Click to expand Tap to zoom 40A21H-SB TYPE A PLATE SPROCKET 21 TEETH FOR #40 ROLLER CHAIN Sale $11.90 SKU 40A21H - SB Quantity One - $11.90 Price Each for 2 to 4 - $10.12 Price Each for 5 or more - $8.93 Quantity One Price Each for 2 to 4 Price Each for 5 or more title 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart 40A21H - SB (5/8)" Bore Heat Treated Type A PLATE Sprocket for #40 Roller Chain 21 Tooth Outside Diameter = 3.62" Pitch Diameter = 3.355 Free Shipping