Product Overview
The LiftMaster K13-10024 limit nut is a small but important part used in select LiftMaster commercial door operators. It rides on the threaded limit shaft and helps trip the limit switches that tell the operator where to stop in the open and close directions. When the nut is worn, cracked, stripped, or missing, the operator may not stop at the correct point or may be difficult to adjust.
Limit nuts are common wear parts in commercial operators because they move every cycle. Over time, the threads can wear or the nut can lose its ability to stay positioned accurately on the limit shaft. Replacing the nut can restore accurate limit adjustment when the rest of the limit assembly is in good condition.
This part is widely associated with LiftMaster commercial door operator lines and related service numbers. It should still be confirmed by the model parts breakdown because some operators use different limit nut styles, limit shafts, or switch arrangements.
Compatible With
- Select LiftMaster commercial door operators using K13-10024 limit nut
- Commonly associated with many J, H, T, GT, GH, and related commercial operator limit shaft assemblies when listed in the parts diagram
- Select LGO and MGJ commercial operator references where this part is listed
- Select commercial gate or door service references listing 13-10024 or related numbers
- Verify by original nut, threaded limit shaft, and operator parts diagram
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Limit nut |
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| Part Number | K13-10024 |
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| Application | Commercial operator limit shaft / limit switch adjustment |
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| Compatible Operator Type | Select commercial door operators |
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| Function | Trips limit switches for open and close stopping points |
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| Notes | Limits must be reset and tested after replacement |
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Also Known As / Related Part Numbers
- K13-10024
- 13-10024
- 113-00078
- AB113-00078
- G31173
- MG3101113
- 31173
- 310.1113
- AGS920
- 1310024
- 31-173
- 450587
- 133A182
- LM-K13-10024
Technician Note
If the limit nuts are worn, inspect the threaded limit shaft and limit switches at the same time. A damaged shaft or loose switch bracket can prevent accurate limit setting even with new nuts installed.
Before Ordering
- Confirm the operator uses this style of limit nut
- Match one of the related part numbers in the parts diagram
- Inspect the limit shaft threads and limit switch arms
- Plan to reset open and close limits after installation
- Test the operator through full travel after service
Professional Advisory
Limit adjustment affects safe stopping positions. Commercial door operator limit service should be performed by a qualified technician, especially on high-cycle doors or heavy overhead doors.
Important Ordering Warning
A worn limit nut can allow door overtravel. Do not continue running an operator that is driving past its intended open or close limits.
Product Q&A
What does the K13-10024 limit nut do?
It moves along the threaded limit shaft and actuates the operator limit switches so the door stops at the correct open and close positions.
What symptoms suggest a worn limit nut?
The operator may overtravel, stop inconsistently, lose its limit setting, or be difficult to adjust.
Which operator models use this limit nut?
It is used in select LiftMaster commercial door operators, commonly including several J, H, T, GT, GH, LGO, and MGJ style references when listed in the parts diagram.
Are the related numbers exact replacements?
Many related numbers are commonly associated with this limit nut, but the parts diagram should be used to confirm the correct service part.
Do limits need to be reset after replacement?
Yes. Open and close limits must be reset and tested after replacing limit nuts.
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