Also available in 304 stainless: -4AN | -6AN | -8AN | -10AN | -12AN | -16AN | All AN weld bungs
Same size in: 6061 aluminum
304 STAINLESS MALE AN WELD BUNG: A WELD-IN 37° FLARE PORT FOR FUEL, OIL AND COOLANT LINES
This -20AN male weld bung is CNC machined from 304 stainless with a 37° AN flare on the threaded end. Weld it to stainless tanks, oil pans, turbo oil drains and coolant lines, and a -20AN female hose end or fitting threads straight onto it.
AN fittings seal metal to metal on the 37° flare, not on the threads, so no tape or thread sealant is needed. Keep the flare clean and undamaged and it will seal again every time the line comes off.
FEATURES
- 37° AN flare (SAE J514), 1-5/8-12 UNF thread
- CNC machined from 304 stainless
- Suitable for fuel systems, including E85
- Weld to stainless only, with a matching stainless filler
Full specifications (thread, diameters, height) are listed in the spec table at the bottom of this page.
WHAT CONNECTS TO IT
- Female AN hose ends and swivel fittings in the same dash size
- AN flare caps, for blanking the port off
45° SAE flare fittings look similar but will not seal on a 37° AN flare. Don't mix the two.
DASH SIZE REFERENCE
The dash number is the tube or hose OD in sixteenths of an inch.
| Size | Tube OD | Thread |
|---|---|---|
| -4AN | 0.250" | 7/16-20 |
| -6AN | 0.375" | 9/16-18 |
| -8AN | 0.500" | 3/4-16 |
| -10AN | 0.625" | 7/8-14 |
| -12AN | 0.750" | 1-1/16-12 |
| -16AN | 1.000" | 1-5/16-12 |
| -20AN (this bung) | 1.250" | 1-5/8-12 |
WELDING TIPS
- Thread an AN cap or a spare female fitting on before welding. It protects the flare from spatter and helps the threads hold their shape.
- Tack it, then weld in short sections, alternating sides to keep heat even.
- Let the bung cool completely before removing the cap.
- Inspect the flare after welding and clean off any spatter before connecting a line.
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 AN fittings and hose.
