LiftMaster K13-50140 Limit Nut Q082 for HCT Operators
The LiftMaster K13-50140 is a replacement limit nut used in the limit system of HCT Hercules overhead gate operators. This part, also known as Elite Q082, travels along the limit shaft and works with the limit switch arrangement to establish the operator travel endpoints. When the limit nut is worn, damaged, or does not move properly, the operator may not stop where expected, may lose adjustment, or may be difficult to set during service. Unlike an electrical limit switch, the limit nut is a mechanical part, but it directly affects how the switch is actuated. This makes correct fitment important. The part should be matched to the HCT/Hercules parts breakdown and inspected with the related limit shaft, chain, and switch hardware to avoid replacing only one part in a worn limit assembly.
Compatible With
- LiftMaster HCT overhead gate operators that list K13-50140 in the parts diagram
- Elite Hercules overhead operator applications using Q082 limit nut reference
- LiftMaster HCT perimeter access systems where the limit nut is part of the travel limit assembly
- Possible HCTDC or later HCT family references only when the parts diagram confirms K13-50140 or Q082
- Not a universal limit nut for all LiftMaster commercial door or gate operators
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Limit nut |
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| Part Number | K13-50140 |
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| Related Numbers | Q082 |
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| Application | Travel limit adjustment mechanism |
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| Compatible Operator Type | LiftMaster HCT / Elite Hercules overhead gate operators |
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| Notes | Inspect related limit shaft and switch hardware during service |
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Also Known As / Related Part Numbers
- K13-50140
- Q082
- Elite Q082
- LM-K13-50140
- LiftMaster K1350140
- LiftMaster 1350140
Technician Note
This part should be matched by the operator model, original part number, and replacement parts diagram. Similar LiftMaster parts can look close but differ by switch rating, actuator style, chain length, bracket geometry, mounting pattern, or operator generation.
Before Ordering
- Confirm the manufacturer part number on the old part or parts diagram.
- Match the operator model and production series, not just the product family name.
- Compare physical mounting points, terminals, actuator style, chain length, or bracket layout where applicable.
- Check nearby worn parts that may have caused the original failure.
- For electrical switch replacement or unsafe gate movement, use a qualified gate or commercial door technician.
Professional Advisory
Gate and commercial door operators are heavy moving systems. Do not bypass monitored safety devices, limit controls, stop circuits, or required entrapment protection to keep an operator running. If the operator has high-voltage wiring issues, damaged controls, missing safety devices, or unpredictable movement, have the system inspected before returning it to service.
Product Questions and Answers
What does the K13-50140 limit nut do?
It moves along the limit shaft and helps actuate the limit switches so the HCT operator stops at the correct open and close positions.
Is K13-50140 the same as Elite Q082?
Q082 is commonly listed as the Elite reference for this LiftMaster limit nut.
What symptoms can indicate a worn limit nut?
Travel limits that will not stay set, inconsistent stopping, stripped threads, cracked plastic, or visible wear on the limit hardware can point to a limit nut problem.
Does this fit all Hercules operators?
It is associated with HCT / Hercules overhead operators, but the exact operator generation and parts diagram should be checked.
Should other limit parts be inspected?
Yes. The limit shaft, switches, chain, and related hardware should be checked so a worn companion part does not damage the new nut.
