DFG Series High Precision Stainless Steel Jaw Couplings

Zero-Backlash Flexible Plum Blossom Couplings for Servo & Stepper Motor Drives

Apex Coupling’s DFG Series Stainless Steel Jaw Couplings (also known as plum blossom flexible couplings) feature premium SUS304 stainless steel shaft sleeves combined with a wear-resistant polyurethane (PU) spider insert. Engineered for high-precision drive systems, the DFG series offers zero rotation clearance (zero backlash), making it ideal for continuous forward and reverse motor positioning in harsh, corrosive, or oil-exposed environments.

• Sleeve Material: Premium SUS304 Stainless Steel

• Elastomer Insert: High-Grade Polyurethane (PU) Spider

• Surface Finish: Anodized / Polished Stainless Steel Finish

• Fastening Method: Set Screw Type / Clamping Screw Options (Detachable Design)

• Backlash: Zero Backlash (0 Rotational Clearance)

• Working Temperature Range: -35°C to +80°C

• Drive Compatibility: Servo Motors, Stepper Motors, Encoder Drives

• MOQ: 1 PCS (Large semi-finished stock available for fast B2B delivery)

2. Key Features & Technical Advantages

Why Choose DFG Stainless Steel Jaw Couplings?

1. Zero Backlash & Bi-Directional Precision: Engineered with exact jaw tolerances to eliminate rotational play, ensuring smooth torque transfer during rapid forward and reverse servo positioning cycles.

2. Superior Polyurethane Elastomer Spider: The high-density PU central insert provides excellent wear resistance, oil resistance, chemical resistance, and electrical insulation.

3. Multi-Directional Misalignment Compensation: Efficiently absorbs rotational shock and vibration while compensating for radial, angular, and axial shaft deviations.

4. Heavy-Duty SUS304 Stainless Steel Hubs: High-strength SUS304 hubs offer exceptional corrosion resistance, making them suitable for packaging, chemical, pharmaceutical, and cleanroom automation equipment.

5. Detachable Design & Easy Installation: Features a split 3-piece detachable assembly with set screws or clamping fasteners for quick alignment and stress-free shaft mounting.

3. Technical Specifications & Material Characteristics

Technical Parameters & Material Specifications

Bore Customization Options

We provide quick-turn bore machining for OEM machinery manufacturers:

• Standard Round Bore with H7 Tolerance

• Keyway Machining (K)

• Hexagonal Bore (F) or Square Bore (S)

• Custom Set Screw Pitch and Positioning

4. Target Industrial Applications

Where Are DFG Stainless Steel Jaw Couplings Used?

Thanks to their corrosion resistance, electrical insulation, and dynamic balancing, DFG couplings are widely applied across:

• Precision Servo & Stepper Motor Drive Systems

• CNC Machine Tools & Automated Motion Controllers

• Food Processing & Pharmaceutical Packaging Machinery

• Semiconductor & Photovoltaic Manufacturing Lines

• Chemical Processing Equipment & Outdoor Industrial Drives

5. B2B Inquiry Form 

Get a Wholesale Quote & Free Selection Catalog

Need custom inner bore sizes, bulk pricing, or digital PDF catalogs for DFG stainless steel jaw couplings? Send your machine specifications to our technical engineers.

• Contact Name & Company Name:

• Business Email (Corporate Email Preferred):

• Target Model / Shaft Diameter (d1 / d2):

• Motor Type & Power Rating (e.g. 400W Servo Motor / NEMA 23 Stepper):

• Estimated Order Volume (PCS):

• Upload CAD Drawing / Technical Requirements: