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Item Details
Part#: Part#: 78C12
Item#: 100804947
Manufacturer: Martin Sprocket & Gear
Weight: 37 lbs.
Product Name: Accutorch Engineering Class Sprocket
Description: Engineering Class Sprocket; C Sprocket Style; 78 Chain Number; 12 Teeth; 10.08 in Pitch Diameter; 1.25 in Minimum Bore; 3.25 in Maximum Bore; 1 Strand
Price: $308.43
Inventory: Available
Lead Time:  Lead Time Info 1 - 2 Weeks
Order Qty:
You may also need: Engineering Chain
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Chain No.78Chain Pitch2.609 in
No. of Teeth12Hardened TeethWithout Hardened Teeth
Pitch Diameter [Min]Pitch Diameter [Max]
Pitch Diameter10.08 inBore Dia. [Min]
Bore Dia. [Max]3 7/16 inBore Dia.
Bore Range [Min]1 1/4 inBore Range [Max]3 1/4 in
Bore RangeChain StrandsSingle
Length Through Bore3 7/8 inMaterialSteel
Outside Dia. [Min]Outside Dia. [Max]
Outside Dia.10 3/4 inWidth Across Teeth 7/8 in
Hub Dia.5 1/4 inHub Length Thru3 in
Sprocket StyleCStock Bore Size1 1/4 in

Product Information
Accu-Torch® Sprockets are not intended to replace cut tooth roller chain sprockets
Accu-Torch® steel sprockets are available for many engineering class chains in style A and C. Also available as split with welded hub and split or solid detachable hub. May also be furnished as shear pin type. Contact your local Service Center.
  • Maximum bores shown will accommodate standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at an angle to keyseat.

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