Sprockets > Cast Iron Sprockets(Belt Drive Sprockets) Belt Drive Sprockets Cast Iron Sprockets Cast Iron Sprockets are used with 1" Pitch Grid Belts, 1/2" x 1" and 1" x 1" Flex Belts. They are designed for all load drive applications and offer outstanding performance in all temperatures. Each sprocket includes a 3/8" set screw. NOTE: They are also available in stainless steel. Cast Iron Sprockets with Set Screw Description Part Number 18 Tooth 1" Pitch with 1" Bore 25-1801-01 18 Tooth 1" Pitch with 1" Bore - Stainless 25-1801-91 18 Tooth 1” Pitch with 1 3/16" Bore 25-1803-01 18 Tooth 1" Pitch with 1 3/16" Bore - Stainless 25-1803-91 18 Tooth 18 Tooth 1" Pitch with 1 7/16" Bore 25-1807-01 18 Tooth 1" Pitch with 1 7/16" Bore - Stainless 25-1807-91 18 Tooth 1" Pitch with 15/16" Bore 25-1815-01 18 Tooth 1" Pitch with 15/16" Bore - Stainless 25-1815-91