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Help Center304 SS Diaphragm Disc Flexible Coupling for Servo Motor and Encoder Positioning Systems
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Welcome to Hebei Speed Torque Transmission Technology Co., Ltd. Founded in 2017 and operating from a 3,000–5,000 m² factory, we bring years of precision engineering expertise to the global market. Our 304 SS Diaphragm Disc Flexible Coupling is specifically engineered for servo motor and encoder positioning systems that demand zero backlash, high torsional stiffness, and reliable misalignment compensation. Crafted from premium 304 stainless steel, this coupling offers outstanding corrosion resistance and durability, making it an ideal choice for precision automation, robotics, and CNC machinery. As a trusted manufacturer with ISO9001 certification and annual export value of US$5–10 million, we guarantee consistent quality and on-time delivery.
Key Product Features & Technical Benefits
Material Excellence: Fully machined from 304 stainless steel – offers excellent corrosion resistance, high strength at low temperatures, and non-magnetic properties (ideal for encoder applications).
Diaphragm Disc Design: Utilizes a thin, flexible stainless steel disc pack that transmits torque while compensating for axial, angular, and parallel misalignment without adding bearing loads.
Zero Backlash Performance: The all-metal construction ensures zero backlash, essential for high-precision servo positioning and encoder feedback systems.
High Torsional Stiffness: The diaphragm design provides high torsional rigidity, enabling accurate torque transmission and reducing phase shift in encoder signals.
Low Moment of Inertia: Lightweight and compact design minimizes inertia, allowing faster acceleration and deceleration in servo drive applications.
Maintenance-Free Operation: No moving parts, no lubrication required – reduces downtime and operational costs.
Customizable Bore Sizes: Available with keyway, set screw, or clamp-type hubs to fit various shaft diameters (typical range: 6 mm to 50 mm).
Electrical Isolation: The diaphragm disc naturally provides galvanic isolation between motor and load shafts, preventing electrical damage to sensitive encoder electronics.
Technical Specifications (Typical Parameters)
| Parameter | Value / Description |
| Material | 304 Stainless Steel (disc & hubs) |
| Bore Range | 6 mm – 50 mm (custom per request) |
| Rated Torque | 0.5 Nm – 100 Nm (model dependent) |
| Maximum Speed | Up to 10,000 rpm |
| Angular Misalignment | ±0.5° – ±1° |
| Axial Misalignment | ±0.2 mm – ±0.5 mm |
| Parallel Misalignment | ±0.1 mm – ±0.3 mm |
| Operating Temperature | -30°C to +120°C |
Why Choose Our 304 SS Diaphragm Coupling?
Precision Positioning – Ideal for encoder feedback systems where even micron-level error can affect performance. Our coupling minimizes hysteresis and maintains signal integrity.
Corrosion & Chemical Resistance – 304 SS provides superior resistance to moisture, mild acids, and industrial environments, ensuring long service life in harsh conditions.
Easy Installation – Available in clamp or set screw styles; full bore customization offered at no extra cost for standard ranges.
Balanced Operation – Each coupling is dynamically balanced for high-speed applications, reducing vibration and noise.
Trust & Reliability from Hebei Speed Torque
Hebei Speed Torque Transmission Technology Co., Ltd. has been delivering precision power transmission solutions since 2017. Our 3,000–5,000 m² factory houses over 150 skilled workers, supporting an annual export value of US$5–10 million. We serve diverse markets across North America, Europe, Asia, and Oceania. With ISO9001 certification, every coupling undergoes rigorous quality checks for bore concentricity, torque rating, and surface finish. We ship from major Chinese ports (Shanghai, Tianjin, Qingdao) with reliable lead times. Whether you need standard sizes or custom designs, our engineering team is ready to assist. Contact us today for a quote or technical consultation – let us help optimize your servo positioning system.
Frequently Asked Questions (FAQ)
Q1: Can this coupling be used with a high-speed servo motor (above 5,000 rpm)?
Yes, our 304 SS diaphragm disc coupling is designed for speeds up to 10,000 rpm depending on the model. The balanced design ensures stable operation at high speeds. Please confirm your speed requirement with our sales team for optimal selection.
Q2: Does the coupling provide electrical insulation between motor and load?
The stainless steel disc pack does not provide full electrical insulation (it is conductive). However, it offers galvanic isolation if the coupling hubs are of dissimilar materials. For complete electrical isolation, we recommend our polyurethane or nylon-disc variants (available upon request).
Q3: Can I order custom bore sizes and keyways?
Absolutely. We offer custom bore diameters within the 6–50 mm range, with options for keyway, set screw, or clamp hubs. Please provide your shaft dimensions, and we will tailor the coupling accordingly.
Q4: Is this coupling maintenance-free?
Yes. The all-metal diaphragm disc design has no wearing parts and requires no lubrication. Periodic visual inspection is sufficient; the coupling is designed for long-term, maintenance-free operation.
Q5: What is the typical lead time for standard models?
Standard sizes are usually in stock. For custom configurations, lead time is approximately 7–15 working days depending on quantity. We ship via DHL, FedEx, or sea freight from Shanghai/Tianjin/Qingdao ports.
Q6: Does the 304 stainless steel coupling affect magnetic encoder performance?
304 stainless steel is generally non-magnetic (annealed condition). For highly sensitive magnetic encoders, we can supply a special non-magnetic grade (e.g., 316L) or ensure the coupling is fully non-magnetic through heat treatment. Please specify your requirement.
Q7: How do I select the correct coupling size for my servo motor?
We recommend basing selection on the motor's maximum torque, shaft diameters, and allowable misalignment. Our technical datasheet provides a selection guide. Alternatively, contact our team with your motor specifications, and we will provide the ideal model.
Q8: Can this coupling compensate for large misalignments?
This diaphragm coupling is best for moderate misalignment (angular up to ±1°, parallel up to ±0.3 mm). If your application has larger misalignment, consider our bellows or Oldham couplings which offer higher lateral compliance.
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