ANSI (American National Standards Institute) and BS (British Standard) chains are roller chains for power transmission, with ANSI measuring pitch in 1/8" increments (e.g., '40' for 4/8" or 1/2") and BS measuring in 1/16" increments (e.g., '08B' for 8/16" or 1/2"), using ISO 606 standards; while similar, they are dimensionally different and generally not interchangeable with standard sprockets, with ANSI emphasizing solid bushings for better wear and BS following European norms, both offering single/multi-strand, heavy-duty (H), and attachment variations.
ANSI Standard Chains
Numbering: First digit(s) indicate pitch in eighths of an inch (e.g., '3' = 3/8", '4' = 4/8" or 1/2").
Construction: Often feature solid bushings and rollers for full contact, better lubrication, and longer wear life, with heat-treated components for strength.
Series: Available in standard and heavy (H) series (thicker plates, hardened pins - V) for increased strength.
Applications: Common in general power transmission, short conveyors, and quiet operations.