LiftMaster K99-11341-ES Hook-End Extension Spring
The K99-11341-ES is a hook-on-both-ends extension spring for mechanical traffic-control service. It is intended for use where the original LiftMaster parts diagram identifies this spring as part of the traffic spike or lane-control assembly.
Extension springs store energy as they stretch and help return moving components after the system is triggered. In a traffic spike or directional control application, the correct spring helps the teeth or mechanical section return to the proper operating position without dragging, binding, or staying partially raised.
Do not substitute by overall length alone. Wire diameter, hook style, installed stretch, and spring rate all affect function. If an old spring has failed, also inspect the pivot points, top plates, tooth sections, and fasteners for binding or impact damage.
Compatible With
- Select LiftMaster traffic spike and access-lane mechanical assemblies that call for K99-11341-ES
- Commonly associated with Stingray / traffic spike service part searches where the original parts diagram lists this hook-end extension spring
- May be used with related directional traffic-control assemblies only when the original spring number matches
- Not a garage door extension spring and not a substitute for Cobra / King Cobra spring kits unless the parts diagram confirms it
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Extension spring |
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| Part Number | K99-11341-ES |
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| End Style | Hook on both ends |
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| Application | Traffic-control / spike-system mechanical return service |
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| Material | Spring steel, manufacturer supplied |
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| Compatible Operator Type | Traffic spike / vehicle access-control system |
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| Notes | Match spring part number, length, hook style, and installation position |
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Also Known As / Related Part Numbers
- K99-11341-ES
- 99-11341-ES
- 11341-ES
- Hook-end extension spring
- Related traffic spike spring family references: K177-0237, K99 traffic spike service parts
Technician Note
If one spring failed from fatigue or corrosion, check the opposite side and related moving hardware. A new spring will not solve a binding tooth section, bent plate, or seized pivot.
Before Ordering Checklist
- Match the original spring part number and hook style
- Confirm the traffic spike or lane-control model before ordering
- Inspect pivots, teeth, top plate, and mounting hardware for binding
- Secure the lane so vehicles cannot enter during service
- Replace missing or damaged safety/warning signage where required
Professional Advisory
This is a traffic-control mechanical service part. Traffic spike sections, springs, teeth, and plates can create pinch, trip, and tire-damage hazards if serviced incorrectly. Block traffic, secure the lane, and use qualified personnel for replacement and adjustment.
Product Questions and Answers
Is K99-11341-ES a garage door extension spring?
No. It is listed as a LiftMaster service spring for traffic-control style mechanical applications, not a garage door counterbalance spring.
Why does hook style matter?
The hook ends determine how the spring attaches to the mechanism. A different end style may not seat correctly or may change the way the mechanism returns.
Can I match this spring by size only?
No. Spring rate, hook design, length, and mounting position matter. Use the original part number or parts diagram.
What should be inspected when replacing it?
Inspect tooth sections, plates, pivots, anchors, and hardware for wear, rust, bending, or impact damage.
Is this spring under tension?
Yes. Extension springs can store energy. The lane should be secured and the mechanism serviced carefully by qualified personnel.
