LiftMaster K15-50B60VMP 50B60T Sprocket, 1-3/4 in Bore
The LiftMaster K15-50B60VMP is a heavy commercial door operator sprocket commonly described as a 50B60T sprocket with a 1-3/4 inch bore and 2-1/2 inch x 13 inch dimensional reference. It is used in select LiftMaster commercial operator drive systems where a large #50 chain sprocket is required.
This sprocket is a dimensional replacement part. The correct fit depends on chain pitch, tooth count, bore, hub style, shaft size, keying, and the operator parts diagram. Even small differences in bore or hub dimensions can make a sprocket unusable or cause chain misalignment.
Use K15-50B60VMP or 15-50B60VMP where the LiftMaster commercial door operator breakdown identifies this sprocket. It is not a universal sprocket for every #50 chain application.
Compatible With / Common Applications
Commonly used in the following applications when the parts diagram and dimensions match:
- Select LiftMaster commercial door operators requiring K15-50B60VMP or 15-50B60VMP
- ANSI #50 chain drive applications requiring a 50B60T sprocket
- Commercial operator drive or output positions requiring a 1-3/4 inch bore and the listed 50B60T dimensional configuration
- Large commercial door operator mechanical drive systems where the removed sprocket matches the same tooth count, bore, hub, and keying
- Not a substitute for 15-50B18TKK, 15-50B35, 15-50B60ZPZ, or other 50B sprockets with different dimensions
- Not for residential garage door openers or smaller #40/#41 chain drive systems
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Commercial operator sprocket |
| Part Number | K15-50B60VMP |
| Alternate Listing Number | 15-50B60VMP |
| Sprocket Type | 50B60T |
| Chain Size | ANSI #50 roller chain |
| Tooth Count | 60 teeth |
| Bore | 1-3/4 in |
| Dimensional Reference | 2-1/2 in x 13 in as commonly listed |
| Application | Commercial door operator sprocket applications by parts diagram |
| Notes | Verify bore, chain size, hub, keyway, tooth count, and operator diagram |
Also Known As / Related Part Numbers
- K15-50B60VMP
- 15-50B60VMP
- LM-K15-50B60VMP
- LM-15-50B60VMP
- LIF-K15-50B60VMP
- LIF-15-50B60VMP
- OCGSLM-15-50B60VMP
- 50B60T
- 50B60VMP
- LiftMaster 50B60T sprocket
- Related sprocket family: 15-50B18TKK, not interchangeable
Technician Note
Large sprockets usually fail from chain misalignment, worn keys, shaft movement, or stretched chain. Inspect the full drive path before installing this part so the new sprocket is not immediately damaged.
Before Ordering
- Confirm the diagram lists K15-50B60VMP or 15-50B60VMP.
- Verify the chain size is ANSI #50.
- Confirm the sprocket is 50B60T with 60 teeth.
- Measure the bore and compare the hub/keyway configuration to the original part.
- Check chain tension, bearing condition, shaft wear, and mating sprockets before installation.
Professional Advisory
This sprocket is used in heavy commercial operator drive systems. Secure the door and drive assembly, follow lockout procedures, and use qualified service personnel when working around chain, sprockets, and rotating shafts.
Product Questions & Answers
Is K15-50B60VMP the same as 15-50B60VMP?
They are commonly used as related listing numbers for the same 50B60T sprocket family, but the operator diagram should still be checked.
What chain size does this sprocket use?
This sprocket is in the 50B family, so it is used with ANSI #50 roller chain applications.
Can I use another 50B60 sprocket?
Only if the bore, hub, keyway, tooth count, and operator parts diagram match. 50B60 sprockets are not automatically interchangeable.
Why is the bore important?
The bore must fit the operator shaft correctly. A loose or wrong bore can damage the shaft, keyway, chain alignment, and drive components.
Should the chain be replaced with the sprocket?
If the chain is stretched, rusted, kinked, or worn into the old sprocket teeth, replacing the chain at the same time may be the better repair path.
