Overview
The Boston Gear GB68-B is a standard change gear engineered for industrial machinery requiring precise torque transmission and speed control. Manufactured from cast iron with a 14.5° pressure angle, this 68-tooth gear operates at 16 diametral pitch (16 DP) and features a 0.750″ bore diameter for direct shaft mounting. Boston Gear’s reputation for rigorous manufacturing ensures dimensional accuracy and consistent tooth engagement across extended service intervals.
Key Features
- 68 teeth at 16 diametral pitch (16 DP) for precise gear meshing
- Cast iron construction for strength and durability in industrial environments
- 14.5° pressure angle optimized for standard machinery
- 0.750″ bore diameter with setscrew mounting capability
- Made in U.S.A. by Boston Gear—a division of Altra Motion
- Drop-in replacement for OEM and aftermarket systems
Technical Specifications
- Material: Cast Iron
- Teeth Count: 68
- Diametral Pitch: 16 DP
- Pressure Angle: 14.5°
- Bore Diameter: 0.750″
- Pitch Diameter: 4.25″ (68 ÷ 16)
- Outside Diameter: Approx. 4.334″
- Face Width: 0.750″ (standard)
- Mounting: Setscrew hub
- Country of Origin: United States
Typical Applications
The GB68-B serves as a change gear in machine tools, textile machinery, gearbox assemblies, and industrial power transmission systems. Common uses include:
- Lathe and milling machine change gear sets
- Speed reduction and torque multiplication
- Replacement components in legacy machinery
- Custom gear train configurations in OEM equipment
Compatibility & Replacements
Compatible With
- Boston Gear standard 16 DP gear trains and meshes
- Machinery equipped with 0.75″ bore shafts
- Industrial gearbox assemblies using 14.5° PA spur gears
- Change gear applications in machine tools
Replaces / Drop-In Replacement For
The GB68-B is the direct replacement for Boston Gear model GB68 and compatible with equivalent 68-tooth, 16 DP spur gears from peer manufacturers. Verify bore diameter and mounting configuration before ordering.
Works With
- Standard 16 DP spur gear trains
- 14.5° pressure angle gear meshes
- Manual change gear assemblies in machine tools
- Custom and OEM shaft configurations with 0.750″ diameter mounting
