What are the differences between mounted and unmounted spherical roller bearings?

TIME：2026-02-25

I. Structural Differences

1. Unmounted: Only the bearing body is present.

· It's a single spherical roller bearing.

· You need to purchase the bearing housing, end cap, and seal separately.

· It can be installed separately in the user's own housing or bracket.

2. Mounted: Bearing + housing integrated (bearing housing unit)

· The bearing is pre-installed in a cast iron/stamped steel housing.

· The housing comes with mounting holes, grease fittings, and seals.

· It can be directly bolted on after purchase.

II. Performance Differences

Item	Unmounted	Mounted
Installation	Complex, requires machining housing holes	Simple, bolted on
Alignment	Depends on installation accuracy	Self-aligning
Sealing	Requires additional parts	Integrated sealing is better
Rigidity	Depends on the housing	Cast iron housing has high rigidity
Cost	Bearing is cheaper, but machining is expensive	Overall, cheaper and easier

III. Application Scenarios (Most Crucial)

1. Unmounted — 1. For use in internal equipment and precision mechanisms:

○ Gearboxes, reducers, pump bodies, machine tool accessories

○ Internally integrated by the equipment manufacturer; the outer casing is part of the complete machine

○ Small space, compact structure, requiring precise fit

2. With mounting bracket – For drive shafts, outdoor/simple frames

○ Agricultural machinery: harvesters, tractors, seeders

○ Conveying equipment: belt conveyors, rollers, assembly lines

○ Fans, mixers, textile machinery, woodworking machinery

○ Features: Shafts are prone to deformation, installation misalignment, harsh environments; the outer spherical surface of the mounting bracket relies on self-aligning to compensate for misalignment; dust-resistant and vibration-resistant.

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