The pulleys are .40” inside the flanges to allow for belts up to 3/8” in width. Two set screws using 1.5mm hex key.
#25 Roller Chain, 10 feet Product Overview:
S25-16HA-313K, 7075 Aluminum Sprocket, 25 Series, 16 tooth, 313 Key Bore Fits the 8mm shaft of a 2.5 in. CIM Motor, with a 2mm keyway.
Used with Maverick DC Motor with 6mm shaft and all 6mm D-Shaft Axels. Matching belt 10mm Timing Belt, # 76233.
Specifications:
Includes two 5mm Bore, 10 Tooth Aluminum Pulleys and one 1M XL Timing belt
The XL series belt is compatible with the 6mm, 10 tooth XL pulley.
3/8” wide, 1/5 pitch XL series belti. Constructed of Neoprene with Fiberglass cords for superior strength and wear resistance. Compatible XL series pinion pulley.