Is Your Machine Losing Precision? Stop The Headaches Now
You have a big problem with your CNC machine or automated linear actuator. The motor spins, but the lead screw does not move exactly as it should. You see small errors in positioning. The machine jams sometimes. You hear weird noises when the speed changes. This is not just annoying. It costs you money. It wastes raw materials. It makes your customers unhappy.The root cause is often a cheap coupling. It has “backlash.” This means there is a tiny gap between parts. When you reverse direction, the motor turns a little bit before the screw moves. This kills accuracy. Also, if your motor shaft and lead screw are not perfectly aligned, a stiff coupling will break the bearings. It creates vibration. It wears out your expensive servo motor.You need a solution that fixes misalignment. You need zero backlash. You need the Miki SFC-035DA 10-12 diaphragm flexible coupling. This is not a generic part. It is a high-end Japanese product made by Miki Pulley. It is built for one job: connecting your servo motor to the lead screw with perfect precision. It handles high speed. It handles quick starts and stops. It makes your machine run smooth and accurate for years.
What Is The Miki SFC-035DA 10-12 Coupling?
This is a metal disc coupling. People also call it a diaphragm coupling. It uses a special aluminum alloy hub. It has a double-element structure. This means it has two sets of flexible metal discs (diaphragms). These discs connect the motor side to the screw side.Because it uses metal discs, there is no sliding friction. There are no teeth to wear down. It transmits torque directly. This gives it very high torsional rigidity. When the motor turns, the screw turns instantly. No delay. No lost motion.The “SFC” stands for Servo Flex Coupling. The “035” is the size series. The “DA” means it is a double element type. The “10-12” refers to the bore sizes. One side fits a 10mm motor shaft. The other side fits a 12mm lead screw shaft. It uses a clamp-style hub. You do not need a keyway. You just tighten the screws, and it grips the shaft tight. This creates a zero-backlash connection.
Technical Specifications You Can Trust
We know you need exact numbers for your engineering team. Here is the data for the SFC-035DA2 model in Type C configuration (which is common for this size).
Key Dimensions and Ratings
- Model: SFC-035DA2 (Type C)
- Bore Diameters: 10mm to 12mm (Clamp Style)
- Max Shaft Diameter: d1=16mm, d2=19mm (but for 10-12, it is restricted to 10/12)
- Rated Torque: 10 N·m (This is the safe working load)
- Maximum Allowable Torque: 250 N·m (This is the breakage point, do not go here)
- Max Rotation Speed: 10,000 min⁻¹ (RPM). This is very fast for a small coupling.
- Torsional Stiffness: 9,000 N·m/rad. This is very stiff. It resists twisting under load.
- Axial Stiffness: 56 N/mm. It resists being pulled apart.
- Misalignment Limits:
- Angular: 1 degree (on one side). It handles slight bends in the shaft.
- Axial: ±0.5 mm. It handles slight in-and-out movement.
- Parallel: 0.24 mm. It handles side-to-side offset.
- Moment of Inertia: 26.93 × 10⁻⁶ kg·m². This is very low. It is great for fast acceleration.
- Mass: 0.121 kg. It is very light. It does not add weight to your moving parts.
- Material: Aluminum Alloy for hubs, Stainless Steel for discs.
- Temperature Range: Standard grease works from -20°C to 80°C.
Why This Coupling Beats The Competition
You might find cheaper couplings on Alibaba or eBay. But they are not the same. Here is why the Miki SFC-035DA is better.
Zero Backlash Is Guaranteed
Cheap couplings use a “jaw” design with a spider insert. The insert wears out. Gaps appear. The Miki uses a clamp hub and metal discs. There is nothing to wear out. The fit is tight. Your machine stays accurate for 5 years or more.
It Handles High Speed Safely
Many couplings vibrate at 3000 RPM. The SFC-035DA is balanced for 10,000 RPM. If you are building a high-speed pick-and-place machine, this is the part you need. It does not wobble. It does not heat up.
