SI Spherical Rod End Bearings (Female Thread)

SI spherical rod end bearings are internally threaded spherical plain bearings designed for applications requiring angular misalignment, oscillating movement, and reliable radial load handling. These bearings are widely used in hydraulic cylinders, mechanical linkages, steering systems, and industrial equipment where compact installation and adjustability are required.

The SI design features a spherical plain bearing housed in a steel body with a female thread, allowing direct mounting onto threaded rods or piston rods while accommodating alignment variation during operation.

Key Features

• Female (internal) threaded rod end

• Spherical plain bearing insert

• Compensates for angular misalignment

• Compact and robust design

• Sealed (2RS) versions available for improved contamination resistance

Construction & Materials

• Hardened steel inner ring with spherical sliding surface

• Steel outer ring press-fitted into the rod end head

• High-strength steel housing with internal thread

• Elastomer sealing rings (on sealed versions) to retain lubrication and exclude dirt and moisture

Operating Conditions

• Load type: Radial loads with oscillating motion

• Motion: Pivoting and limited rotational movement

• Misalignment capability: Accommodates shaft and assembly misalignment

• Maintenance: Maintenance-free or greaseable depending on configuration

Typical Applications

• Hydraulic cylinder rod ends

• Adjustable mechanical linkages

• Steering and control systems

• Agricultural and construction equipment

• Industrial automation assemblies

Advantages of SI Rod End Bearings

• Easy installation onto threaded components

• Allows fine adjustment of linkage length

• Reduces stress caused by misalignment

• Reliable performance in dynamic operating conditions