Answer
Jun 09, 2025 - 06:11 AM
A #21 welding cup has an outlet diameter of 1 and 1/4 inches (31.75 mm).
This is calculated by understanding that the cup number represents the diameter in sixteenths of an inch.
A #21 is therefore 21/16 inches, which is 1 and 5/16 inches, or approximately 1 and 1/4 inches in diameter.
This is calculated by understanding that the cup number represents the diameter in sixteenths of an inch.
A #21 is therefore 21/16 inches, which is 1 and 5/16 inches, or approximately 1 and 1/4 inches in diameter.