It Forgives Installation Errors
Perfect alignment is hard. Machinists make small mistakes. If you use a rigid coupling, a 0.1mm error can destroy a bearing. The SFC-035DA absorbs that error. The flexible discs bend slightly. They take the stress. They protect your motor and your screw.
Compact and Lightweight
Space is tight inside machines. The outer diameter is only 39mm. The length is 48mm. It fits in small spaces. Because it weighs only 121 grams, it reduces the inertia of the system. Your servo motor can accelerate faster. You get shorter cycle times.
Cleanroom Ready
This coupling is made with low-dust grease. It is cleaned and packed carefully. If you work in medical devices, semiconductors, or food packaging, you need a clean coupling. The SFC-035DA meets ISO Class 6 standards. It does not contaminate your product.
Perfect Applications For This Coupling
Where should you use the SFC-035DA 10-12? It is perfect for medium-duty precision applications.
CNC and 3D Printers
If you are building a desktop CNC or a high-end 3D printer, this is the go-to part. It connects the stepper or servo motor to the ball screw. It ensures the nozzle or cutter is exactly where the computer says it is. No ghosting. No layer shifting.
Medical Equipment
In medical robots or lab automation, reliability is life-or-death. You cannot have a coupling slip. The metal disc design is fail-safe. It is used in infusion pumps and scanner beds.
Packaging Machines
Packaging lines run fast. They start and stop thousands of times a day. The SFC-035DA handles the shock loads. It keeps the timing belt or lead screw in sync.
Semiconductor Manufacturing
Wafer handling robots need sub-micron accuracy. The zero backlash feature is critical here. The aluminum alloy does not generate magnetic interference, which is good for sensitive electronics.
Factory Automation
For linear actuators in assembly lines, this coupling is a workhorse. It is maintenance-free. You install it and forget about it. It resists oil and grease.
Installation and Maintenance Tips
Installing this part is easy if you follow the rules. You do not need special tools, but you need a torque wrench.
- Clean the Shafts: Make sure the 10mm and 12mm shafts are clean. No oil, no dirt, no burrs.
- Insert the Shaft: Slide the hub onto the shaft. Make sure the shaft bottoms out in the hub hole.
- Tighten the Clamp Screws: There are M4 or M5 screws (depending on the exact sub-model). Tighten them in a cross pattern. Do not tighten one screw all the way, then the next. Go 30%, 60%, 100%.
- Use a Torque Wrench: This is critical. The tightening torque is usually between 3.4 to 4.1 N·m for M4 screws. If you over-tighten, you will crack the hub. If you under-tighten, it will slip.
- Check Alignment: After installing, run the motor slowly. Check for vibration. If it vibrates, your alignment might be worse than 1 degree. Adjust the mounts.
- No Lubrication Needed: The discs are sealed. Do not try to grease it. It is a maintenance-free design.
Why Buy From Us?
We are a specialized foreign trade company. We understand cable and machinery parts. We do not just sell a part number. We sell a solution to your problem.
- Genuine Japanese Import: We source directly from Miki Pulley factories or authorized agents. No fakes. No “Chinese copies.” You get the real specs.
- Fast Shipping: We know your production line is waiting. We use DHL, FedEx, or air freight. We can get this to you in 3-5 days.
- Technical Support: If you are not sure if 10-12 is the right bore size, ask us. We can check the catalog for you. We can confirm the max torque for your specific speed.
- Bulk Pricing: If you are a manufacturer buying 50 or 100 pieces, we give you deep discounts. We beat the price of MISUMI or local distributors.
- After-Sales Service: If the part is defective (which is rare for Miki), we replace it. We stand by our quality.
Get Your Quote Today
Do not let a bad coupling ruin your product quality. Stop the vibration. Stop the positioning errors. Upgrade to the Miki SFC-035DA 10-12 diaphragm coupling. It is the industry standard for a reason.We have stock ready to ship. Or we can order fresh from Japan for you.Send us an inquiry now. Tell us your quantity. Tell us your destination. We will send you a formal quotation within 24 hours. Let’s get your machines running at 100% precision.Click “Contact Supplier” or email us now. Don’t wait until your machine breaks down.