12B roller chain is a metric 3/4-inch pitch British Standard (ISO/DIN 8187) power transmission chain..

12B-1 (12B1) SIMPLEX CHAIN SPECIFICATIONS:

Pitch (P): 3/4" (19.05 mm)Width Between Inner Plates (b₁): 0.460" (11.68 mm)Roller Diameter (d₁): 0.475" (12.07 mm)Pin Diameter (d₂): 0.225" (5.72 mm)Link Plate Height (h₂): 0.637" (16.00 mm)Plate Thickness (T): 0.070" (1.80 mm)Overall Width (L): 0.885" (22.50–22.70 mm)

Chain prices are based on per meter