Boston Gear R/VR100, 200 – Spiral Bevel

Boston “R” and “VR” 100 and 200 Series Spiral Bevel Gear Boxes are available in four sizes with horsepowers ranging from 2.19 to 50.92.


CatalogBoston Gear R VR100 200 Spiral Bevel Catalog
Order FormBoston Gear R VR100 200 Spiral Bevel Order Form

R100/R200 Series & VR100/VR200 Series Spiral Bevel Gear Drives 


• Spiral Bevel Gear Drives are designed for high efficiency, quiet operation and  long service life. Gears are made of case-hardened alloy steel
• Shafts are heat treated, alloy steel mounted on heavy duty, tapered roller bearings
• Housings are made of cast iron, precision machined to assure accurate,  permanent alignment of the gears

Selection Procedure

Catalog ratings are based on Class I service (uniform load, operating no more than 10 hours/day). For applications meeting these conditions selection may be made by comparing the actual load to be transmitted with the appropriate catalog rating. For other conditions selection must be made, based on an equivalent horsepower or torque, obtained by multiplying actual load by the
proper service factor.

Selection Procedure:
1. Determine the correct service factor using the Applications Classification Chart—Pages 348 & 349. If the application is not listed, obtain service factor from Service Factor Chart, Page 349.
2. Multiply the actual output horsepower or torque by the service factor to obtain the equivalent rating required.
3. Establish input and output speed and/or gear ratio required for the enclosed drive.
4. Selection of all bevel gear drives should be based on Steps 1 through 3 using Selection Chart for desired input and output speeds (including speed increasing drives) that satisfy the required equivalent horsepower or torque.

How to Order

Lubrication & Gear Reducers



Selection Charts

Parts List