Guardian 4100.250 LiftMaster 41002S Mechanical Slide Gate Latch Details
The Guardian 4100.250 / LiftMaster 41002S is a heavy duty mechanical slide gate latch used for select gate, enclosure, and heavy door applications where a flush-mount latch is needed. It is zinc plated for outdoor hardware use and can be installed by bolt-on or weld-on methods when the gate frame and post layout are suitable.
This latch should be selected by part number, latch geometry, gate type, mounting surface, and field clearance. Public product wording lists this item as a slide gate latch, while product notes also reference swing gate applications, dumpster enclosures, and heavy door applications. Because of that wording mismatch, do not treat this latch as a universal slide gate operator part without confirming the existing hardware.
What This Latch Does
The 41002S provides a mechanical latching point for select gate or enclosure applications. It is intended to help hold the gate or door in the closed position when the latch is properly mounted, aligned, and secured. It is not an electric lock, magnetic lock, solenoid lock, access control strike, or gate operator control component.
- Provides a mechanical latch point for compatible gate and enclosure layouts.
- Commonly associated with Guardian 4100.250 and LiftMaster 41002S hardware references.
- Uses heavy duty steel construction for demanding gate hardware applications.
- Uses a zinc plated finish for corrosion resistance in outdoor environments.
- Can be bolted on or welded on when properly fitted to the gate and post.
- Uses a flush mount style for select heavy gate and enclosure installations.
Compatible With
The 41002S may be used with select gate, dumpster enclosure, and heavy door applications that require the Guardian 4100.250 / LiftMaster 41002S mechanical latch style. Confirm the mounting layout and latch engagement before ordering.
- Guardian 4100.250 slide gate latch reference
- LiftMaster 41002S slide gate latch reference
- Gate Openers Unlimited item reference LM-41002S
- Select flush-mount latch applications
- Select swing gate applications when the latch style and alignment match
- Select dumpster enclosure and heavy door applications
- Applications where a bolt-on or weld-on mechanical latch is required
Important Compatibility Warning
The 41002S is not automatically compatible with every sliding gate, swing gate, gate operator, enclosure, or door. The part name includes "slide gate latch," but the known product notes also reference swing gate applications. Confirm whether the customer needs a slide-action latch for a swing gate, a latch for a dumpster enclosure, or a latch for another heavy gate application.
This latch should not be ordered as a direct replacement for an electric strike, solenoid lock, maglock, pin lock, chain lock, operator limit component, or gate safety device. If the old latch was welded in place or modified in the field, match the dimensions, bolt pattern, latch throw, engagement point, and gate gap before ordering.
Comparison With Similar Parts
- 41002S / 4100.250: Mechanical slide gate latch with zinc plated finish, sold as a single latch.
- 4200.250 drop rod: Optional related drop rod reference. It should not be assumed included with the 41002S latch.
- Maglocks and solenoid locks: Electrically controlled locking devices. These are not the same as this mechanical latch.
- Gate operator locks: Operator-specific lock kits may use different wiring, mounting, and control requirements.
Similar Parts That Are Not Automatically Interchangeable
- Guardian or LiftMaster hinge hardware with similar zinc plated finish
- Gate drop rods or cane bolts
- Electric strikes for access control systems
- Magnetic locks for pedestrian or vehicle gates
- Solenoid gate locks and pin lock kits
- Slide gate guide rollers, V-track wheels, and wheel covers
- Custom welded latch assemblies with non-standard spacing
Not Intended For
- Replacing a gate operator control board, limit switch, or electrical lock
- Use as a UL 325 safety device or entrapment protection device
- Bypassing photo eyes, safety edges, monitored entrapment devices, fire access, or emergency access
- Direct replacement for an electric strike, maglock, solenoid lock, or access control relay device
- Universal replacement on all slide gates or all swing gates without measuring the existing latch
- Use as a pedestrian life-safety exit device unless the complete gate and code requirements are verified
Features and Specifications
| Specification |
Details |
| Brand / Product Family |
Guardian / LiftMaster gate hardware |
| Primary Part Number |
41002S |
| Related Guardian Reference |
4100.250 |
| Store Item Reference |
LM-41002S |
| Product Type |
Mechanical slide gate latch |
| Application Notes |
Select gate, swing gate, dumpster enclosure, and heavy door latch applications where the mounting layout matches |
| Construction |
Heavy duty steel |
| Finish |
Zinc plated finish |
| Mounting Style |
Flush mount |
| Installation Method |
Bolt-on or weld-on, depending on gate construction and site requirements |
| Lock Included |
No, lock is not included |
| Optional Related Part |
4200.250 drop rod, confirm separately if needed |
| Approximate Weight |
5.6 lb |
| Package Quantity |
Sold 1 per box, verify current package contents before ordering |
Also Known As / Related Part Numbers
- Guardian 4100.250
- LiftMaster 41002S
- LM-41002S
- 41002S slide gate latch
- Guardian slide gate latch
- LiftMaster slide gate latch
- 4100.250 slide gate latch
- 4200.250 optional drop rod - related item, not automatically included
Related Parts and Service Checks
- Check whether the existing latch is bolted, welded, or custom fabricated.
