DodgeF4B-SC-101Four-Bolt Square Flange Ball Bearing Unit — 1-1/16 in Bore, 206 Series, Setscrew Lock, Non-Expansion, 3-1/4 in Bolt Centres

Product Description

What this part is

A Dodge F4B-SC-101 mounted ball bearing unit: a four-bolt square flange housing in cast iron carrying a 206-series wide-inner-ring ball bearing insert with a 1-1/16 in bore. The insert’s outer ring is spherical and seats in a matching spherical bore in the housing, so the bearing self-aligns to compensate for shaft misalignment and frame deflection.

Decoding the designation

F4B is the Dodge housing style code and it is the part of the number that matters most: F for flange, 4B for four-bolt. That is not the same product as an F2B, which is a two-bolt flange with a different bolt pattern and footprint — bolt count is part of the housing style, so an F2B will not drop into an F4B hole pattern. SC is the locking and insert code: setscrew locking on a standard-duty ball insert. 101 is the bore code, 1-1/16 in. Dodge item number 124218 is the same part under Dodge’s numeric ordering system, and the number is also written F4BSC101 and F4B SC 101.

Scope — what is in the box

The complete unit: cast iron housing plus the 206-series ball insert, its setscrews and its seals, ready to bolt on and clamp to the shaft. This is not a housing-only or insert-only item, and no shaft, no adapter sleeve and no mounting bolts are included. If you are replacing only the rolling element, the corresponding standalone insert is the part to order.

Published ratings and mounting data

Housing style: four-bolt square flange (F4B)Shaft size: 1-1/16 in (26.99 mm)Insert series: 206 wide inner ring ballLocking method: 65° setscrews in the extended inner ringExpansion: non-expansion (fixed) — locates the shaft axiallyHousing material: cast ironSeal: DualGuard nitrile seal, both sidesBolt centre to centre: 3-1/4 in (82.55 mm)Overall flange size: 4-1/4 in (107.95 mm)Overall depth: 1.56 in (39.6 mm)Dynamic load rating: 4,368 lbf (19.4 kN)Static load rating: 2,538 lbf (11.3 kN)Maximum speed: 6,500 rpmRelubrication: greasableDodge item number: 124218

What these specs mean in practice

The two dimensions to check before you buy are the ones a buyer measures off an existing frame: 3-1/4 in bolt centre to centre and a 4-1/4 in overall flange. Get those right and the unit bolts straight onto the existing four holes. Setscrew locking is quick and works well on a clean, unhardened shaft turning in one direction; on a reversing or shock-loaded drive the setscrews can walk, and an eccentric collar or a concentric clamp insert is the better locking method. Non-expansion means this unit fixes the shaft axially, so on a two-bearing shaft only one end should be a non-expansion unit — using two fixed units on a long shaft that heats up will preload the bearings against each other and fail them. The 206 insert with a self-aligning spherical outer will absorb static misalignment from an out-of-square frame face, but it is not a substitute for a shaft that is bent or a housing face that is not flat.

Fitting notes

Bolt the flange to a flat, clean machined face — the spherical seat handles angular misalignment of the shaft, not a warped mounting face. Bring the shaft into position, then tighten the two setscrews evenly to the recommended torque; they bite into the shaft and leave a mark, so plan the shaft position before final tightening. Purge fresh grease through the fitting while the shaft turns slowly and check that grease appears at both seals.

Interchange guidance

Dodge, SealMaster and Link-Belt are all Regal Rexnord brands and Dodge mounted bearings now trade as Dodge Industrial under RBC Bearings, so buyers legitimately search this part under both Baldor Dodge and Dodge Industrial. Within Dodge, the same bore in a two-bolt flange is F2B-SC-101 and in a pillow block is P2B-SC-101 — those are different housing styles, not equivalents. The number 124218 is the Dodge item code for this exact build; a different item code on the same F4B-SC-101 designation usually means a different seal or insert option, so match the item number when the application is critical.