Boston Gear RA-Right 90 – Spiral Bevel

Boston Right-90 Bevel Gear Drives are available with
single or double output shaft projections in three sizes with
Horsepowers ranging from .13 to 3.5.


CatalogBoston Gear RA Right 90 Spiral Bevel Catalog
Order FormBoston Gear RA Right 90 Spiral Bevel Order Form

Right-90 Series Features / How to Order



• Spiral Bevel Gear Drives are designed for high efficiency, quiet operation and long service life. Gears are made of hardened alloy steel
• Precision ground alloy steel shafts are mounted on precision ball bearings
• Housings are made of aluminum alloy, with all mounting surfaces precision machined
• All shaft projections have high quality oil seals
• Prelubricated for life

Selection Procedure

Catalog ratings are based on Class I service (uniform—no shock— 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 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.


Lubrication—Prelubricated for Ambient
Temperature Range of 50° to 125°F.

How to order

These units may be mounted in any position. When mounting by Flanges only, at least two Flanges must be secured.

TO ORDER: Specify Catalog Number and/or Item Code
EXAMPLE: RA1021 (49420)


Parts List