- Measure gate gap, post clearance, latch throw, and engagement point.
- Inspect the receiving side of the latch for wear, bending, or cracked welds.
- Confirm whether a padlock, keyed lock, or other lock hardware is required.
- Confirm whether the optional 4200.250 drop rod is needed for the site.
- Check gate alignment before replacing the latch; a sagging gate can make a good latch fail to engage.
- Confirm all gate operator safety devices remain installed and working after mechanical hardware service.
Technician Note
The most common mistake with this latch is ordering it because the part name says "slide gate latch" without checking the actual gate layout. The listing information points to a heavy duty mechanical latch used on select gate and enclosure applications, including swing gate style layouts. Match the old latch style, mounting surface, and engagement side before ordering.
Before Ordering Checklist
- Confirm the exact part number needed is 41002S or Guardian 4100.250.
- Confirm whether the gate uses a mechanical slide-action latch, not an electric lock.
- Confirm whether the application is swing gate, dumpster enclosure, heavy door, or another gate hardware layout.
- Confirm the latch can be mounted flush on the available surface.
- Confirm whether bolt-on mounting is possible or welding is required.
- Confirm the lock is not included and order lock hardware separately if needed.
- Confirm whether optional drop rod 4200.250 is required.
- Confirm package contents, stock status, and supplier labeling before publishing or ordering in quantity.
Installation and Service Notes
Install the latch so the gate closes smoothly and the latch engages without forcing the gate, dragging the gate, or twisting the frame. A latch should hold the gate or enclosure in the intended closed position, but it should not be used to compensate for a bent gate, leaning post, broken hinge, damaged guide hardware, or poor alignment.
If welding is required, use a qualified fabricator. Protect nearby access control wiring, gate operator wiring, batteries, safety devices, painted surfaces, and finished hardware from heat, sparks, and grinding debris. After installation, cycle the gate or door through its full travel and verify that the latch does not interfere with the gate operator, photo eyes, safety edges, emergency access, or fire access equipment.
Professional Advisory
This is mechanical gate hardware and should be installed with the full gate system in mind. If the gate is automated, do not remove, bypass, or reposition safety devices just to make the latch fit. For damaged gates, unclear weldments, access control lock conversions, pedestrian gate code concerns, or automated gate safety issues, use a qualified gate, fence, welding, or access control technician.
Product Questions & Answers
Is Guardian 4100.250 the same as LiftMaster 41002S?
Guardian 4100.250 is commonly used as the Guardian reference for the LiftMaster 41002S slide gate latch. Confirm the part label, supplier listing, and latch style before ordering if you are matching an existing installation.
Is the 41002S for slide gates or swing gates?
The public part name says "Slide Gate Latch," but the product notes also reference swing gate applications, dumpster enclosures, and heavy door applications. Treat it as a mechanical slide-action latch and confirm the actual gate layout before ordering.
Does the 41002S include a lock?
No. The 41002S listing notes that the lock is not included. If the installation requires a padlock, keyed lock, or other locking device, confirm the correct lock hardware separately.
Does this latch include the optional drop rod?
No. The optional drop rod is referenced as part number 4200.250 and should not be assumed included with the 41002S latch. Confirm package contents before ordering.
Can the Guardian 4100.250 / LiftMaster 41002S be welded on?
Yes, the product notes indicate bolt-on or weld-on installation. Welding should be handled by a qualified fabricator, and nearby operator wiring, safety devices, batteries, and finished surfaces should be protected.
Is the 41002S a replacement for an electric lock or maglock?
No. The 41002S is a mechanical latch. It is not an electric strike, magnetic lock, solenoid lock, access control relay device, or gate operator control component.
What should I check before replacing this latch?
Check the part number, gate gap, latch throw, mounting surface, receiving side, lock requirement, weld or bolt method, and gate alignment. A sagging or bent gate can prevent a new latch from engaging correctly.
Can this latch replace a gate safety device?
No. The 41002S is mechanical latch hardware only. It does not replace photo eyes, safety edges, entrapment protection, emergency access, fire access, or any required gate operator safety circuit.
