1101-202-651 rotary joints

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Introduction

The SD 1101-202-651 rotary joint (rotary union) is a single-passage rotating connection designed to transfer coolant or MQL (Minimum Quantity Lubrication) media from a stationary supply line into a rotating machine component. It is commonly used in CNC machine tools, machining centers, and spindle coolant systems.

Product Overview

Model: 1101-202-651
Manufacturer:SD
Type: Single passage rotary union
Media: Coolant, air, MQL
Rotor connection: M16 × 1.5 LH
Pilot diameter: 17.99 mm (18 mm)
Supply connection: 3/8″-19 PT

Key Features

1. Closed Seal Technology

The 1101 series uses a closed-seal design that reduces unnecessary seal wear by keeping the sealing surfaces closed when media is not flowing. This improves service life in CNC spindle applications.

2. Full-Flow Design

The internal full-flow passage minimizes restrictions and helps prevent chips, swarf, or debris from becoming trapped inside the rotary joint.

3. Bearing-Supported Rotor

The threaded rotor design includes bearing support, allowing easier installation and helping absorb spindle thrust loads caused by coolant pressure.

4. Durable Seal Construction

The unit uses balanced mechanical seals made from silicon carbide, providing long operating life under demanding machining conditions.

5. Corrosion Resistance

Anodized aluminum components improve resistance against corrosion in industrial environments.

Technical Specifications

Typical Applications

The SD 1101-202-651 is suitable for:

• CNC machining centers
• High-speed spindle coolant delivery
• MQL lubrication systems
• Transfer lines requiring rotating fluid connections
• Machine tool spindle applications

Advantages

• Compact design
• High-pressure coolant capability
• Long seal life
• Easy replacement and installation
• Suitable for modern CNC spindle systems
• Reliable operation in contaminated machining environments

Maintenance Recommendations

To maximize service life:

• Use clean coolant and proper filtration
• Avoid running outside rated pressure and temperature limits
• Check for leakage during scheduled machine maintenance
• Ensure correct LH rotor installation direction
• Replace seals or the complete rotary union when leakage occurs

Conclusion

The SD 1101-202-651 rotary joint is a reliable industrial rotary union designed for CNC coolant and MQL applications. Its closed-seal technology, bearing-supported design, and high-pressure capability make it suitable for demanding machining environments where consistent coolant delivery is required.

Model: SD1101-202-651
Connection method: flange thread
Scope of application: Rotating joints for mechanical engineering
Place of Origin: China
Whether to import: No
Customized processing: Yes
Applicable media: gas, oil, vacuum, water, nitrogen, coolant, hydraulic oil
Speed: 3800RPM
Pressure: ≤ 3.0MPA
Temperature: ≤ 100 ℃
Material: Aluminum alloy, stainless steel
Single channel coolant or MQL;
Closed sealing, automatic line or similar applications;
Full flow design, no debris or burr blockage;
Bearing support, threaded swivel, easy to install;
Deep groove radial ball bearings operate smoothly;
Adopting labyrinth seal and large outlet protection ball bearings;
Balanced machine seal, made of silicon carbide material, can extend the service life even under harsh working conditions;