304 Stainless Steel Compression Fittings – Female Straight Coupling Connector

Match the fitting size to your tube's outer diameter (OD). For example, a 1/4" fitting accepts tubing with a 1/4" OD. The length dimension (e.g., 6mm ≈ 0.24", 8mm ≈ 0.31") refers to the ferrule engagement depth — generally, longer ferrule lengths provide a more secure grip on thicker-walled tubing. When in doubt, measure your tube OD with calipers before ordering.

304 stainless steel compression fittings generally handle working pressures up to 1,000–3,000 PSI depending on tube size and wall thickness. Smaller diameters typically support higher pressure ratings. Always verify the pressure rating against your system specifications and consult a qualified engineer for critical or high-pressure applications.

Yes. 304 stainless steel offers good resistance to atmospheric corrosion, moisture, and many mild chemicals, making it suitable for outdoor plumbing, marine-adjacent environments, and food-grade applications. For highly chlorinated or saltwater-immersion environments, 316 stainless steel is generally recommended instead.

The inch-size variants (1/8" through 1/2") typically use NPT (National Pipe Taper) or BSP threads depending on the specific SKU — please confirm the thread standard in the variant details or contact us before ordering if thread compatibility is critical. The M20×1.5 variants use metric threads with a 1.5mm pitch.

The length dimension refers to the ferrule or body engagement length. Longer lengths (e.g., 12mm ≈ 0.47") generally provide a deeper bite on the tubing, which can improve pull-out resistance and sealing on thicker-walled or higher-pressure lines. Shorter lengths (e.g., 6mm ≈ 0.24") are typically used in lighter-duty or space-constrained installations.

Each variant is sold in quantities of 1, 3, 5, or 10 pieces of the same size. To get multiple sizes, simply add each size as a separate line item to your cart. Buying in larger quantities (5 or 10 pcs) offers a lower per-unit cost, which is useful for repair kits or multi-line stainless steel tubing connector projects.

In most cases, two adjustable wrenches are sufficient — one to hold the fitting body and one to tighten the compression nut. No soldering or flaring is required. Ensure the tube end is cut cleanly and squarely for the best seal. Over-tightening can deform the ferrule, so generally 1–1.25 turns past finger-tight is recommended.