side of the bore on a single line, so the unit lands flat against a bulkhead, gearcase wall or conveyor end plate.

Fitting notes

The adapter is drawn onto the shaft with its locknut, which expands the grip progressively, and released by backing the nut off against the push-off feature. Relubrication: grease fitting in the housing.

Quantity and configuration

Unit Quantity: 1 Pc. Complete flange unit — cast iron housing with the Grip-Tight ball insert and its adapter fitted.

Interchange guidance

Part Number: F2B-GTM-103. Base Number: 129331. Searchable variants: F2BGTM103, F2B GTM 103, F2B-GTM103. The four-bolt flange at the same bore and duty is the Dodge F4B-GTM-103, item 129681. The normal-duty two-bolt build in the same family is the F2B-GT series.