NPT Male Thread Compression Tube Fitting 4–12mm OD | M5–1/2"
NPT Male Thread Compression Tube Fitting 4–12mm OD | M5–1/2"
Details
NPT Male Thread Compression Tube Fitting Connector
Keep your pneumatic and vacuum lines sealed tight with this precision-engineered compression tube fitting connector. Available in a wide range of thread sizes (M5, 1/8", 1/4", 3/8", and 1/2" NPT/BSPT) and tube outer diameters (4, 6, 8, 10, and 12mm), this versatile fitting is an essential component for air lines, vacuum systems, and fluid transfer applications. The nickel-plated copper body ensures excellent corrosion resistance and long-lasting durability.
Made in Mainland China.
Key Features
- Wide Size Compatibility: Fits tube ODs of 4mm, 6mm, 8mm, 10mm, and 12mm — covering the most common pneumatic line sizes.
- Multiple Thread Options: Available in M5, 1/8", 1/4", 3/8", and 1/2" male taper thread (NPT/BSPT) for maximum versatility.
- Nickel-Plated Copper Body: Corrosion-resistant finish extends the service life even in demanding environments.
- Air & Vacuum Rated: Suitable for air and vacuum fluid types with a proof pressure of 1.32 MPa (13.5 kgf/cm²).
- Reliable Seal: Ferrule-style compression design creates a secure, leak-free connection — no sealant tape required on the tube side.
- Compatible Tube Materials: Works with PU (Polyurethane) and Nylon tubing.
Full Specifications
| Model | PC / KTPC |
| Male Thread Sizes | M5, 1/8", 1/4", 3/8", 1/2" BSPT/NPT |
| Tube Outer Diameter | 4mm (0.16"), 6mm (0.24"), 8mm (0.315"), 10mm (0.395"), 12mm (0.47") |
| Fluid Type | Air / Vacuum |
| Proof Pressure | 1.32 MPa (13.5 kgf/cm²) |
| Operating Pressure | 0 – 0.9 kgf/cm² (0 – 9.2 MPa) |
| Negative Pressure | –750 mmHg (10 Torr) |
| Operating Temperature | 0°C – 60°C (32°F – 140°F) |
| Compatible Tube Materials | PU / Nylon / Polyurethane |
| Material / Finish | Copper, Nickel-Plated |
| Package Contents | 1 × Compression Fitting Connector |
Thread Size Reference Guide
- 01 = 1/8"
- 02 = 1/4"
- 03 = 3/8"
- 04 = 1/2"
Ideal Applications
This compression fitting is perfect for pneumatic automation systems, air compressor line connections, vacuum pumps, industrial machinery, and DIY workshop setups. Its standard thread sizes make it compatible with the majority of commercially available fittings and valves.
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Frequently Asked Questions
Q: What tube materials are compatible with this compression fitting connector?
A: This NPT male thread compression fitting is designed to work with PU (Polyurethane) and Nylon tubing. It is not recommended for use with metal, rubber, or silicone tubing.
Q: Do I need thread sealant tape when installing this fitting?
A: It is recommended to use PTFE thread seal tape on the male NPT/BSPT threads to ensure a leak-free connection with the receiving port. The ferrule compression side creates its own seal directly on the tube — no additional sealant is needed there.
Q: What is the maximum operating pressure for this compression tube fitting?
A: The maximum operating pressure is 0.9 kgf/cm² (approximately 9.2 MPa), with a proof pressure of 1.32 MPa (13.5 kgf/cm²). It also supports negative pressure down to –750 mmHg, making it suitable for vacuum line applications.
Q: How do I select the correct size compression fitting for my application?
A: You need to match two dimensions: (1) the outer diameter (OD) of your tube — choose from 4, 6, 8, 10, or 12mm — and (2) the thread size of the port you are connecting to — available in M5, 1/8", 1/4", 3/8", or 1/2" NPT/BSPT. Always verify both measurements before ordering.
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.
Materials + Care
We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.
Shipping + Returns
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