Is Your Machine Losing Precision? Stop Vibration and Lost Motion Today
You work hard to build great machines. But sometimes, small problems cause big headaches. Does your slide table shake when it stops? Does your lead screw miss the exact position? This is called resonance. It happens when the motor and the shaft do not match perfectly. Loose connections cause “backlash.” That is the dead space where the motor turns, but the load does not move. It ruins your product quality. It wastes expensive materials. It slows down your production line. You need a connection that is tight, strong, and perfect every time. You need a coupling that fixes misalignment without adding weight.
Meet the Miki Pulley SFC-030DA2: The Gold Standard for Servo Motors
This is not a standard rubber coupling. This is the Miki Pulley Servoflex SFC-030DA2. It is a Japanese-made masterpiece for high-speed automation. Miki Pulley builds these with a special aluminum alloy. It is light but very strong. The design uses a diaphragm (plate spring) structure. This means there is zero backlash. The motor responds instantly. There is no delay.This specific model, SFC-030DA2, is a double-element type. It has two flexible elements separated by a spacer. This makes it more flexible than single types. It handles more misalignment. If your shaft is slightly off-center, this coupling fixes it. It protects your motor bearings. It stops vibration from traveling to your lead screw. Your slide table moves smooth. Your positioning is exact.
Technical Specs: What Makes SFC-030DA2 Special?
We know you need exact numbers for your engineering team. Here is the data for the SFC-030DA2 model with an 11mm to 11mm bore (Type A):
- Model Name: SFC-030DA2 (Type A)
- Bore Diameter (d1 x d2): 11mm x 11mm (We also stock 5-10mm, over 10mm options)
- Rated Torque: 5 N·m (Newton meters). This is the safe working limit.
- Max Torque: 10 N·m (The peak it can handle before breaking).
- Misalignment Tolerance:
- Parallel (Offset): 0.18 mm max.
- Angular (Skew): 1 degree max (on one side).
- Axial (End float): ±0.4 mm. Your shaft can move back and forth slightly without damage.
- Moment of Inertia: 11.56 × 10⁻⁶ kg·m². This is very low. It means fast acceleration.
- Max Speed: 10,000 RPM (rotations per minute).
- Material: Hub is Aluminum Alloy. Element is Stainless Steel (SUS304).
- Weight: Only 0.068 kg. Very light for high-speed moves.
- Tightening Torque: For M3 screws, tighten to 1.5 – 1.9 N·m.
Why Choose the Double Element (Type A) for Your Slide Table?
You might see Type B and Type C. But Type A (Double Element) is the best for general automation. Why? Because it has a spacer in the middle. This gives it “high flexibility” and “high torque” at the same time.Imagine your slide table moving fast. It stops suddenly. The inertia hits the coupling. A rigid coupling would break or bend the shaft. The SFC-030DA2 absorbs that shock. The diaphragm flexes. It acts like a shock absorber. But it is stiff in torsion (twisting). So, when the motor turns, the table turns immediately. No energy is lost.This is critical for ball screw drives. Ball screws are precise but fragile. If you hammer them with vibration, they wear out fast. The SFC-030DA2 isolates the motor vibration. It makes your ball screw last longer. It keeps your machine accurate for years.
Perfect Applications: Where to Use This Coupling
This part is everywhere in high-tech factories. Here is where you will use it:
- Servo Motor to Ball Screw: The #1 use case. Connects the motor shaft directly to the ball screw.
- CNC Slide Tables: For X, Y, and Z axis movement. Keeps the table flat and level.
- Semiconductor Machines: Where micron-level precision is needed. Zero backlash is a must here.
- Packaging Machines: High-speed start-stop cycles. The low inertia saves electricity and time.
- Linear Actuators: Where space is tight and weight must be low.
If you have a project with a shaft size of 11mm, this is the perfect fit. It is a “friction lock” type. You tighten the clamp, and it grips the shaft tight. No keyway needed (though keyways are available for specific sizes). It is maintenance-free. You install it once and forget it.
Installation and Maintenance: Simple and Clean
You do not need a specialist to install this. It uses a hex socket head cap screw (M3 size). You just need an Allen key.
- Clean the shaft and the bore. Make sure there is no dust.
- Slide the coupling onto the shaft.
- Tighten the clamp screws evenly. Do not over-tighten. Follow the 1.5-1.9 N.m rule.
- Check that the shafts are aligned as best as possible.
Because it uses stainless steel springs and aluminum, it does not rust easily. It handles dust and light oil well. It is much better than old-style jaw couplings that use rubber spiders which wear out and get sticky.
Get Your Quote for SFC-030DA2-11B-14B or Custom Sizes Today
Do not let a bad coupling ruin your machine’s reputation. You need Japanese quality. You need the Miki Pulley SFC-030DA2. It is the industry standard for a reason. It is reliable, precise, and built to last.We have stock of the SFC-030DA2 series. We can supply bore sizes from 5mm up to 30mm. Whether you need 11-11mm, 12-14mm, or custom sizes, we can help. We ship worldwide. Our prices are competitive for bulk orders.Act now. Send us your inquiry. Tell us your shaft size and your torque needs. We will send you a formal quote within 24 hours. Upgrade your machine with the best coupling on the market. Your production line will thank you.Contact us today for the best price on Miki Pulley SFC-030DA2!