DJ-F Flange Star Elastic Coupling – Zero Backlash, High Torque for Heavy Machinery

Factory Direct | 45# Steel Hubs | Polyurethane Star Elastomer | Zero Backlash | 70-23500 N·m Torque | 14000-1800 RPM | Flange Connection | Double Flange Radial Installation | Maintenance-Free | OEM Customizable

The Apexcoupling DJ-F series is a high-performance flange star elastic coupling designed for heavy-duty industrial applications requiring zero-backlash torque transmission and robust flange connections. Available in five structural types (A, B, C, D, and E) to suit diverse mounting requirements, this coupling features a star-shaped polyurethane elastomer that provides excellent vibration damping, shock absorption, and misalignment compensation. The flange design enables secure connection to heavy machinery, while the double flange structure (Types B and D) allows for radial installation without moving connected equipment – significantly simplifying maintenance and elastomer replacement. With maintenance-free operation, compact radial dimensions, and high load capacity, the DJ-F series is the ideal solution for main spindle drives, lifting platforms, machine tools, compressors, fans, pumps, and heavy industrial machinery.

✅ Zero backlash for precise positioning. Flange design for heavy machinery connection. Double flange structure for radial installation without moving equipment. Maintenance-free – no lubrication required. High load capacity – up to 23500 N·m. Compact radial dimensions.

Key Technical Specifications

🔧 Custom bores, keyways, and special flanges available. Contact us with your specifications.

DJ-F Series – Model Range & Specifications

📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.

Structural Types – Choose the Right Configuration

The DJ-F series is available in five structural types to suit different mounting requirements:

✅ Types B and D feature a double flange structure that allows for radial installation without moving the equipment at either end – enabling quick replacement of the elastomer body.

Product Structure

1. Two Flanged Hubs – Precision-machined from 45# steel with flange connection.

2. Star-Shaped Polyurethane Elastomer – Provides zero-backlash torque transmission, vibration damping, and misalignment compensation.

3. Flange Bolts – Secure the flange connection to heavy machinery.

4. Double Flange Option (Types B and D) – Allows radial installation without moving connected equipment.

💡 How it works: The DJ-F coupling consists of two flanged hubs with a star-shaped polyurethane elastomer between them. Power is transmitted through the elastomer, which flexes to absorb shock, dampen vibration, and compensate for misalignment. The flange design provides a secure connection to heavy machinery, while the double flange structure (Types B and D) enables radial installation for quick elastomer replacement without moving connected equipment. The zero backlash design ensures precise positioning, while the maintenance-free polyurethane elastomer requires no lubrication.

Product Features & Advantages

Applications

• Heavy Machinery – Flange-connected industrial equipment

• Main Spindle Drives – CNC machine tools, machining centers

• Lifting Platforms – Scissor lifts, aerial work platforms

• Machine Tools – Lathes, milling machines, grinding machines

• Compressors – Air and gas compressors

• Fans & Blowers – Industrial ventilation systems

• Pumps – Centrifugal, gear, and diaphragm pumps

• General Industrial Machinery – Mixers, conveyors, agitators

Why Choose Apex Coupling for DJ-F Flange Star Couplings?

FAQ

Q: What is the advantage of the double flange structure (Types B and D)?
A: The double flange structure allows for radial installation without moving the equipment at either end – enabling quick replacement of the elastomer body without disassembling the connected machinery.

Q: What are the different structural types?
A: Type A – flange + shaft. Type B – double flange, radial installation. Type C – flange + shaft, compact OD. Type D – double flange, custom. Type E – flange + shaft.

Q: Does the coupling have backlash?
A: No. The DJ-F series features zero backlash – no rotational clearance, ensuring precise positioning.

Q: What materials are used?
A: The hubs are made of 45# steel. The elastomer is made of high-strength polyurethane (PU) with 98 Shore A hardness.

Q: Is the coupling maintenance-free?
A: Yes. The DJ-F series is maintenance-free – no lubrication required.

Q: What is the operating temperature range?
A: The operating temperature range is -35°C to +80°C.

Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom bores, keyways, and special flanges (Type D) available.

Request a Quote

Send us your type (A, B, C, D, or E), model (e.g., DJ55F), bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.