120-1HR Offset Link Precision ANSI Roller Chain - Heavy - 1 1/2" Pitch - Offset Link - Precision ANSI Roller Chain - Heavy - 1 1/2" Pitch - Offset Link - Common Interchanges 120-1H OSL RS120H OSL UST 120 Heavy Offset Link 120-1 Heavy Offset Link Interchange information is provided as a guide only.