When sourcing a horizontal accumulator, you must prioritize strip width and thickness capacity to ensure compatibility with your existing mill. Key metrics include the maximum accumulation length, which determines how much time you have for welding coils without stopping the line, and the inner/outer diameter of the coils. Look for units featuring hardened steel rollers and adjustable side guides to prevent strip edge damage. Additionally, ensure the motor power and drive system (AC or DC) are sufficient to handle the tension requirements of your specific material, whether it be carbon steel, stainless steel, or aluminum.