LiftMaster MA013 Mega Arm Shear Pin — No. 6 Taper, 2-Inch Length
LiftMaster MA013 Mega Arm Shear Pin — No. 6 Taper, 2-Inch Length
The LiftMaster MA013 is the replacement shear pin for the documented Mega Arm barrier-operator mechanism. The manufacturer specifies a two-inch-long No. 6 taper pin in its shear-pin replacement instructions. This intentionally selected connection must be restored with the prescribed part after the arm and drive have been inspected. A stronger bolt, nail or improvised pin is not an upgrade: changing the connection can defeat the intended mechanical behavior and leave damage elsewhere in the barrier system unresolved.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| Mega Arm / Mega Arm Tower | Confirm MA013 and the shear-pin procedure in the applicable manual. |
| Other barrier models | Do not assume fit from arm shape or brand; verify their own parts list. |
| No. 6 taper specification | This describes the pin size and taper, not a generic No. 6 screw. |
| Arm hub and shaft | Must be inspected after impact or pin failure before a new pin is installed. |
| Ordinary bolt or solid substitute | Not an approved replacement merely because it can pass through the opening. |
Inspect the Barrier After a Shear-Pin Failure
A broken pin may follow an impact or abnormal load. Before replacing it, inspect the arm, hub, shaft and surrounding hardware for damage or displacement. Replacing only the pin can conceal a bent component or a continuing obstruction that will affect the next operating cycle. Determine what caused the failure before returning the lane to traffic.
The barrier arm must be supported and controlled during service. Do not rely on a failed connection to hold it in position, and do not assume that removing power alone prevents movement. Follow the manufacturer’s procedure for the actual operator and arm arrangement. The new pin should restore the intended connection without enlarging, welding or otherwise improvising a repair to damaged mating holes.
Specifications and Product Identification
| Specification | Details |
|---|---|
| Part number | MA013 |
| Component | Barrier-operator shear pin |
| Manufacturer size | No. 6 taper |
| Specified length | 2 inches |
| Documented platform | Mega Arm family mechanism; verify the model manual |
| Selection basis | Specified pin and undamaged mating components |
Before Ordering
- Identify the exact barrier-operator model and applicable shear-pin instructions.
- Confirm the No. 6 taper and two-inch specification.
- Inspect the arm, hub, shaft and retention arrangement after any impact.
- Plan safe lane closure, arm support and supervised operation after repair.
Package Contents and Separate Requirements
This offer identifies the MA013 shear pin. It is not a complete arm hub, shaft, barrier arm or gearbox repair kit. Confirm the supplied quantity and any retention pieces in the current offer. If the mating components have been damaged, obtain the correctly identified replacement parts separately rather than using the pin as a way to hold a damaged assembly together.
Safety Warnings — Read Before Installation or Service
- WARNING: A falling or unexpectedly moving barrier arm can cause serious injury. A qualified gate technician must secure and support the arm before shear-pin service.
- Disconnect AC and battery power as directed and prevent vehicles or pedestrians from entering the service area.
- Use the specified shear pin. Do not replace it with a stronger bolt, weld the connection solid or modify damaged mating holes as an improvised repair.
- Inspect the complete arm assembly and verify the operator’s prescribed travel and protection tests before reopening the lane.
Related Products and Important Differences
- LMRRUL monitored photo eye — a separate protection option only where the exact operator and control revision approve it; not a universal legacy retrofit.
- LMWEKITU monitored wireless edge kit — a separate edge communication system for approved controls and resistive edges; not a replacement for this mechanical or electrical service part.
Frequently Asked Questions
What does No. 6 mean here?
It is the taper-pin specification in the manufacturer instructions, not a screw-thread size.
Can I use a stronger pin so it will not break?
No. Preserve the specified shear connection rather than changing its intended behavior.
Should the arm be inspected after an impact?
Yes. A new pin does not repair a bent arm, damaged hub or shaft problem.
Is this a complete breakaway-arm kit?
No. This is a replacement shear pin for the documented mechanism, not a complete arm or breakaway conversion.
Need Help Confirming the Right Product?
Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.
Details
Need Help With Compatibility?
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For the best assistance, please provide as much information as possible, including the manufacturer, model number, part number, door or operator type, dimensions, and clear photos of the existing part or equipment.
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