DFC Aluminum Jaw Coupling | Zero Backlash, High Torque, OEM Custom

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DFC Aluminum Curved Jaw Coupling – Zero Backlash for Servo Motors & Ball Screws

Model Number
Check below, custom

Outer Diameter (mm)	Length (mm)	Bore Diameter Range (mm)
14	22	3–8
20	25	3–10
20	30	3–10
25	30	4–14
25	35	4–14
30	35	5–16
30	42	5–16
35	50	5–19
40	50	6–22
40	66	6–22
45	55	8–25
45	66	8–25
55	66	12–30
55	78	12–30
65	90	14–38
80	114	14–45

Note: Non‑standard customization is also available (as indicated in the original text). All dimensions are in millimeters (mm).

Product Description

DFC Aluminum Curved Jaw Coupling – Zero Backlash, High Torque for Servo & Stepper Motors

The Apexcoupling DFC series is a high-performance aluminum curved jaw coupling (spider/plum coupling) engineered for precision motion control. Featuring zero rotational clearance, it is ideal for servo motors, stepper motors, and ball screw drives. Constructed from high-strength aluminum alloy with a wear-resistant polyurethane spider, it absorbs vibration, compensates for misalignment, and ensures reliable, maintenance-free operation.

✅ Zero backlash for precise positioning. Lightweight aluminum reduces inertia. Ideal for demanding automation and CNC applications.

Key Technical Specifications

Parameter	Value
Brand	Apexcoupling
Model Series	DFC (Curved Jaw / Spider / Plum Coupling)
Body Material	High-strength aluminum alloy (aviation-grade 6061 available)
Spider Material	German imported polyurethane – wear-resistant, oil-resistant
Surface Finish	Anodized (corrosion-resistant)
Backlash	Zero (zero rotational clearance)
Bore Tolerance	H7 / H6 (precision fit)
Fastening Method	Clamping screw (12.9 grade)
Misalignment Compensation	Angular, radial, and axial
Operating Temperature	-30°C to 100°C (polyurethane spider)
Customization	OEM, ODM, OBM

Product Features & Advantages

Advantage	Benefit
Zero Backlash Design	No lost motion – ensures precise positioning for servo and stepper motors.
High-Strength Aluminum Alloy	Lightweight, low inertia, and high torsional rigidity – ideal for high-speed applications.
German Polyurethane Spider	Excellent wear resistance, oil resistance, and vibration damping – extends service life.
H7/H6 Precision Bore	High concentricity and accurate shaft fit – reduces vibration.
Anodized Surface	Enhanced corrosion resistance and a professional appearance.
Clamping Screw Design	Secure, even clamping force without damaging the shaft.
Maintenance-Free	No lubrication required – reduces operating costs.
OEM Customization	Custom bores, keyways, and spider hardness available.

Why Choose a Curved Jaw Coupling for Servo Applications?

The DFC series is specifically designed for high-precision servo and stepper motor applications. The unique curved jaw design, combined with the pre-loaded polyurethane spider, provides a zero-backlash connection. This ensures accurate positioning and eliminates the “lost motion” that plagues traditional straight-jaw couplings, making it the preferred choice for demanding CNC machines, robotics, and automation equipment.

Applications

Servo Motors
Stepper Motors
Ball Screw Drives
CNC Machines
Robotics
3D Printers
Packaging Machinery
Automation Equipment

Request a Quote

Send us your required bore size, torque, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.