Also available in 6061 aluminum: -6AN | -8AN | -10AN | -12AN | -16AN | -20AN | All AN weld bungs
Same size in: 304 stainless
6061 ALUMINUM FEMALE AN WELD BUNG: A STEPPED WELD-IN O-RING BOSS (ORB) PORT
This -4AN female weld bung is CNC machined from 6061-T6 aluminum with a -4 O-ring boss (ORB) port. Weld it to tanks, catch cans, radiators and surge tanks, then thread in any -4 male ORB fitting: an ORB-to-AN adapter to run a hose, or an ORB plug to blank it off.
ORB ports seal with an O-ring on the male fitting, which compresses against the chamfer at the top of the port. The straight threads only hold the fitting in place, so no tape or thread sealant is needed, and the fitting can be removed and reused.
FEATURES
- Female ORB port (SAE straight thread), 7/16-20 UNF
- CNC machined from 6061-T6 aluminum
- Stepped body locates the bung in the hole and adds weld area
- Suitable for fuel systems, including E85
- Weld to aluminum only, with a matching aluminum filler
Full specifications (thread, body and shoulder diameter, height) are listed in the spec table at the bottom of this page.
WHAT CONNECTS TO IT
- Male ORB fittings in the same dash size, with their O-ring: ORB-to-AN adapters, ORB plugs, ORB-to-NPT adapters
A male AN flare fitting or an NPT fitting will not seal in an ORB port. Use an ORB fitting with its O-ring.
CUTTING THE HOLE
The stepped body drops into the hole and the shoulder sits flat on the surface. Cut the hole to the body diameter in the spec table so the bung fits snug and sits square while you tack it.
WELDING TIPS
- Thread an ORB plug in before welding. It acts as a heat sink and helps keep the threads from distorting.
- Tack it, then weld in short sections, alternating sides to keep heat even.
- Let the bung cool completely before removing the plug.
- Keep spatter off the chamfer and top face. That is where the O-ring seals.
SAFETY: Never weld, drill or grind on a tank that has held fuel.
Material tolerances: Diameters and heights in the spec table are nominal. Machined dimensions are subject to standard tolerances, so measure your parts before cutting holes. Nominal dimensions; material tolerances apply.
Shop all AN weld bungs and ORB adapter fittings.
