Boston Gear SF721-20-B7-G 20:1 single reduction worm gear speed reducer with 2.1" center distance. 700 Series cast iron housing with quill flange input and screw conveyor adapter for 140TC NEMA C-face motor. Left-side solid output shaft with 1" diameter. Designed for general industrial power transmission applications.

Product Features

• The 700 Series' large oil reservoir provides efficient heat dissipation and lubrication for longer operating life.
• Its multi-position mounting flexibility allows for installation in virtually any position.
• Housings are straddle-milled, top and bottom, for precise alignment of horizontal and vertical bases.
• Internal baffles assure positive, leak-free venting.
• The 700 Series' rugged housing, fabricated of fine-grained, gear-quality cast iron, provides maximum strength for maximum durability, as well as greater precision during worm and gear alignment.
• Boston Gear's 700 Series high-strength bronze worm gear is straddle mounted between heavy-duty tapered roller bearings to increase thrust and overhung load capacities, sizes 713-760.
• 700 Series' high-strength steel output shaft assures capacity for high torque and overhung loads.
• Pipe plugs allow easy fill, level, and drain in any mounting position.
• The 700 Series' super-finished oil-seal diameters on both input and output shafts extend seal life.

Specifications

• 11 basic single reduction sizes
• 8 basic double reduction sizes
• 1/6 - 25 HP
• 5:1 - 100:1 ratios single reduction
• 100:1 - 3600:1 ratios double reduction
• Non-flanged, NEMA C-face quill, and coupled input styles
• Projecting and hollow output shafts
• Projecting diameters from 1/2" to 2-1/4"
• Hollow output bore diameters from 5/8" to 3-7/16" (with over 20 bore sizes in stock)