Liftmaster K19-40001M, MASTER LINK, #40, NP
The LiftMaster K19-40001M is a nickel-plated #40 master link for compatible chain assemblies. It connects the ends of a #40 roller chain and allows the chain to be opened for service or reconnected after replacement. Although master links are simple hardware, using the wrong size or a worn clip can cause chain separation, sudden loss of drive, and damage to sprockets or surrounding parts. This part is best used with #40 LiftMaster chain systems where the parts diagram or service repair requires a #40 connecting link. Inspect the chain, sprockets, and link clip during service.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Master connecting link |
| Part Number | K19-40001M |
| Chain Size | Number 40 |
| Finish | Nickel plated |
| Application | Connecting link for compatible #40 chain assemblies |
| Compatible Operator Type | Select LiftMaster commercial gate and door operators |
| Notes | Do not mix with other chain sizes |
Compatible With
This part may be used with the following operators or product families when the original part number and parts diagram match:
- LiftMaster commercial gate operators using #40 roller chain
- Select LiftMaster commercial door operators using #40 chain and a compatible master link
- LiftMaster chain assemblies where K19-40001M, 19-4001M, or related #40 master link references are called out
- Not compatible with #35, #48, #50, or other chain sizes
Also Known As / Related Part Numbers
- K19-40001M
- 19-40001M
- 19-4001M
- K19-40ML
- 19-40ML-NP
- 19-5040-NP
- G195040NP
- LiftMaster #40 master link
- Nickel-plated #40 master link
Technician Note
Chain, spring, and limit-system parts should be matched by the original part number and by the operator parts diagram. Similar-looking parts can vary by chain size, pitch count, spring dimension, operator generation, finish, and whether a master link is included.
Before Ordering Checklist
- Confirm the manufacturer part number on the old part or parts diagram
- Verify the operator model and generation
- Compare chain size, pitch count, finish, spring size, or kit contents as applicable
- Inspect related sprockets, bearings, clips, brackets, and limit hardware for wear
- Do not substitute a different chain size, spring, or master link without confirming the parts diagram
Professional Advisory
Gate operators, barrier systems, and traffic control equipment include moving mechanical parts that can create pinch, crush, or stored-tension hazards. Disconnect power where required and use a qualified gate technician when servicing drive chains, limit systems, torsion springs, or traffic spike hardware.
Product Questions & Answers
What chain size does K19-40001M fit?
It fits compatible #40 chain assemblies.
Is this master link nickel plated?
Yes. K19-40001M is listed as a #40 nickel-plated master link.
Can it be used on #50 chain?
No. #40 and #50 chain use different master link sizes and are not interchangeable.
When should a master link be replaced?
Replace it if the clip is missing, the link is bent, the side plate is worn, or the chain was removed during service.
What related part numbers may refer to this item?
Related references include 19-4001M, 19-40ML-NP, 19-5040-NP, G195040NP, and K19-40ML.
