Brass Compression Union Straight Coupling – 4–16mm & Imperial
Brass Compression Union Straight Coupling – 4–16mm & Imperial
Brass Compression Union Straight Coupling — Multi-Size Adapter Fitting
Achieve a secure, leak-free connection every time with this heavy-duty Brass Compression Union Straight Coupling. Available in a wide range of metric and imperial sizes — 4, 5, 6, 8, 10, 12, and 16 mm as well as 1/8", 3/16", 1/4", 5/16", 3/8", and 1/2" — this versatile adapter is the go-to solution for instrumentation, hydraulic, and pneumatic systems.
Made in Mainland China.
Key Features
- Hex grip on both sides: The hex-head design on both ends ensures excellent grip for easy installation and removal using standard wrenches.
- Universal compatibility: Works seamlessly with copper, brass, aluminum, and plastic tubing — ideal for converting between different tube sizes and materials.
- Heavy-duty brass construction: Rust-proof, corrosion-resistant, and built to handle high temperatures with low magnetic permeability for lasting performance.
- Deep, precision threads: High-quality deep threads allow the fitting to bite firmly, delivering a perfect compression seal for a dependable leak-free connection.
- Three-piece design: Consists of a nut, sleeve, and body with an attached insert — the standard compression fitting configuration for a reliable, robust seal.
- Wide size range: Metric (4–16 mm) and imperial (1/8"–1/2") options available to suit virtually any plumbing or fluid-system project.
- Max pressure rating: Suitable for systems up to 850 kPa.
Specifications
| Material | Brass (Copper alloy) |
| Connection Type | Compression Union / Straight Coupling |
| Available Sizes (Metric) | 4, 5, 6, 8, 10, 12, 16 mm |
| Available Sizes (Imperial) | 1/8", 3/16", 1/4", 5/16", 3/8", 1/2" |
| Color | Gold (Brass) |
| Max Pressure | < 850 kPa |
| Typical Applications | Instrumentation, hydraulic systems, pneumatic systems |
| Package Contents | 1 × Brass Compression Union Straight Coupling |
| Origin | Mainland China |
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Frequently Asked Questions
Q: What types of tubing are compatible with this brass compression coupling?
A: This brass compression union straight coupling is compatible with copper, brass, aluminum, and plastic tubing. Its three-piece construction (nut, sleeve, and body with insert) provides a firm, leak-free grip on all these tube materials, making it highly versatile for plumbing, instrumentation, and fluid-system projects.
Q: What sizes are available for this compression fitting?
A: The fitting is available in both metric sizes — 4, 5, 6, 8, 10, 12, and 16 mm — and imperial sizes — 1/8", 3/16", 1/4", 5/16", 3/8", and 1/2". This broad size range ensures compatibility with most standard tubing used in hydraulic, pneumatic, and instrumentation systems.
Q: What is the maximum pressure this compression coupling can handle?
A: This brass compression straight coupling is rated for system pressures below 850 kPa. It is well-suited for typical instrumentation, pneumatic, and low-to-medium-pressure hydraulic applications. Always verify your system's pressure requirements before installation.
Q: Is any special tool required to install this fitting?
A: No special tools are needed. The hex-head design on both sides of the coupling provides excellent grip for a standard wrench, making installation and removal straightforward for both professionals and DIY users.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.