Schroeder has a line of reservoir weld flanges. These flanges have SAE female O-ring port threads and are intended to be welded into a reservoir.
Unit of Measure

Specifications

Port Thread Size

 1 7/8 in. - 12 UNF-2B

SAE Size

 SAE 24

Type

 SAE female O-ring port threads and are intended to be welded into a reservoir.

Material

 Forged Steel

Finish

 Black Phosphate (Suitable for Welding)

Dimensions

Outside Diameter

 3 in76 mm

Hole Diameter

 2.25 in57 mm

Flange Thickness

 0.5 in13 mm

Hub Diameter

 2.38 in60 mm