Overview
The Martin BK67-1-1/8 is a fractional horsepower (FHP) sheave engineered for reliable, smooth power transmission in light-duty V-belt applications. With a finished 1-1/8″ bore and 6.45″ outside diameter, this single-groove sheave accommodates 4L, 5L, A, or B belt sizes. Cast iron construction and static balancing ensure durability and reduced vibration in typical industrial and commercial machinery.
Key Features
- Single groove sheave with 6.45″ OD and 1-1/8″ finished bore
- Manufactured from class 30 gray iron with 30,000 PSI tensile strength
- All Martin sheaves are statically balanced for smooth operation
- FHP sheaves are light-duty units designed for fractional horsepower applications
- Compatible with 4L, 5L, A, and B V-belt profiles
- Precision-machined groove for optimal belt contact and engagement
Technical Specifications
- Series: BK67
- Bore Diameter: 1-1/8″
- Outside Diameter (OD): 6.45″
- Number of Grooves: 1
- Belt Type Compatibility: 4L, 5L, A, B
- Material: Class 30 gray cast iron
- Bore Type: Finished bore (ready to mount)
- Balancing: Static balance per ISO 1940
- Maximum Speed: 6500 FPM
Typical Applications
Martin BK67-1-1/8 sheaves are used in:
- Small electric motor drives
- Fractional horsepower equipment (fans, pumps, compressors)
- HVAC and refrigeration systems
- Industrial machinery and conveyor systems
- Agricultural equipment
- Material handling and hoisting applications
Compatibility & Replacements
Compatible With
- Electric motors with 1-1/8″ shafts
- Gearboxes and speed reducers with 1-1/8″ input/output shafts
- Industrial machinery requiring light-duty belt drive systems
- Standard V-belt drive systems rated for 4L, 5L, A, or B belts
Replaces / Drop-In Replacement For
- Gates BK67-1-1/8 sheave
- Dodge MB65-1-1/8 sheave (verify compatibility with your system integrator)
- Continental BK67-1-1/8 finished bore sheave
Works With
- Standard V-belt drive systems (4L, 5L, A, B profiles)
- Fractional horsepower motor applications up to 6500 FPM
- Shaft-mounted and motor-mounted configurations
- Standard mechanical power transmission assemblies
