Electric cylinders—also known as power cylinders—are motor-driven actuators used for precise linear motion. Unlike hydraulic or pneumatic systems, electric cylinders are clean, efficient, and compact, eliminating the need for pumps, compressors, or fluid management. Commonly built with ball screws, gears, and motors with brakes, electric cylinders enable high-precision control and repeatable positioning even under heavy loads. However, bearing connections subjected to repetitive forward and reverse motion often suffer from fastener loosening—especially under dynamic loading.

• Bearing Loosening: Load-bearing joints can loosen over time due to constant direction reversal.
• Torque Instability: Maintaining proper torque and axial force is difficult without advanced fastening.
• Additional Components Required: Traditional methods often rely on chrysanthemum washers or keyway machining, increasing complexity and cost.

HARDLOCK Bearing Nut (HLB) was introduced at the bearing connection points of electric cylinders to prevent loosening caused by repeated load reversals and high-cycle vibration.

Key Benefits of HLB in Electric Cylinder Systems:

• Superior Loosening Prevention: The HLB’s unique wedge-locking mechanism delivers stable fastening, even during constant forward and reverse motion.
• Washer-Free Design: Eliminates the need for chrysanthemum washers or locking plates, streamlining assembly.
• Easy Installation & Torque Control: Enables precise torque management without the need for keyway machining, reducing setup time.

• Axial Stability Maintained: No loosening, even under high-speed, high-load applications.
• Enhanced Work Efficiency: Simplified assembly and fewer maintenance requirements lead to reduced man-hours.
• Cost-Effective: Fewer components and no need for keyway processing lower production costs.
• Long-Term Reliability: Increases the durability and service life of electric cylinder assemblies.

HARDLOCK Bearing Nut (HLB) delivers precision fastening for electric cylinder applications—supporting automation, robotics, and heavy-duty motion control with unmatched reliability and zero-maintenance performance.

Tsubaki: Electric Power Cylinders

Industrial machinery operates under intense conditions—including high torque, vibration, heat, and shock—which can easily cause traditional fasteners to loosen or fail. HARDLOCK’s full line of fastening solutions provides unmatched stability and safety in these environments. Our technology is trusted across a wide range of equipment and applications, with tailored solutions for every fastening need:

• HARDLOCK Nut (HLN) for general anti-loosening performance in structural joints
• HARDLOCK Bearing Nut (HLB) for precise shaft locking under dynamic loads
• HARDLOCK Set Screw (HLS) for compact, reliable fixing where standard fasteners fail

Together, these products reduce maintenance cycles, extend equipment life, and ensure continuous, safe operation.

Key Machinery Applications for HARDLOCK Nut (HLN), HARDLOCK Bearing Nut (HLB), HARDLOCK Set Screw (HLS):

• Cement Mill (Liner Stopper)
• Pump Systems (Impeller Stopper)
• Concrete Mixers (Decelerator Shaft Locking)
• Tapping Machines (Ball Screw Locking)
• Power Cylinders (Drive Shaft Stopper)
• Injection Molding Machines
• Excavators (Drill Drive Shaft Stopper)
• Steelmaking Equipment
• Rock Drilling Machines (Straightening Roll Stopper)
• Hydraulic Breakers (Stopper Components)
• Conveyor Rollers
• Agitators (Impeller Stopper)
• Industrial Robots (Arm Assembly Locking)
• Large Hydraulic Presses (Cylinder Units)
• Die-Casting Machines (Core Pin Stopper)
• Compressors (Axis Stopper)

From factory floors to heavy-duty field equipment, HARDLOCK fastening systems—HLN, HLB, and HLS—offer a complete and proven solution for vibration-resistant, maintenance-free performance.