# PM Bulkhead Union Pneumatic Push-in Tube Connector

Date: 2026-07-11
Categories: Pneumatic Fittings
URL: https://homipneu.com/pm-pneumatic-bulkhead-union.html

## Product Summary

PM pneumatic fittings are **bulkhead straight union push-to-connect connectors** designed for connecting two air tubes through panels or barriers in pneumatic systems.

With a bulkhead structure, the PM series allows tubing to pass through walls, enclosures, or equipment panels while maintaining a secure and leak-free connection.

The push-to-connect design enables quick installation without tools, making it ideal for industrial automation, air routing systems, and compact equipment layouts.

**OEM and ODM customization services are available** for tube sizes, materials, sealing types, and branding requirements.

### Specification Parameters

**Operating Fluid**
Air, Vaccum, Water(no freezing)

**Body Material**
Brass

**Type**
[Pneumatic Fittings](https://homipneu.com/tag/pneumatic-fittings)

**Proof Pressure**
1.32 MPa (13.5 kgf/cm²)

**Max. Operating Pressure**
0~0.9 MPa (0~9.2 kgf/cm²)

**Ambient & Fluid Temperature**
0~60°C

**Lock Claw**
Stainless Steel(SUS)

**Applicable Tubing**
[PU](https://homipneu.com/product/pneumatic-fittings/pu-pneumatic-straight-union.html) Tube, Nylon Tube

![PM pneumatic bulkhead union straight push to connect air fitting](https://homipneu.com/wp-content/uploads/2026/04/20260428200029068031-800x440.webp)

**Model**
**Φ D × 2**
**B**
**E**
**M**
H × **2**

PM-4
4
28.5
8
M12×1
14

PM-6
6
31.5
10
M14×1
17

PM-8
8
33.5
11
M16x1
19

PM-10
10
37
12
M20x1
24

PM-12
12
40
14
M22× 1
27

### Key Features

- Bulkhead straight union structure

- Tube-to-tube connection through panel

- Push-to-connect quick installation

- Leak-proof sealing with O-ring

- Durable brass and engineering plastic construction

### Applications

- Pneumatic control panels

- Industrial automation systems

- Air distribution pipelines

- Machinery equipment

- Robotics and assembly lines

Widely used in pneumatic systems requiring **tube routing through panels, organized piping layout, and reliable air-tight connection**.

### Product Function

PM bulkhead union fittings are used to **connect two tubes on both sides of a panel or barrier**, allowing air lines to pass through obstacles safely and securely.

### Product Structure & Size Range

- PM4 / PM6 / PM8 / PM10 / PM12

- Tube sizes: 4mm → 12mm

- Equal union (both sides same tube size)

- Panel mounting with locking nut

### Why Choose Our Pneumatic Fittings

- Professional **PM pneumatic bulkhead fitting manufacturer** with full size range

- OEM / ODM customization for **panel mount push to connect fitting projects**

- Reliable **bulkhead union connector for pneumatic and automation systems**

- High-quality **air fitting factory China with strict QC system**

- Durable **push-in pneumatic fitting for panel-through air systems**

- Fast delivery and global B2B supply support

### FAQ

**Q1: What is a PM pneumatic fitting?**It is a bulkhead union fitting used to connect two tubes through a panel or wall.

**Q2: What is a bulkhead fitting used for?**It allows tubing to pass through panels or enclosures while maintaining a sealed connection.

**Q3: How does a push-to-connect bulkhead fitting work?**The tube is inserted into both ends, locked by internal teeth, and sealed by an O-ring.

**Q4: What is the working pressure of PM fittings?**Typical working pressure is up to around 1.0 MPa.

**Q5: Can PM fittings be customized?**Yes, OEM/ODM customization is available for size, material, and design.