Download installation and maintenance manuals, order spare parts, and find tutorial videos to help with your chip conveyor installation and operation.
Download installation and maintenance manuals, order spare parts, and find tutorial videos to help with your chip conveyor installation and operation.
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Hennig Power Protection is a dedicated division specializing in custom-engineered generator enclosures, fuel systems, and power infrastructure for mission-critical applications across data centers, healthcare, telecommunications, and industrial facilities.
Precision machining, fabrication & welding services from our Rockford, IL facility. Complete manufacturing solutions with ISO-certified quality.
Precision machining for turbine...
Pallet delivery, robotic tending & software for lights-out production
CNC machining centers, lathes, grinders & multi-axis equipment
Safety systems & rod locks for hydraulic & mechanical presses
Leak-free fluid transfer with high-speed, high-pressure rotary unions.
A rotary union is a mechanical device that transfers liquid or gaseous media from a stationary source to a rotating component. OTT-JAKOB offers a comprehensive range of rotary unions, including single-passage and dual-passage configurations, tailored for applications involving hydraulics, air, coolant, MQL, internal spindle cooling, and cryogenic machining.
| Key Features | |
| Advanced Sealing Technology | Permanently closed sealing surfaces compatible with all conventional media, allowing for unlimited dry machining and minimal leakage. |
| High-Quality Hybrid Bearings | Low friction coefficients and extended grease service life ensure long-term functionality at high speeds. |
| Labyrinth Seal Protection | Effectively shields bearings from contamination, maximizing lifespan. |
| 360° Rotatable Coolant Connection | Facilitates easier installation and flexible integration. |
| Radial and Axial Connections | Available in both orientations to suit various machine configurations. |
The installation diameters of 48 mm (GD) and 32 mm (GDP) defined by OTT-JAKOB have become industry standards, ensuring compatibility and ease of integration.
Suitable for a wide range of machining operations, including milling, boring, and high-speed applications, with options for higher flow rates, higher speeds, limited space, and integrated leakage sensors.
OTT-JAKOB offers repair services for worn or defective rotary unions, restoring them to original quality standards and providing warranties equivalent to new parts.
Designed for efficient transfer of a single medium, typically hydraulic oil, these units are directly mounted to the spindle shaft. They offer a robust, cost-effective solution for reliable media delivery, ideal for hydraulic tool-release systems requiring stable, leak-free operation.
Dual-passage rotary unions simultaneously transfer two separate media—such as hydraulic oil paired with coolant or compressed air—through dedicated channels. Mounted directly to the spindle shaft, they provide versatile integration and reliable separation of media for optimal machine performance.
GD and GDP series rotary unions feature permanently closed sealing surfaces, enabling compatibility with all common media types, including coolant, air, and oil. Equipped with high-quality hybrid bearings and labyrinth seals, these units offer superior durability and consistent performance across high-speed machining applications.
Depending on the media required, various configurations of our dual-passage rotary unions are available.
| Specification | 1K-Oil | 2KA | 2KA Universal | 2KA-SR | 2KA-SR Universal | 2KL | 2KLR |
| Channels | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
| RPM max. | 10,000 min⁻¹ | 10,000 min⁻¹ | 10,000 min⁻¹ | 8,000 min⁻¹ | 8,000 min⁻¹ | 10,000 min⁻¹ | 20,000 min⁻¹ |
| Hydraulic unclamping | yes | yes | yes | yes | yes | yes | yes |
| Hydraulic pressure | 160 bar | 160 bar | 160 bar | 160 bar | 160 bar | 160 bar | 160 bar |
| Cleaning air pressure max | 10 bar | 10 bar | 10 bar | 10 bar | 10 bar | 10 bar | |
| Suitable for dry operation | yes | yes | yes | yes | |||
| Air during rotation | yes | yes | yes | ||||
| Air pressure max | 5 bar | 5 bar | 10 bar | ||||
| RPM max | 10,000 min⁻¹ | 8,000 min⁻¹ | 20,000 min⁻¹ | ||||
| Coolant | yes | yes | yes | yes | |||
| Pressure KSM max | 80 bar | 80 bar | 80 bar | 80 bar | |||
| KSM connection | radial | radial | radial | radial | |||
| KSM passage | 5.0 mm | 5.0 mm | 5.0 mm | 5.0 mm | |||
| MMKS | yes | yes | |||||
| MMKS pressure | 5 bar | 5 bar | |||||
| MMKS RPM max. | 10,000 min⁻¹ | 10,000 min⁻¹ | |||||
| Inside cooling housing | opt. | opt. | opt. | opt. | |||
| Mounting type Connection thread |
Thread M42 x 1.5 M52 x 1.5 |
Thread M42 x 1.5 M52 x 1.5 |
Thread M42 x 1.5 M52 x 1.5 |
Thread M42 x 1.5 M52 x 1.5 |
Thread M42 x 1.5 M52 x 1.5 |
Thread M42 x 1.5 M52 x 1.5 |
Thread M42 x 1.5 M52 x 1.5 |
All common variants of the dual-passage rotary unions are available with M42 × 1.5 and M52 × 1.5 connecting threads and with or without a signal ring. A flange-mounted version is also available.
| GDR-LC | GDR | GD | GDP-LC | GDP | |
| Rotation speed max. [min⁻¹] | 16000 | 24000 | 36000 | 36000 | 75000 |
| Coolant pressure | 50 bar | 80 bar | 80 bar | 80 bar | 80 bar |
| Channel Ø [mm] | 6 | 6 | 6 | 3.5 | 3.5 |
| Minimum volume lubrication [mixed externally] pmax | 5 bar | 5 bar | 5 bar | 5 bar | 5 bar |
| Cleaning air max.; [n = 0 min⁻¹] | 10 bar | 10 bar | 10 bar | 10 bar | 10 bar |
| Pressure air max.; [n < 10,000 min⁻¹] | 5 bar | 5 bar | 5 bar | 5 bar | 5 bar |
| Order number [with axial connection] | 9525003720 | 9525002510 | 9525002230 | 9525007120 | 9525014720 |
| Order number [with radial connection] | 9525006520 | 9525002330 | 9525002130 | 9525006820 | 9525014220 |
In the machining process, it can often be difficult for machinists to chase down the source of particular issues. Poor surface finish, rapid tool wear, taper corrosion, machine downtime, and tool breakage can each have multiple causes. However, there is one thing that can impact all of these: the pull-force of a spindle’s tool clamping system.
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Choosing the wrong tool clamping system partner can be a serious mistake. Old-school CNC machine tool clamping solutions may need extra maintenance, experience shorter lives, and can even be hazardous to operators. So, what do we recommend? OTT-JAKOB!
We’re all familiar with the products of Industry 4.0--it encompasses the smartphones in our pockets and tire pressure monitors in our cars. Learn how OTT-JAKOB is bringing the fourth industrial revolution to your spindle.
Both Hennig and its sister company, Advanced Machine & Engineering, now operate under the Hennig brand.
Same team. Same products. Same company. Different look.
Unifying the two brands under one name clarifies our offerings and makes them easier for you to navigate — one website, one team, one trusted partner.
