Original THK Precision Ball Screw BNK/BNT Series for Robot Linear Actuators
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Highlight
THK precision ball screw BNK series
,BNT series ball screw for linear actuators
,robot actuator ball screw with warranty
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Accuracy GradeC3 / C5 / C7 (Ground Or Rolled)
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Nut TypeSingle Nut / Double Nut (Preloaded)
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Shaft Diameter4mm - 100mm (Wide Range Support)
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Axial PlayZero Backlash (via Preload)
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End MachiningCustom Machining Per Drawing
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Brand OriginJapan (100% Genuine)
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Shipping TermInternational Express（DHL/FEDEX/TNT/UPS/ARAMEX）/sea Freight / Air Freight / International Special Line
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Freight ChargeFor 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
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Place of OriginJapan
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CertificationISO、RoHS、Japan Machine Tool Builders' Association
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Minimum Order Quantity1
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Price$150.00 - $1200.00
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Packaging DetailsOriginal
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Delivery Time3-5Workdays
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Payment TermsL/C,D/A,D/P,T/T,Western Union
Original THK Precision Ball Screw BNK/BNT Series for Robot Linear Actuators
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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