Mighty Mule HB100 Hardware Bracket Set for FM500, FM502, FM350, FM352 and MM Series Operators
The HB100 is the replacement hardware bracket set used to mount compatible Mighty Mule swing gate opener arms to the gate and post structure. These brackets establish the pivot geometry for the actuator. When brackets are bent, missing, installed in the wrong position, or replaced with mismatched hardware, the opener can run out of travel, bind at the end of the stroke, or place extra stress on the arm and gate hinges. Customers typically order HB100 when moving an opener to a new gate, replacing damaged installation hardware, or correcting a worn mount that no longer holds the arm securely.
HB100 should not be treated as the same item as H101P. H101P is the small hardware bag; HB100 is the bracket set. Each opener arm generally needs the correct bracket set, and dual-gate installations may require bracket hardware for each arm depending on what is missing or damaged.
Compatible With
HB100 is commonly associated with these Mighty Mule opener models and related applications when the bracket geometry matches:
- Mighty Mule MM271 and MM272
- Mighty Mule MM371W and MM372W
- Mighty Mule MM571W and MM572W
- Mighty Mule FM350 and FM352
- Mighty Mule FM500 and FM502
- Mighty Mule FM600 references where HB100 is listed for the operator family
- Select older Mighty Mule and GTO residential swing gate installations using the same bracket geometry
- Not a substitute for 347IH push-to-open bracket hardware when that special geometry is required
Features & Specifications
| Manufacturer | Mighty Mule / Linear / GTO |
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| Product Type | Hardware bracket set |
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| Part Number | HB100 |
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| Application | Mounting bracket set for compatible swing gate opener arms |
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| Compatible Operator Type | Select residential swing gate openers |
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| Included Components | Bracket hardware set; contents may vary by supply source |
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| Material / Finish | Metal bracket components |
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| Notes | Each compatible opener arm generally requires one bracket set |
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Also Known As / Related Part Numbers
Common related numbers and references include:
- HB100
- HB-100
- SR-HB100
- OEM Hardware Brackets Box SR-HB100
- Mighty Mule HB100
- Linear HB100
- GTO HB100
- Hardware Brackets Box
- Hardware Bracket Set
- FM500 bracket set
- FM502 bracket set
- FM350 bracket set
- Not the same as H101P hardware bag
Technician Note
Use HB100 when the physical brackets are the problem. Use H101P when the brackets are still correct and only the small hardware is missing or corroded.
Before Ordering
- Confirm the operator model and arm style.
- Check whether the installation is pull-to-open or push-to-open.
- Inspect post material and gate bracket mounting surface before reusing old holes.
- Make sure the arm is not bent or overextended from a prior bracket failure.
- For dual gates, confirm whether one or both arms need bracket hardware.
Important Ordering Warnings
Bracket geometry controls how the actuator loads the gate. Do not install generic or mismatched brackets in place of HB100 where the manufacturer bracket set is required.
Professional Advisory
Gate opener service can involve stored gate force, moving arms, batteries, and low-voltage control wiring. If the operator is moving unexpectedly, has damaged wiring, or has missing required safety devices, have the system inspected by a qualified gate technician before returning it to service.
Product-Specific Q&A
Is HB100 a complete replacement arm?
No. HB100 is a bracket set. It does not include the actuator arm, motor, control board, transformer, or battery.
How is HB100 different from H101P?
HB100 is the bracket set. H101P is the small hardware bag used with compatible mounting parts.
Can HB100 be used on newer MM371W or MM571W openers?
HB100 is listed for several current and older Mighty Mule models including MM371W, MM372W, MM571W, and MM572W when the bracket requirements match.
Do I need one HB100 per gate or per arm?
Each opener arm requires the correct bracket hardware. A dual-gate system may require hardware for both arms if both sides are being serviced.
Can bad brackets damage an opener arm?
Yes. Bent or incorrectly positioned brackets can cause binding and overloading, which can shorten actuator life.
