PM Push-to-Connect Bulkhead Union Fitting – 4–12mm Tube, 1/8”–1/2” Thread, Quick Release

PM-series bulkhead union fittings provide a panel-mount push-to-connect interface — allowing pneumatic tubing to pass through a panel, enclosure wall, or manifold with a quick-release connection on one or both sides. The fitting threads into a panel hole from one side; tubing inserts into the push-in collet on the exposed side. This eliminates the need for tube fittings on both sides of a panel penetration, simplifying installation and enabling tool-free tube disconnection for maintenance access.

Key Specifications

• Series: PM (Panel Mount bulkhead union, push-to-connect)
• Tube OD: 4mm, 6mm, 8mm, 10mm, 12mm (select above)
• Thread: 1/8”, 1/4”, 3/8”, 1/2” BSP or NPT (select above)
• Body Material: Brass or nickel-plated brass
• Seal: Collet + O-ring (push-to-connect end); thread sealant or O-ring (panel thread end)
• Working Pressure: 0–1.5 MPa (0–218 PSI)
• Temperature Range: -20°C to +80°C
• Media: Compressed air, water, light oil

PM Bulkhead vs Standard Push-In Fitting — When to Use Bulkhead

• Standard push-in fitting: Connects tube to a threaded port on a valve, cylinder, or manifold. No panel penetration.
• PM bulkhead (this product): Mounts through a panel hole. Allows tubing to pass from inside an enclosure to outside (or vice versa) with a sealed, push-to-connect interface. Used for: pneumatic enclosure penetrations, manifold panel connections, machine frame tube routing, and any application where tubing must cross a physical barrier.

What Questions Does This Product Answer?

• "What panel hole size do I need for a PM fitting?" — The panel hole size matches the fitting’s thread OD: 1/8” BSP ≈ 9.7mm hole; 1/4” BSP ≈ 13.2mm hole; 3/8” BSP ≈ 16.7mm hole; 1/2” BSP ≈ 20.9mm hole. Use a step drill or hole saw of the correct diameter.
• "Can I use PM fittings on both sides of a panel?" — Standard PM fittings have a push-in collet on one side and a threaded body on the other (for panel mounting). For push-in connections on both sides, use a through-bulkhead union (PB series) which has collets on both ends.
• "Do PM bulkhead fittings seal the panel hole?" — Yes. The fitting body includes a sealing washer or O-ring that seals against the panel surface when the locknut is tightened. This prevents air, dust, and moisture from passing through the panel hole around the fitting body.
• "What is the maximum panel thickness for PM fittings?" — Typically 1–3mm for standard PM fittings. For thicker panels, use extended-body PM fittings or add a spacer washer behind the panel. Verify the fitting’s thread engagement length against your panel thickness.

Typical Applications

• Pneumatic enclosures: Routing air supply and exhaust lines through control cabinet walls
• Machine frames: Passing tubing through structural members and frame panels
• Manifold panels: Connecting external tubing to internal manifold circuits through a panel interface
• Modular systems: Creating standardized pneumatic connection points on equipment panels for field reconfiguration

Package Contents

5 pieces — PM push-to-connect bulkhead union fittings (tube OD and thread size as selected above). Locknut and sealing washer included.