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                                                                                                                                                                                                                                    THK precision ball screw BNK series, BNT series ball screw for linear actuators, robot actuator ball screw with warranty
                      

Accuracy Grade:	C3 / C5 / C7 (Ground Or Rolled)	Nut Type:	Single Nut / Double Nut (Preloaded)
Shaft Diameter:	4mm - 100mm (Wide Range Support)	Axial Play:	Zero Backlash (via Preload)
End Machining:	Custom Machining Per Drawing	Brand Origin:	Japan (100% Genuine)
Shipping Term:	International Express（DHL/FEDEX/TNT/UPS/ARAMEX）/sea Freight / Air Freight / International Special Line	Freight Charge:	For Industrial Equipment (e.g., PLC Modules, Inverters..), Shipping Cost Varies By Package Weight/volume And Delivery Location. Contact Our Sales Team For A Customized Shipping Solution And Quote

Accuracy Grade:	C3 / C5 / C7 (Ground Or Rolled)
Nut Type:	Single Nut / Double Nut (Preloaded)
Shaft Diameter:	4mm - 100mm (Wide Range Support)
Axial Play:	Zero Backlash (via Preload)
End Machining:	Custom Machining Per Drawing
Brand Origin:	Japan (100% Genuine)
Shipping Term:	International Express（DHL/FEDEX/TNT/UPS/ARAMEX）/sea Freight / Air Freight / International Special Line
Freight Charge:	For Industrial Equipment (e.g., PLC Modules, Inverters..), Shipping Cost Varies By Package Weight/volume And Delivery Location. Contact Our Sales Team For A Customized Shipping Solution And Quote

Original THK Precision Ball Screw BNK/BNT Series for Robot Linear Actuators

As the global pioneer of Linear Motion (LM) systems, THK's precision ball screws are the premier choice for achieving high-efficiency, high-frequency linear reciprocating motion. By integrating precision steel balls between the screw and the nut, THK converts sliding friction into rolling friction, reducing resistance to just 1/50th of conventional screws. Known for their superior positioning accuracy, extreme service life, and micrometer-level smoothness, THK ball screws are indispensable components for humanoid robot linear actuators, precision CNC machinery, and semiconductor manufacturing equipment.

Product Highlights

Extreme Transmission Efficiency: Minimal friction loss results in mechanical efficiency exceeding 90%, significantly lowering the power requirements for drive motors.
Micrometer Positioning Accuracy: Manufactured using ultra-precision grinding processes in Japan, ensuring high axial positioning accuracy even during high-speed operation.
Superior Rigidity & Preload Technology: Unique preload adjustments eliminate axial play, providing exceptional transmission rigidity and vibration-free performance.
Exceptional Service Life: Crafted from high-quality alloy steel with specialized induction hardening to ensure minimal wear under long-term, high-load operations.
Low Noise & Smoothness: Optimized ball circulation circuit design ensures quiet and smooth movement, even with large-lead screws at high speeds.
Micro-Design Advantage: Offers miniature series with diameters as small as 4mm, ideal for dexterous humanoid hands and micro-actuators.

Core Parameter Table (Precision Ground Series)

Model (Series)	Shaft Dia (mm)	Lead (mm)	Accuracy Grade	Dynamic Load (kN)	Max Length (mm)
BNK-0802	8	2	C3 / C5	2.1	300
BNK-1205	12	5	C3 / C5	4.6	600
SDM-1510	15	10	C5 / C7	6.8	1000
BIF-2005	20	5	C3 / C5	11.2	1500
BLK-2525	25	25	C5 / C7	14.5	2000

Application Fields

Humanoid Robots: Linear actuators for legs (push-rods), waist support mechanisms, and arm extension devices.
Semiconductor Equipment: Wafer dicing machines, precision dispensers, and AOI inspection stages.
Precision CNC Machines: Small machining centers, CNC grinders, and precision engravers.
Medical Automation: Automated analyzers, surgical bed adjustments, and laboratory liquid handling.
Factory Automation (FA): High-speed Pick & Place robots and integrated electric cylinders.

Frequently Asked Questions

Q: How do you guarantee that THK screws are 100% original Japan-made?

A: We guarantee all THK products are sourced directly from THK Japan or their official global authorized distributors. Each unit includes original markings and anti-counterfeit packaging.

Q: What is the difference between Ground and Rolled screws?

A: Ground screws offer higher precision (C0-C5) for high-accuracy positioning, while Rolled screws (C7-C10) are cost-effective for general transport. C5 or higher ground screws are recommended for robot joints.

Q: Do you offer end machining for the screws?

A: Yes, we provide customized end-machining services based on your drawings, including support-bearing seats, keyways, and threads for immediate installation.

Q: How do I determine the best lead size for my application?

A: Lead determines the relationship between motor speed and linear velocity. Large leads (e.g., 10mm or 20mm) are for high speed; small leads (e.g., 2mm) provide higher thrust and resolution.

Q: Are the screws lubricated upon delivery?

A: THK screws are typically shipped with anti-rust oil. Before use, apply the appropriate amount of THK original grease (e.g., AFA, AFB-LF) according to the manual.

Q: What is the difference between Planetary Screws and Ball Screws?

A: Planetary screws handle extremely high loads for heavy tonnage but are very costly. Ball screws are the optimal balance of cost and precision for typical robotic thrust requirements.

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Original THK Precision Ball Screw BNK/BNT Series for Robot Linear Actuators

THK precision ball screw BNK series

BNT series ball screw for linear actuators

robot actuator ball screw with warranty

THK precision ball screw BNK series,

BNT series ball screw for linear actuators,