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.
Post time: Feb-25-2026
