What size is a shower arm flange?
1/2″
This shower arm escutcheon fits any standard shower arm. Fits standard 1/2″ shower arm.
What size is a shower flange?
The standard thread size for modern-day shower heads in the United States is 1/2-inch NPT.

Are shower flanges universal?
The tube and flange has a universal design that fits most faucets and features a brass, zinc and plastic construction. Tube: 3 in. Length x 1-1/4 in. O.D.
What is the flange on a shower?
Shower Components used as a pipe hole cover are called shower flanges. Shower flanges cover the hole where the shower arm attaches to the rough pipe in the wall. Shower arm wall plate flanges or escutcheons are decorative shower parts that give you a polished and finished design.
Are all shower flanges the same size?

The standard thread size for modern-day shower heads in the United States is 1/2-inch NPT. Since the size of shower head threads is standardized, simply select the style of shower head you desire without worrying about fit. Amy Kingston has been a professional writer since 2001.
What size are shower arm threads?
Standard shower arms (the pipe that comes out of the wall) have a 1/2″ male pipe thread, and standard shower heads have a 1/2″ female pipe thread.
Are shower arms universal size?
The good news is that for most homes, there is a straightforward answer: Showerheads have a universal thread size in the United States and Canada, which is designated as ½-inch NPT. As a result, any locally sold showerhead should be compatible with your shower arm.
Are shower head threads universal?
The majority of modern shower heads are universal as they standardize on half-inch pipe threads. This includes both National Pipe Thread (NPT) as well as British Standard Pipe (BSP). First, 99 percent of shower heads sold everywhere are compatible with standard pipe sizes.