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Dltb S45C Steel Double Step Double Diaphragm Keyway Disc Coupling – 8-Screw, High Rigidity, Zero Backlash
Model Number
Check below, custom
DSTB-26X26
DSTB-32X28
DSTB-34X32
DSTB-39X34.5
DSTB-44X34.5
DSTB-50X40.5
DSTB-56X45
DSTB-65X55.5
DSTB-87X67
DSTB-94X68
DSTB-104X70
DSTB-126X78
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
Dltb S45C Steel Double Step Double Diaphragm Keyway Disc Coupling – 8-Screw, High Rigidity, Zero Backlash
Factory direct | S45C steel body | Stainless steel diaphragm | 8-screw design | Double step | Double diaphragm | Keyway or clamping | 1–350 N·m | 0–10,000 RPM | Zero backlash | OEM/ODM/OBM
The Apexcoupling Dltb series is a high-performance double step double diaphragm disc coupling engineered for precision power transmission in demanding servo and stepper motor applications. Featuring a S45C steel body with stainless steel diaphragms, an 8-screw high-rigidity design, and zero backlash operation, this coupling delivers exceptional torsional stiffness, misalignment compensation, and long service life. Available with keyway or clamping shaft fixation, it is the ideal solution for manufacturing plants, machinery repair shops, food & beverage processing, printing, construction, energy & mining, and other industrial applications.
✅ Zero backlash – suitable for servo and stepper motors. High torsional rigidity – precision positioning. Maintenance-free – no lubrication required.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | Dltb (Double Step Double Diaphragm Disc Coupling) |
| Type | Flexible / Disc / Diaphragm |
| Structure | Double step, double diaphragm |
| Body Material | S45C carbon steel (heat-treated for durability) |
| Diaphragm Material | Stainless steel (high-strength, fatigue-resistant) |
| Surface Treatment | Blackening (black oxide) – corrosion resistant |
| Inner Hole Diameter | 3 – 55 mm |
| Outer Diameter | 19 – 126 mm |
| Allowable Torque Range | 1 – 350 N·m |
| Maximum Speed | 0 – 10,000 RPM |
| Backlash | Zero (no rotational clearance) |
| Fastening Method | Clamping screw (keyway available) |
| Screw Configuration | 8-screw high-rigidity design |
| Misalignment Compensation | Angular, radial, and axial |
| Lubrication | None required – maintenance-free |
| Standard or Nonstandard | Standard with OEM/ODM/OBM support |
| Customized support | OEM, ODM, OBM |
| Applicable Industries | Manufacturing plants, machinery repair shops, food & beverage factories, farms, printing shops, construction works, energy & mining |
| Warranty | 1 Year |
| Place of Origin | Guangdong, China |
🔧 Custom bores, keyways, and special materials available. Contact us with your specifications.
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| S45C Steel Body | High strength, excellent durability, and wear resistance – heat-treated for long service life |
| Stainless Steel Diaphragm | High fatigue resistance, corrosion resistance, and reliable torque transmission |
| Double Diaphragm Design | Provides higher torque transmission capacity and better displacement compensation – compensates angular, radial, and axial misalignment |
| Double Step Configuration | 20% faster assembly than traditional clamp couplings while ensuring precise clamping force |
| 8-Screw High-Rigidity Design | Greater torque capacity than 4 or 6-bolt designs – maximizes torsional stiffness |
| Zero Backlash | No rotational clearance – ideal for servo motors, stepper motors, and precision positioning |
| Keyway or Clamping Fixation | Choose your shaft connection method – keyway for high torque, clamping for easy installation |
| High Speed Capability | Up to 10,000 RPM – suitable for high-speed precision applications |
| Maintenance-Free | No lubrication required – reduces operating costs and eliminates maintenance schedules |
| Compact & Lightweight | Low moment of inertia – stable even at high RPM |
| OEM/ODM/OBM Support | Custom bores, keyways, materials, and branding available |
Product Structure
Two S45C Steel Hubs – Heat-treated for durability, precision-machined, black oxide finish.
Two Stainless Steel Diaphragms – Double diaphragm pack for higher torque capacity and misalignment compensation.
Center Spacer – Connects the two diaphragm packs.
8 High-Strength Screws – Secure fastening with high clamping force.
Keyway or Clamping Fixation – Choose your shaft connection method.
💡 The double diaphragm design uses two sets of stainless steel diaphragms connected by a center spacer, providing higher torque capacity and better misalignment compensation than single diaphragm designs.
Technical Data
| Parameter | Value |
|---|---|
| Body Material | S45C Steel |
| Diaphragm Material | Stainless Steel |
| Surface Treatment | Blackening |
| Inner Hole Diameter | 3 – 55 mm |
| Outer Diameter | 19 – 126 mm |
| Torque Range | 1 – 350 N·m |
| Max Speed | 10,000 RPM |
| Backlash | Zero |
| Screws | 8-Screw High-Rigidity |
| Lubrication | None |
Applications
Servo Motors – Precision positioning, zero backlash requirement
Stepper Motors – No lost steps, accurate motion control
CNC Machines – High-speed spindles, feed drives
Printing Machinery – Register control, high-speed operation
Packaging Machinery – Reliable, maintenance-friendly drives
Food & Beverage Processing – Stainless steel diaphragm for hygiene
Construction Machinery – Durable, high-torque connections
Energy & Mining – Conveyors, feeders, crushers
Textile Machinery – High-speed, precision drives
Centrifuges – High-speed, high-precision applications
FAQ
Q: What is a disc coupling?
A: A disc coupling (also called a diaphragm coupling) is a flexible coupling that uses one or more metal discs (diaphragms) to transmit torque while compensating for misalignment. It offers zero backlash, high torsional rigidity, and maintenance-free operation.
Q: What is the difference between single and double diaphragm?
A: A single diaphragm coupling uses one disc pack and compensates for angular and axial misalignment. A double diaphragm coupling uses two disc packs connected by a center spacer, providing higher torque capacity and better compensation for angular, radial, and axial misalignment.
Q: What does “double step” mean?
A: “Double step” refers to a two-stage clamping design that achieves 20% faster assembly than traditional clamp couplings while ensuring precise clamping force.
Q: Why 8 screws?
A: The 8-screw design provides greater torque capacity than 4 or 6-bolt designs, maximizing torsional stiffness and reliability.
Q: What materials are used?
A: The body is made of S45C carbon steel (heat-treated for durability) and the diaphragms are made of stainless steel for high fatigue resistance.
Q: What is the torque and speed range?
A: Torque range is 1–350 N·m and maximum speed is 10,000 RPM.
Q: Does the coupling have backlash?
A: No. The Dltb series features zero backlash – no rotational clearance, suitable for servo and stepper motors.
Q: What shaft fixation methods are available?
A: We offer keyway (for high torque applications) and clamping screw (for easy installation).
Q: Does the coupling require lubrication?
A: No. The Dltb series is maintenance-free – no lubrication required.
Q: Can I get a custom coupling?
A: Yes. We offer OEM, ODM, and OBM support – custom bores, keyways, materials, and branding available.
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