AN fittings are typically made out of aluminum alloy or stainless steel materials for their strength, durability, and corrosion resistance properties. Aluminum alloy AN fittings are lightweight and offer excellent resistance against rusting or oxidation. They are commonly used in applications where weight savings are critical while maintaining reliability. Stainless steel AN fittings provide superior strength and resistance to harsh environmental conditions like high temperatures or chemicals. They are often preferred in high-performance applications or where added durability is required. Both materials offer excellent machining capabilities for precision manufacturing of threads and sealing surfaces necessary for reliable connections in the fuel system.