Steel 4-Bolt Flange Adapter, 1.25 Inch Code 61 Flange, O-Ring Half To 1.25 Inch Female NPT, Straight

Constructed from steel, this adapter is certainly durable and reliable, especially when used in high-pressure hydraulic and fluid power systems.

That's exactly what this fitting is built for. One end connects to a 1.25 inch Code 61 four-bolt flange using an O-ring half connection, and the other end is a 1.25 inch female NPT thread. Both the pad size and pipe size are 1.25 inch, so if your port matches that spec, you're good to go. The O-ring face seal on the flange side handles the sealing, so you won't need thread sealant on that end either.

For tying an SAE Code 61 4-bolt flange connection to a 1.25 inch female NPT port, this is the right style. It is a straight steel adapter with a 1.25 inch Code 61 flange on the O-ring half and a 1.25 inch female NPT on the other end.