Waterproof Through Bore Slip Ring – Ø25mm ID / Ø78mm OD, 4 Circuits × 10A, IP65, 360° Rotary Electrical Connector
1. Overview
The DHK025F-4-10A-002 belongs to the proven DHK025 series platform — a family of waterproof, through-bore conductive slip rings specifically engineered for rotating applications that require a central passage ≤ 25 mm, such as drive shafts, pneumatic/hydraulic lines, or optical fibers. The “002″ suffix identifies this configuration: 4 power circuits, 10 A per circuit, IP65 protection, with customized lead length and mounting interface.
With its compact envelope (Ø78 mm OD × 28 mm length) and sealed aluminum alloy construction, this model offers an optimal balance of power density, environmental protection, and cost-effectiveness for industrial OEMs.
2. Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | DHK025F-4-10A-002 |
| Inner Diameter (Bore) | Ø25 mm (compatible with shafts ≤ Ø25 mm) |
| Outer Diameter | Ø78 mm |
| Overall Length | 28 mm |
| Number of Circuits | 4 |
| Rated Current | 10 A per ring (4 rings) |
| Rated Voltage | 0–400 VAC |
| Insulation Resistance | ≥1000 MΩ @ 1000 VDC |
| Dielectric Strength | 1000 VAC @ 50 Hz, 60 s, 1 mA |
| Dynamic Contact Resistance | < 10 mΩ |
| Operating Speed | 0–100 rpm (higher speeds available on request) |
| Operating Temperature | -20 ℃ ~ +80 ℃ |
| Operating Humidity | < 70 % |
| Protection Level | IP65 (IP66 / IP68 optional) |
| Housing Material | Aluminum Alloy |
| Contact Material | Precious metal (gold-to-gold / noble metal alloy) |
| Lead Wire Length | 500⁺⁵₀ mm (customizable) |
| Installation | Flange mounting (standard); collar mounting optional |
3. Engineering Highlights
True Through-Bore Design (Ø25 mm)
The central hole allows drive shafts, hydraulic/pneumatic tubing, or fiber optic cables to pass directly through the slip ring — eliminating the need for external routing and saving valuable assembly space.
IP65 Waterproof & Dustproof Protection
The integrated sealing structure with waterproof cable glands ensures reliable operation in humid, rainy, dusty, or light-washdown environments. Higher ratings (IP66 / IP68) are available for underwater or high-pressure washdown applications.
Precious Metal Multi-Point Brush Technology
Using advanced precious metal fiber brush wires, each brush bundle makes multiple contact points with the ring surface. This delivers:
- Ultra-low and stable dynamic resistance (< 10 mΩ)
- Minimal electrical noise
- Extremely low friction and wear
- Maintenance-free, lubrication-free operation
4 × 10 A Power Transmission
Each of the 4 independent circuits carries up to 10 A at voltages up to 400 VAC — sufficient for driving motors, actuators, heaters, or combined power + signal applications within a single compact unit.
Rugged Aluminum Alloy Housing
The corrosion-resistant aluminum body withstands industrial and semi-outdoor conditions across a -20 ℃ to +80 ℃ temperature range. Stainless steel housing is available for marine/offshore use.
360° Continuous Rotation
Supports unrestricted continuous rotation, eliminating cable twist and extending system reliability.
4. Typical Applications
- Surveillance & Security: PTZ cameras, dome cameras, radar antennas
- Industrial Automation: robotic joints, rotary indexing tables, CNC rotary axes
- Medical Equipment: CT scanners, rotating surgical lamps, MRI platforms
- Marine & Offshore: underwater vehicles, offshore wind turbines, shipboard radar
- Display & Advertising: rotating LED screens, exhibition turntables
- Packaging & Machinery: filling machines, capping machines, labeling machines, cable reels
- Cleaning Equipment: rotary washing heads, industrial cleaning machines
5. Customization Options
To adapt the DHK025F-4-10A-002 to your exact application, the following parameters can be modified:
- Circuit configuration: change number of power rings or add signal rings (CAN, RS485, Ethernet, etc.)
- Current rating: 2 A / 5 A / 15 A / 20 A per ring options available
- Protection level: upgrade to IP66 or IP68 for underwater use
- Lead wire: length, color-coding, and termination (aviation plug, terminals, etc.)
- Mounting: flange pattern, collar style, or custom interface
- Housing material: aluminum alloy (standard) or stainless steel (marine)
- Hybrid integration: combine with hydraulic/pneumatic rotary joints or fiber optic rotary joints (FORJ)
