Tube Adapters, Nuts & Sleeves

The Professional Solution for Rigid Hardline Plumbing

For projects that demand a permanent, high-precision finish, rigid hardlines are the industry standard. At AN Fittings NZ, our collection of Tube Adapters, Nuts, and Sleeves provides the hardware necessary to convert standard metal tubing into a high-performance AN flare system. Whether you are plumbing a custom fuel line along a chassis rail, setting up a pneumatic air system, or building a high-end hardline engine bay, these components ensure a secure, leak-free transition to your flexible hose ends.

By using a Nut and Sleeve combination, you can create a mechanical seal on flared tubing that is significantly more reliable and aesthetically cleaner than traditional "barbed" or "clamped" connections.

Components for a Precision Hardline System

Building a hardline system requires specific hardware designed to work with flared metal tubing:

  • Tube Nuts (AN 818): These slide over the tubing before flaring and provide the threaded connection to your male AN fitting. Available in high-grade aluminum for fuel and oil, or steel for high-pressure hydraulic applications.

  • Tube Sleeves (AN 819): Positioned behind the flared end of the tube, the sleeve acts as a load-bearing surface that ensures the nut applies even pressure to the flare seat, creating a 100% metal-to-metal seal.

  • Tube Adapters: Specialized fittings designed to transition directly from a compression-style tube connection to a standard AN flare, allowing you to bridge the gap between OEM hardlines and aftermarket performance plumbing.

  • Material Options: We stock components in 6061-T6 Aluminum for lightweight performance and Steel/Stainless Steel for maximum durability in high-vibration or high-pressure environments.

Engineered for NZ Fabricators & Restorers

From classic car restorations requiring clean fuel lines to modern drift builds needing secure air-jack plumbing, our Speedflow and performance tube hardware are the trusted choice in New Zealand. These components are designed for use with standard 37-degree flaring tools, ensuring a professional result that meets the highest motorsport standards.

Achieve a permanent, professional finish with our hardline adapters and sleeves. Browse our range below for fast shipping across New Zealand.