DH Aluminum Oldham Coupling | Zero Backlash, Cross Slider, Clamp/Set Screw

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DH Aluminum Cross Slider Coupling – Oldham Type, Zero Backlash for Servo/Stepper Motors

Model Number
Check below, custom

DHC-16×30

DHC-20×33

DHC-25×39

DHC-32×45

DHC-40×50

DHC-50×53

DHC-50×58

DHC-63×71

Product Description

DH Aluminum Cross Slider Coupling – Oldham Type, Zero Backlash for Servo & Stepper Motors

The Apexcoupling DH series is a high-precision aluminum cross slider coupling (Oldham type) engineered for precision motion control applications. Featuring a lightweight aluminum alloy body and an imported PA66 (polyacetal) center slider, this coupling delivers zero backlash torque transmission with excellent wear resistance, corrosion resistance, and electrical insulation. The sliding design effectively compensates for radial and angular misalignment, while the detachable construction allows for easy installation and maintenance. With set screw fastening, H7 precision bore, and maintenance-free operation, the DH series is the ideal solution for servo motors, stepper motors, encoders, resolvers, 3D printers, CNC machines, and miniature drive systems.

✅ Zero backlash – no lost motion for precise positioning. Imported PA66 slider – wear-resistant, corrosion-resistant, electrically insulating. Sliding design compensates radial and angular misalignment. Lightweight aluminum alloy – low inertia for high-speed operation. Maintenance-free – no lubrication required.

Key Technical Specifications

Parameter	Value
Brand	Apexcoupling
Model Series	DH (Cross Slider Coupling / Oldham Type)
Type	Flexible / Oldham / Cross Slider
Structure	Two aluminum hubs + center PA66 slider
Hub Material	High-strength aluminum alloy
Slider Material	Imported PA66 (polyacetal) – wear-resistant, corrosion-resistant, electrically insulating
Surface Treatment	Anodized
Backlash	Zero – no rotational clearance
Bore Tolerance	H7
Bore Diameter Range	4 – 25 mm (varies by model)
Outer Diameter Range	16 – 63 mm
Length Range	18 – 47 mm
Rated Torque	1.2 – 8 N·m (screw torque)
Maximum Speed	Up to 10000 RPM (depending on model)
Misalignment Compensation	Radial and angular
Fastening Method	Set screw (positioning screws)
Maintenance	None required – maintenance-free
Operating Temperature	-30°C to +100°C
Customization	OEM – custom bores and materials
Applicable Industries	Servo motors, stepper motors, encoders, resolvers, 3D printers, CNC machines, robotics, medical devices, automation equipment
Place of Origin	Guangdong, China

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

DH Series – Model Range & Specifications

Model	Outer Diameter (D) mm	Length (L) mm	Bore Range (d) mm	Screw Torque (N·m)	Set Screw Size
DH-16×18	16	18	4,5,6,6.35	1.2	M3
DH-20×23	20	23	5,6,6.35,7,8,9,9.525,10	2.5	M4
DH-25×28	25	28	6,6.35,8,9,9.525,10,11,12	2.5	M5
DH-32×33	32	33	8,9,9.525,10,11,12,12.7,14,15,16	2.5	M6
DH-40×35	40	35	8,9,9.525,10,11,12,14,15,16,18	2.5	M6
DH-50×38	50	38	10,11,12,12.7,14,15,16,19,20,22	5	M8
DH-63×47	63	47	15,16,19,20,22,24,25	8	M8

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

Product Structure

Two Aluminum Hubs – High-strength aluminum alloy, precision-machined with slots, anodized finish.
Center Cross Slider – Imported PA66 (polyacetal) engineering plastic, with matching slots at 90°.
Set Screw Fastening – Secure shaft fixation with positioning screws.

💡 How it works: The DH coupling consists of two aluminum hubs with axial slots and a center slider with matching slots at 90° on each side. As the coupling rotates, the slider slides within the grooves, accommodating radial and angular misalignment while transmitting torque with zero backlash. The PA66 slider provides electrical insulation between the two shafts, preventing ground loops in sensitive applications. The design provides zero backlash operation, which is crucial for precision control in encoders, servo systems, and automated machinery.

