The thread size for a shotgun cleaning rod can vary depending on the manufacturer and the specific cleaning kit you have. However, a common thread size for shotgun cleaning rods is 5/16-27, which means the rod has a 5/16-inch diameter with 27 threads per inch.
It's important to check the threading on your shotgun cleaning rod and make sure it matches the threading on your cleaning accessories, such as bore brushes, jags, and patches, to ensure compatibility. If you're unsure about the thread size, you can consult the manufacturer's instructions or contact the manufacturer directly for confirmation.