Boston Gear HRF721-50-B5-H-P20 50:1 single reduction worm gear speed reducer with 2.1" center distance. 700 Series cast iron housing with 56C quill flange input and hollow bore output. Output bore diameter is 1.25" (P20). Suitable for general industrial power transmission applications requiring a compact right-angle drive.

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"