Product Features & Advantages

Advantage	Benefit
Zero Backlash	No rotational clearance – precise positioning for encoders, servo motors, and stepper motors
Imported PA66 Slider	Excellent wear resistance, corrosion resistance, and electrical insulation – long service life
Aluminum Alloy Hubs	Lightweight, low inertia – ideal for high-speed operation up to 10000 RPM
Sliding Misalignment Compensation	Effectively compensates radial and angular deviations – reduces stress on bearings and seals
Detachable Design	Easy installation and maintenance – no need to move connected shafts
Set Screw Fastening	Simple and secure shaft fixation
H7 Precision Bore	High concentricity and accurate shaft fit – reduces vibration
Anodized Finish	Enhanced corrosion resistance and professional appearance
Maintenance-Free	No lubrication required – reduces operating costs
Electrical Insulation	PA66 slider provides electrical isolation – prevents ground loops
OEM Customization	Custom bores and materials available

Why Choose an Oldham Coupling?

Oldham couplings (cross slider couplings) offer several key advantages for precision applications:

Zero Backlash: Essential for encoders, resolvers, and servo motors where accurate position feedback is required.
High Radial Misalignment Capacity: Accommodates significant lateral shaft offset – protects bearings from stress.
Electrical Insulation: The PA66 slider provides electrical isolation between shafts, preventing ground loops that can corrupt encoder signals.
Low Inertia: The lightweight aluminum design makes them ideal for high-speed operation and quick starts/stops.
Maintenance-Free: No lubrication required, reducing downtime and maintenance costs.

Applications

Servo Motors – High-precision motion control systems
Stepper Motors – Accurate positioning and step transmission
Encoders & Resolvers – Precision position feedback systems
3D Printers – Z-axis coupling, filament drive systems
CNC Machines – Small CNC machines, engraving machines
Robotics – Small robot joint drives
Medical Devices – Precision medical equipment
Automation Equipment – Pick-and-place systems, indexing tables
Laboratory Equipment – Precision testing and measurement instruments

Why Choose Apex Coupling for DH Oldham Couplings?

Advantage	Description
Factory Direct	Competitive B2B pricing – no middlemen
Premium Materials	Aluminum alloy hubs + imported PA66 slider
Zero Backlash	Precision performance for encoders, servo motors, and stepper motors
High Radial Misalignment Capacity	Protects bearings and seals from stress
Electrical Insulation	PA66 slider prevents ground loops
Lightweight & Low Inertia	High-speed capability – up to 10000 RPM
Set Screw Fastening	Simple and secure shaft fixation
H7 Precision Bore	High concentricity and accurate shaft fit
Maintenance-Free	No lubrication required – reduces operating costs
Wide Model Range	DH-16×18 to DH-63×47 – covers most applications
OEM Customization	Custom bores and materials available

FAQ

Q: What is a cross slider (Oldham) coupling?
A: A cross slider coupling (Oldham coupling) consists of two aluminum hubs with axial grooves and a center slider with matching slots at 90°. It transmits torque while accommodating radial and angular misalignment through the sliding action of the center slider.

Q: What is the advantage of the PA66 slider?
A: PA66 (polyacetal) provides excellent wear resistance, corrosion resistance, and electrical insulation – making it ideal for applications where electrical isolation between shafts is required.

Q: Does the coupling have backlash?
A: No. The DH series features zero backlash – no rotational clearance, ensuring precise positioning for encoders and servo motors.

Q: What misalignment can the coupling compensate for?
A: The sliding design compensates for radial (eccentricity) and angular misalignment.

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

Q: What are the common applications?
A: Servo motors, stepper motors, encoders, resolvers, 3D printers, CNC machines, robotics, and automation equipment.

Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom bores and materials available.

Q: What is the maximum speed?
A: Maximum speed is up to 10000 RPM depending on the model.

Request a Quote

Send us your model (e.g., DH-25×28), bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.