Click to expand Tap to zoom 50A21H-SB Type A Plate Sprocket for #50 Roller Chain - 21 Tooth - 3/4" Stock Bore Sale $21.40 SKU 50A21H-SB Quantity One - $21.40 Price Each on 2 to 4 - $19.26 Price Each on 5 or More - $17.12 Quantity Discounts Quantity One Price Each on 2 to 4 Price Each on 5 or More 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. 50A21H - SB (3/4") Bore Heat Treated Type A PLATE Sprocket for #50 Roller Chain 21 Tooth Outside Diameter = 4.520" Pitch Diameter = 4.194 Free shipping in the USA!