September 22, 2026
SI..ES-2RS Female Thread Rod End Bearings
Compare SI..ES-2RS relubricatable rod end bearings vs maintenance-free rod end models. Learn load ratings, swing angles, sealing characteristics, lubrication requirements and selection tips for heavy-duty machinery, automation equipment and hydraulic systems.
SI..ES-2RS female thread rod end bearings are heavy-duty articulated components widely used for mechanical linkage joints under heavy static, alternating and impact loads. This is SI..ES-2RS female thread rod end bearing. It consists of rod end body and spherical plain bearing GE.E or GE..ES. The body is carbon steel, zinc plated. It features self-alignment, relubricatable via a nipple or hole on the rod end. Equipped with 2RS double-sided seals, it blocks dust, splashing water and contaminants from entering the spherical sliding contact surface, protecting the internal spherical plain bearing during oscillating and tilting motion. Ideal for heavy static, alternating and impact loads. Widely used in machinery, automation and hydraulic systems. We supply full sizes and support custom requirements.
A frequent question from design engineers: When should I select SI..ES-2RS relubricatable rod end bearings instead of maintenance-free rod end bearings such as the SI..TK series?
Bearing selection should never depend purely on component procurement price. It is determined by actual load conditions, operating cycle frequency, ambient environment and long-term equipment maintenance plans. This guide elaborates on the core structure, sealing design, professional performance parameters, typical application scenarios and practical selection tips of SI..ES-2RS rod end bearings, helping mechanical designers quickly verify whether this heavy-duty relubricatable bearing model fits their mechanical projects.
An SI..ES-2RS female thread rod end bearing is assembled from carbon steel zinc-plated rod end housing and built-in GE.E or GE..ES spherical plain bearing. The spherical insert enables multi-directional tilt, swing and rotation to compensate installation misalignment and dynamic angular displacement during equipment operation. The 2RS double lip seals on both sides shield the sliding pair from external debris and liquid splashes. With grease nipple or lubrication hole on rod end body, users can replenish grease regularly to maintain low friction and extend service life, which makes it perfect for heavy load and impact working conditions.
· Female thread structure for convenient assembly in linkage mechanisms
· Zinc-plated carbon steel rod end body: high mechanical strength and basic anti-corrosion property
· Built-in GE.E / GE..ES spherical plain bearing, steel-on-steel sliding contact
· 2RS double-side sealing structure: prevents dust and splash water intrusion
· Self-aligning capability: compensates shaft misalignment and assembly offset
· Relubricatable design: grease can be refilled via nipple or hole on rod end
· Excellent load capacity: withstands heavy static load, alternating load and impact load
· Full size availability and custom processing service supported
SI..ES-2RS rod end bearings are perfectly suited for:
· Hydraulic cylinder articulated joints with heavy load and impact force
· Heavy industrial machinery, construction equipment and transmission linkages
· Automation systems with large alternating loads and oscillating motion
· Indoor industrial equipment where periodic lubrication maintenance is available
· Mechanical joints requiring double-side sealing against dust and water splashing
SI..ES-2RS series focuses on heavy load carrying capacity and impact resistance. It is optimized for working environments where regular maintenance and grease replenishment can be performed. It is not recommended for totally unattended equipment, highly corrosive environments or applications where maintenance access is impossible.
The core advantage of SI..ES-2RS rod end bearings is outstanding heavy-load and impact-resistant performance with sealed protection. Design engineers must evaluate dynamic load capacity and actual swing angle rather than only referring to static load data during model selection.
SI..ES-2RS rod end bearings core parameters: Maximum permissible swing angle: 12° ~15° Static load capacity: 25 kN ~420 kN (varies by specific specification) Dynamic load capacity:12 kN ~180 kN (varies by specific specification)
The steel-to-steel spherical sliding pair can sustain continuous alternating load and intermittent impact. The 2RS seals reduce contamination ingress effectively. Regular grease replenishment keeps friction stable and avoids premature wear on spherical surfaces. Field tests confirm that with proper lubrication, SI..ES-2RS maintains stable performance under repeated heavy impact.
SI..ES-2RS is designed as relubricatable heavy-duty rod end bearing:
· Grease can be injected through the grease nipple or lubrication hole on rod end housing
· 2RS double lip seals reduce dust and splash contamination, but cannot fully block heavy dust immersion
· Recommended inspection & lubrication cycle: refill grease every 200–400 operating hours under heavy load
· Clean grease fitting before refilling to prevent impurity entering the sliding surface
· Note: 2RS seals are splash-proof, not fully waterproof for continuous immersion. Long-term exposure to heavy dust will accelerate wear even with sealing.
SI..ES-2RS rod end housing adopts carbon steel with zinc plating for good strength and moderate rust resistance. The internal GE.E / GE..ES spherical plain bearing is steel-on-steel sliding pair. Working temperature range: -30℃ ~ +120℃
It works well in general indoor industrial environments with dust and occasional water splash. For persistent salt spray, strong acid and heavy corrosion environments, stainless steel rod end series such as SS POS is recommended instead.
SI..ES-2RS adopts standard female thread structure for mechanical linkage assembly. Ensure coaxial alignment during installation; avoid forced offset mounting to prevent concentrated stress on spherical surface. Do not exceed the rated maximum swing angle to prevent edge wear and local deformation. Prohibit hammering or violent impact directly on rod end body during installation. Keep grease nipple accessible for future lubrication after installation.
With steel spherical sliding pair and 2RS sealing structure, SI..ES-2RS transfers heavy load while absorbing partial vibration at articulated joints. Proper lubrication keeps friction noise low. Without timely grease replenishment, friction and running noise will rise rapidly and accelerate bearing wear.
SI..ES-2RS relubricatable rod end bearings have a slightly higher initial cost than SI..TK maintenance-free rod ends of same bore size. However, SI..ES-2RS delivers much higher static and dynamic load capacity and superior impact resistance, suitable for heavy-duty working conditions where SI..TK cannot withstand.
In comparison, SI..TK carbon steel maintenance-free rod ends need no grease refilling, fit light-to-medium load indoor applications. But its self-lubricating liner cannot survive long-term heavy impact and heavy alternating loads.
Choose SI..ES-2RS rod end bearings if:
· Working condition features heavy static load, alternating load or impact load
· Equipment allows regular maintenance and grease refilling
· Joint position needs 2RS double-side seal against dust and liquid splash
· Applied in hydraulic systems, heavy machinery and heavy-duty automation linkages
Choose SI..TK maintenance-free rod end bearings if:
· Light to medium load, no heavy impact
· Hard to carry out regular lubrication maintenance
· Dry indoor environment with low contamination level
More and more mechanical design engineers and equipment manufacturers select SI..ES-2RS female thread rod end bearings for hydraulic cylinders, heavy machinery and industrial automation projects. Featuring zinc-plated carbon steel housing, built-in GE.E / GE..ES spherical plain bearing, 2RS double sealing and relubricatable structure, this series delivers reliable heavy-load performance and dust protection. It serves as a robust articulated joint solution for heavy-duty mechanical linkage systems.
Q: What is the construction of SI..ES-2RS rod end bearing? A: This is SI..ES-2RS female thread rod end bearing. It consists of rod end body and spherical plain bearing GE.E or GE..ES. The body is carbon steel, zinc plated. It has 2RS seals on both sides and can be relubricated via nipple or lubrication hole.
Q: What is the load characteristic of SI..ES-2RS? A: It is ideal for heavy static, alternating and impact loads, widely used in machinery, automation and hydraulic systems. Load values differ according to different sizes.
Q: Does SI..ES-2RS need regular lubrication? A: Yes, it is relubricatable type. You can refill grease via grease nipple or hole on rod end to extend bearing service life.
Q: What environments are suitable for SI..ES-2RS? A: Suitable for general indoor heavy-duty industrial conditions with dust and water splash. Not fit for severe corrosive environment or continuous water immersion.
The selection of SI..ES-2RS rod end bearings is determined by actual load magnitude, swing angle, contamination level and equipment maintenance schedule. The SI..ES-2RS series has irreplaceable advantages for heavy-load, impact-resistant articulated joints where maintenance access is available. Mastering its sealing, lubrication and load characteristics helps designers pick the right heavy-duty rod end bearing for hydraulic and industrial machinery linkage structures.
We manufacture a full range of stainless steel and carbon steel rod end bearings and spherical plain bearings with mature production technology and strict quality inspection system. Our engineering team focuses on material structure optimization, precision machining and process customization. We supply full sizes and support custom requirements, delivering high-performance, cost-effective bearing solutions for global heavy machinery, hydraulic, automation and construction industry customers.
