Liftmaster K19-50038, LIMIT CHAIN, #50, Q140
The LiftMaster K19-50038 is a #50 chain commonly identified by the Elite/LiftMaster Q140 reference. It is used in the limit chain assembly on compatible CSW24 swing gate operators. This chain helps link mechanical movement to the limit system so the operator knows where the gate should stop. If the chain stretches, rusts, breaks, or loses proper tension, the gate may stop short, overtravel, or become difficult to set at the correct open and close positions. Because CSW24, CSW24V, CSW24VH, CSW24U, and CSW24UL generations can vary, this part should be verified by the parts diagram before ordering.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Limit chain |
| Part Number | K19-50038 |
| Also Known As | Q140 |
| Chain Size | Number 50 |
| Application | Limit chain for select swing gate operators |
| Compatible Operator Type | CSW24V, CSW24VDC, CSW24UL and related CSW24 families |
| Notes | Verify operator generation and limit assembly diagram |
Compatible With
This part may be used with the following operators or product families when the original part number and parts diagram match:
- LiftMaster CSW24V swing gate operators
- LiftMaster CSW24VDC swing gate operators
- LiftMaster CSW24UL swing gate operators
- LiftMaster CSW24U and CSW24VH model families when Q140 / K19-50038 is listed in the parts diagram
- Select LiftMaster / Elite swing gate limit assemblies using #50 Q140 chain
Also Known As / Related Part Numbers
- K19-50038
- Q140
- 19-50038
- 1950038
- LiftMaster #50 limit chain
- CSW24 limit chain
- Elite Q140 chain
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 is the Q140 reference?
Q140 is a common related number for the LiftMaster K19-50038 #50 limit chain.
What models commonly use K19-50038?
It is commonly associated with CSW24V, CSW24VDC, CSW24UL, and related CSW24 swing gate operators when shown in the parts diagram.
Is this a universal #50 chain?
No. It should be used only where the operator calls for the K19-50038 or Q140 limit chain.
What happens when this limit chain is worn?
The gate may lose accurate open or close positions, overtravel, or require repeated limit adjustment.
Should limits be reset after replacement?
Yes. The limit system should be inspected and adjusted after replacing the chain.
