373 Series Rotary Joint for Machine Tool Spindle Cooling
High-precision mechanical seal for CNC spindles, deep-hole drills and grinding machines
Overview
The 373 series rotary joint is a high-performance, high-precision mechanical sealing device developed for the machine tool industry — CNC spindles, deep-hole drills, milling and grinding machines — handling coolant, air and heat-transfer oil. The hardened stainless steel rotor shaft runs with vibration-free stability; the housing is aluminium alloy or brass; a well-balanced sealing arrangement minimizes friction; and the stationary ring is available in graphite or bronze to match different working conditions. Pressure ratings cover ≤10 bar for air, ≤70 bar for coolant and ≤105 bar for hydraulic oil, with temperature up to 120°C and speeds up to 6,000 RPM — or ≤1,500 RPM when air is the medium. Media, pressure and speed combinations are confirmed against your machine tool specification.
Images & Dimension Drawings
Key Features
- Hardened stainless steel shaft — smooth, vibration-free running
- Aluminium alloy or brass housing
- Balanced sealing arrangement minimizing friction
- Stationary ring in graphite or bronze for different conditions
- Speeds up to 6,000 RPM (≤1,500 RPM with air)
Typical Applications
Operating Conditions
| Media | Air, coolant, hydraulic oil |
|---|---|
| Max Pressure | ≤10 bar (air), ≤70 bar (coolant), ≤105 bar (hydraulic oil) |
| Max Temperature | 120°C |
| Speed Range | ≤6,000 RPM (≤1,500 RPM with air) |
| Notes | 373 series; hardened stainless steel shaft; aluminium alloy or brass housing; graphite or bronze stationary ring. Media/pressure/speed combinations confirmed per machine tool specification. |
Frequently Asked Questions
1 What is the 373 series through-spindle rotary joint, and what are its limits?
2 Can the 373 replace our existing spindle joint?
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Send Us Your Drawing or Duty Conditions
Tell us the medium, temperature, pressure, speed and connection size. Our engineers reply with a selection or a custom proposal — usually within one working day.