Radium Engineering -6AN Adapter Fittings

Every custom fuel system dies or thrives on the adapters that bridge factory threads to AN plumbing.

Metric ports, SAE line ends, NPT bosses, bulkhead pass-throughs: real cars mix them all, and 6AN hose has to meet each one cleanly. Radium Engineering 6AN Adapter Fittings cover the conversions a fuel system build actually runs into, from SAE male line adapters to metric threads, barbs, couplers, and bulkheads, all in anodized aluminum that is safe with every fuel. Select the exact fitting from the option list. The right thread, the first time.

What You'll Feel

• Clean transitions from factory hard lines and metric ports to 6AN hose
• Leak-free confidence with properly matched threads instead of improvised adapters
• Tidy tank and panel pass-throughs using the bulkhead options with jam nuts
• One listing covering the odds and ends that stall a fuel system install

Features

• Anodized aluminum construction, compatible with all fuel types including E85
• SAE line adapters: 5/16" SAE male, 3/8" SAE male, and 1/2" SAE male to 6AN male
• Thread conversions: 8AN ORB to 6AN male, 6AN to 3/8" NPT male, 6AN to 1/4" NPT male 90-degree, 6AN to M12x1.5 male, 6AN to M18x1.5 male
• Barb and coupler options: 6AN male or female to 8.5mm barb, 6AN male to 1/4" barb, 6AN female-to-female couplers in straight and 90-degree
• Bulkhead options: 6AN with jam nut, and M12x1.5 to 6AN with jam nut

The Details

Choosing the right adapter starts with identifying both sides of the joint. AN connections seal on a 37-degree flare, ORB fittings seal on an O-ring against a flat boss, NPT threads seal on taper (use PTFE paste), and SAE quick connect ends mate to the factory-style line fittings found on most modern fuel systems. The SAE male adapters in this listing convert the hard line side of those factory connections to 6AN, which is the usual first step in adapting OEM plumbing to aftermarket hose. Bulkhead fittings pass a line through a tank wall, surge tank plate, or chassis panel and lock with a jam nut, keeping the penetration sealed and strain-free. The metric options handle the M12x1.5 and M18x1.5 ports common on OEM components. Fittings are sold individually, so map out your system and order each joint's adapter by thread, not by guesswork.

Kit Includes

• 1x Fitting per selected option

Applications

• Universal: 6AN fuel system plumbing, surge tank and fuel cell builds, factory-to-AN line conversions
• Compatible with all fuel types including ethanol blends such as E85