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55-Series Sprockets


55 series engineer class sprocket are used for a wide verity of chain sizes. These sizes include CA550, CA550HD, CA555, CA557, CA565, 55, C55, SS55, C55A Rooftop, C55B Rooftop, C55D Rooftop, and C55L. These sprockets are typically supplied as cast material but we can also supply them as steel for longer operation. The below chart shows the standard tooth counts as well as dimensions for each size. To get a quote on the sprocket or chain please contact us or fill out the below request form and we will be happy to assist you.
55-Series Sprockets
Sprocket Size Tooth Count Style Pitch Diameter Hub Diameter Length Thru Bore Maximum Bore Weight
55C5 5 C 2.77" 2.00" 2.00" 0.94" 2.0 LBS
55C6 6 C 3.26" 2.00" 2.00" 0.94" 2.0 LBS
55B7 7 B 3.76" 2.50" 2.00" 1.63" 3.0 LBS
55B8 8 B 4.26" 2.50" 2.00" 1.63" 4.0 LBS
55C9 9 C 4.76" 3.00" 2.00" 1.94" 5.0 LBS
55C10 10 C 5.26" 3.50" 2.00" 2.19" 5.0 LBS
55C11 11 C 5.77" 4.50" 3.00" 2.88" 6.0 LBS
55C12 12 C 6.30" 4.50" 3.00" 2.88" 10.0 LBS
55C13 13 C 6.80" 4.50" 3.00" 2.88" 10.0 LBS
55C14 14 C 7.31" 4.50" 3.00" 2.88" 12.0 LBS
55C15 15 C 7.83" 4.50" 3.00" 2.88" 13.0 LBS
55C16 16 C 8.34" 4.50" 3.00" 2.88" 13.0 LBS
55C17 17 C 8.85" 4.50" 3.00" 2.88" 17.0 LBS
55C18 18 C 9.39" 4.50" 3.00" 2.88" 20.0 LBS
55C19 19 C 9.92" 4.50" 3.00" 2.88" 20.0 LBS
55C20 20 C 10.43" 6.00" 3.50" 2.88" 20.0 LBS
55C21 21 C 10.94" 6.00" 3.50" 4.00" 23.0 LBS
55C22 22 C 11.43" 6.00" 3.50" 4.00" 24.0 LBS
55C23 23 C 11.97" 6.00" 3.50" 4.00" 29.0 LBS
55C24 24 C 12.47" 6.00" 3.50" 4.00" 32.0 LBS
55C25 25 C 13.00" 8.00" 4.00" 6.00" 31.0 LBS
55C27 27 C 14.07" 8.00" 4.00" 6.00" 38.0 LBS
55C28 28 C 14.54" 8.00" 4.00" 6.00" 42.0 LBS
55C29 29 C 15.08" 8.00" 4.00" 6.00" 26.0 LBS
55C30 30 C 15.59" 8.00" 4.00" 6.00" 54.0 LBS
55C31 31 C 16.11" 8.00" 4.00" 6.00" 58.0 LBS
55C32 32 C 16.63" 8.00" 4.00" 6.00" 63.0 LBS
55C34 34 C 17.67" 8.00" 4.00" 6.00" 31.0 LBS
55C35 35 C 18.20" 8.00" 4.00" 6.00" 69.0 LBS
55C36 36 C 18.70" 8.00" 4.00" 6.00" 77.0 LBS
55C38 38 C 19.75" 8.00" 4.00" 6.00" 35.0 LBS
55C40 40 C 20.79" 10.00" 4.00" 8.00" 37.0 LBS
55C41 41 C 21.31" 10.00" 4.00" 8.00" 36.0 LBS
55C48 48 C 24.94" 10.00" 4.00" 8.00" 45.0 LBS
55C50 50 C 25.98" 10.00" 4.00" 8.00" 47.0 LBS
55C54 54 C 28.00" 10.00" 4.00" 8.00" 50.0 LBS

Weld On Hub 55-Series Sprockets
Sprocket Size Tooth Count Bore Root Diameter Outside Diameter Hub Type Needed Width (B) Weight
55W6 6 1-5/8" 2.62" 3-3/4" W 9/16" 0.88 LBS
55X7 7 2" 3.11" 4-1/4" X 9/16" 1.00 LBS
55X8 8 2" 3.61" 4-3/4" X 9/16" 1.44 LBS
55X9 9 2" 4.12" 5-1/4" X 9/16" 2.06 LBS
55X10 10 2" 4.63" 5-3/4" X 9/16" 2.50 LBS
55X11 11 2" 5.14" 6-1/4" X 9/16" 3.32 LBS
55X12 12 2" 5.65" 6-3/4" X 9/16" 4.00 LBS
55X13 13 2" 6.16" 7-1/4" X 9/16" 5.00 LBS
55X14 14 2" 6.67" 7-3/4" X 9/16" 5.92 LBS
55X15 15 2" 7.19" 8-1/4" X 9/16" 6.77 LBS



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Requesting 55-Series Sprockets

To get a quote on 55-Series Sprocket simply fill out the request for quote from and someone from our customer service team will contact you. Please note that if you don't see the sprocket size you need above send us an email or give us a call.


Company Name:
Contact Name:
Email Address:
Phone Number:
Sprocket Size:
Chain Size:
Tooth Count:
Hub Type (A-plate, B-Hub, C-Hub, other):
Length Thru Bore:
Bore Size/ Type (plain, finished w/ key-way & set screws, or other):
Preferred Material (steel, cast, or other):
Quantity Needed:

Additional Information or Notes:


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