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Item Details
Part#: Part#: 78C12
Item#: 100804947
Manufacturer: Martin Sprocket & Gear
Weight: 37 lbs.
Product Name: Accutorch Sprocket
Description: Sprocket for #78 Chain; 10.96" Outside Diameter; 12 Teeth; w/a Min Bore of 1.25" & a Max Bore of 3 7/16"
Price: $294.66
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.
Chain StrandsSingleLength Through Bore3 7/8 in
MaterialSteelOutside Dia. [Min]
Outside Dia. [Max]Outside Dia.10.96 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.
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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