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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: Accutorch Engineering Class Sprocket; Sprocket Style C; 78 Chain No.; 12 Teeth; 10.08 in Pitch Dia; 1 Strand; Reboreable; Bore Dia. 1.25 in to 3.25 in
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]10.08 inPitch 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 RangeBore Style
Chain StrandsSingleLength Through Bore3 7/8 in
MaterialSteelOutside Dia. [Min]10 3/4 in
Outside Dia. [Max]Outside Dia.10 3/4 in
Width Across Teeth 7/8 inHub Dia.5 1/4 in
Hub Length Thru3 inSprocket StyleC
Stock 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.
  • For engineering class and mill chains |Manufactured of high carbon steel |Precise machining and processes ensure consistent finish and high quality
  • Specifications
  • 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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