KJ12D: Rod End Joint – Flexible Connection Expert for Cylinder Mounting

Product Positioning
The KJ12D is a rod end joint from SMC’s KJ□D series, used as a piston rod attachment. It connects a cylinder’s piston rod to other mechanical mechanisms (such as rocker arms, clamps). Its core function is to automatically adjust the axial direction, allowing a ±19° tilt angle, thereby absorbing installation errors and axial deviations during movement. This product is widely used in automated equipment requiring flexible connections to avoid rigid interference, such as cylinder-driven swing mechanisms and linkage mechanisms.

Core Highlights: ±19° Self-Alignment, Flexible Connection, Wide Applicability

• ±19° Allowable Tilt Angle for Automatic Self-Alignment
  • The defining feature of the KJ□D series rod end joints is their excellent self-alignment capability, with an allowable tilt angle of up to 19°. This effectively compensates for eccentricity caused by machining/assembly errors or motion trajectories between the cylinder piston rod and the load, preventing lateral forces on the piston rod, thus protecting cylinder seals and extending equipment life.
• Flexible Connection to Absorb Deviations
  • Besides connecting cylinders, it can also be used in other applications requiring flexible transmission, such as an auxiliary connector for swing mechanisms. It enables smoother mechanism operation, reducing vibration and noise caused by rigid connections.
• Simplified Design and Assembly
  • Using a rod end joint can significantly shorten design and assembly time for swing mechanisms, eliminating the need for complex centering adjustment structures; the direct connection provides flexible compensation.
• Durable Steel Construction for Reliability
  • The main body material is steel, ensuring structural strength and long-term reliability when subjected to tensile and compressive forces.
• Standardized Interface for Clear Selection
  • Thread size: M12 × 1.25 female thread.
  • Applicable cylinders: Specifically suitable for C95, C96, CP96 series cylinders with a bore size of Φ40mm. Also widely applicable to other SMC cylinder series such as CJ2, CM2, CG1, CA2, MB, CQ2, etc.
  • Pin hole diameter: 12mm (Note: some sources listing pin hole size as 40mm may be incorrect; please refer to actual specifications).

Model Number Breakdown

Specifications Overview

Application Scenarios

• Connecting Cylinders to Rocker Arms: Acts as a flexible connection point between a cylinder and a swinging load, preventing piston rod binding.
• Mechanisms Requiring Eccentricity Compensation: When minor misalignment exists between the cylinder mounting and the load connection point.
• Linkage Mechanisms: Acts as a joint in pneumatic linkage systems for multi-degree-of-freedom movement.
• Floating Connections: Serves as a connector providing cushioning in applications where rigid impact needs to be avoided.

Summary: Self-Aligning Expert for Flexible Cylinder Connections
The KJ12D rod end joint perfectly addresses the core issue in automated equipment – cylinder piston rod damage caused by installation errors or motion deflection – through its ±19° large allowable tilt angle and automatic self-alignment function. Its steel construction ensures sufficient mechanical strength, while the standard M12×1.25 thread enables convenient, precise matching with numerous mainstream SMC cylinders (such as the Φ40mm bore C95/CP96 series). Choosing the KJ12D means equipping your cylinder with a reliable, durable flexible joint that effectively extends equipment life.