HySecurity MX000557 is an aluminum arm retainer half used in HySecurity StrongArm barrier arm assemblies. The retainer helps clamp or support the barrier arm in the correct mounting assembly so the arm remains secured during normal open and close cycles. It is a service item to consider when the original retainer is cracked, bent, missing, stripped, or no longer holds the arm properly. This is only one retainer half, so the technician should inspect the complete retainer set, arm hardware, fasteners, and arm profile before ordering. StrongArm, StrongArmPark, StrongArm M30/M50, and similar barrier-style products can use different arm assemblies and hardware, so verify the exact parts diagram.
| Manufacturer | HySecurity / Nice |
|---|---|
| Part Number | MX000557 |
| Product Type | