SA&SI series metric rod end bearings

SA/SI series metric rod end bearings offer economical and reliable articulation for general industrial linkages. With right-hand external and internal thread options, they support proper misalignment compensation and are widely applied in hydraulic cylinders, automation equipment and mechanical control systems.

Classification :

Rod End Bearings

Keywords :

rod end bearing, SA series rod end, SI series rod end, metric rod end, industrial rod end bearing, SA10 rod end, SA20 rod end, SI12 rod end, spherical rod end bearing, hydraulic cylinder rod end

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SA & SI Series Metric Rod End Bearings

Keywords: SA SI metric rod end bearing, metric rose joint, internal thread rod end, external thread ball joint, self lubricating articulated bearing, hydraulic cylinder connecting joint, balero rótula métrico, rótula rosca exterior interior maquinaria industrial

🎯 Product Introduction & Core Features

SA and SI series metric rod end bearings are standard metric size articulated rose joints, split into two core types: SA with internal thread and SI with external thread. Built-in self-lubricating PTFE composite sliding liner delivers low friction maintenance-free operation. Strong self-aligning performance absorbs installation misalignment and continuous vibration loads. Standard metric bore & thread sizes from M4 to M30, full stock for automation equipment, hydraulic cylinders, agricultural tractors, construction machinery and packaging machinery. No extra maintenance grease required for long-term outdoor working conditions.

(Español: Rótulas métricas serie SA y SI, rosca interior y exterior con revestimiento auto lubricante, aptas para cilindros hidráulicos y maquinaria agrícola.)

⚙️ Series Structural Difference

1. SI Series: External straight thread metric rod end bearing, install into mounting housing, general light & medium load swing linkage
2. SA Series: Internal straight thread metric rose joint, fit onto threaded shaft, widely used for cylinder end connection
Both series adopt standard short compact housing, common swing angle ±12°, interchangeable with global standard metric rod end parts.

🛠️ Main Application Scenarios

Pneumatic & hydraulic cylinder end connections, farm tractor control link arms, mini excavator steering assemblies, automated production line actuators, packaging machine swing mechanisms, metallurgical light transmission equipment, fitness equipment connecting rods, small robot articulated joints, logistics lifting equipment

Get Wholesale FOB Price For All SA & SI Metric Rod End Bearings

Full stock standard metric size short body external & internal thread rose joints with self-lubricating liner. Mixed batch small MOQ supported, OEM custom logo and neutral export packaging for machinery distributors worldwide.

(Español: Stock completo rótulas métricas SA SI rosca exterior e interior auto lubricantes, pedidos mixtos para distribuidores industriales.)

Request Bulk Quotation Browse Full Bearing Series & Download Dimension Chart

1. SI Series External Thread Metric Rod End Bearing Dimension Table

Model Number	External Thread	Bore d (mm)	Housing Width B	Thread Length	Industry Application	Spanish Search Term
SI4	M4	4	14	7	Mini automation micro linkage joint	rótula SI4 mini automatización
SI6	M6	6	19	9	Light pneumatic cylinder connecting end	rótula SI6 cilindro neumático ligero
SI8	M8	8	22	11	Tractor small control arm	SI8 brazo control tractor agrícola
SI10	M10	10	26	13	General industrial automation actuator	rodamiento SI10 automatización industrial
SI12	M12	12	30	15	Mini construction equipment swing joint	SI12 maquinaria obra pequeña
SI16	M16	16	38	19	Medium load hydraulic cylinder end	SI16 cilindro hidráulico carga media
SI20	M20	20	44	23	Large farm machinery connecting linkage	SI20 maquinaria agrícola pesada
SI30	M30	30	62	32	Heavy metallurgy transmission rod joint	SI30 transmisión metalúrgica

2. SA Series Internal Thread Metric Rod End Bearing Dimension Table

Model Number	Internal Thread	Bore d (mm)	Housing Width	Thread Depth	Working Equipment	Spanish Keyword
SA5	M5	5	16	8	Small test equipment articulated joint	rótula SA5 equipo de prueba pequeño
SA6	M6	6	19	9	Pneumatic cylinder internal thread end joint	SA6 extremo cilindro neumático rosca interior
SA10	M10	10	26	13	Packaging machine swing arm connection	SA10 brazo oscilante empaquetadora
SA16	M16	16	38	19	Light truck suspension linkage component	SA16 suspensión camión ligero
SA20	M20	20	44	23	Road roller steering connecting joint	SA20 dirección rodillo compactador
SA30	M30	30	62	32	Mining conveyor heavy load joint	SA30 transportadora minera carga pesada

Frequently Asked Questions About SA & SI Metric Rod End Bearings

1. What is the difference between SA and SI rod end bearings?

SI series is external straight thread metric rod end bearing, mounted into mounting base housing; SA series adopts internal thread, assembled onto external threaded shaft. Both standard short compact metric housing with identical swing angle range for interchangeable use.

(Español: Serie SI rosca exterior, serie SA rosca interior, ambos formato métrico compacto intercambiable.)

2. Are SA & SI rod ends maintenance free?

All SA and SI metric rod ends are fitted with self-lubricating PTFE composite liner, no regular grease filling needed, greatly reduce later maintenance cost for outdoor farm and construction machinery.

3. Can SA & SI replace other brands metric rose joints?

Full metric dimensions comply with ISO standard, 100% interchangeable with mainstream global brand metric rod end bearings, direct replacement without modifying installation structure.

4. Can I mix SA and SI different sizes in one wholesale order?

Mixed batch order supported, small quantity sample orders acceptable. All metric sizes M4-M30 in full stock, delivery within 3-7 working days after deposit confirmation.

5. What packaging options are available for export orders?

Single plastic bag independent packing, small neutral color box, pallet bulk packaging available, support OEM custom brand logo printing on boxes for global distributors.

Category Overview

Rod end bearings (heim joints / rose joints) are spherical plain bearings with an integrated threaded shank, designed to handle radial and axial loads while allowing angular misalignment. They are widely used in linkages, control systems, automotive, and machinery for flexible, reliable connection. Our products follow ISO 12240-4 standards, with durable steel construction, smooth operation, and long service life.

Our Series Breakdown

Series	Features	Typical Applications
POS & POSA Series	Male thread, steel body, lubrication groove, medium load, general industrial standard	Automation linkages, textile machinery, small agricultural equipment
PHS & PHSA Series	Female thread, compact design, good alignment ability, cost-effective	Automotive controls, valve linkages, fitness equipment, small machinery
SI Series (SA Series)	Male thread, heavy-duty, forged steel, high load & impact resistance	Hydraulic cylinders, construction machinery, truck linkages
SA & SAL Series	Female thread, heavy-duty, self-lubricating option, long service life	Engineering machinery, mining equipment, industrial linkages
JK Series	High-precision, low friction, corrosion-resistant optional	Precision instruments, automotive suspension, robotics

Core Advantages

Strong ability to compensate angular misalignment
High load capacity and shock resistance
Standard thread sizes for easy installation and replacement
Available with lubrication grooves for extended service life
Smooth operation, low noise, stable under vibration
Compatible with most industrial linkage systems

Typical Applications

Widely used in mechanical linkages, hydraulic cylinders, automotive steering & suspension, agricultural machinery, construction equipment, automation robots, textile machines, fitness equipment, and precision control systems.

PRODUCT TESTING

Bearing Forging

Bearing Annealing

Turning Process

Quenching

Bearing Assembly

Bearing Clearance Testing

Grease injection

Bearing Marking

Rod End Bearings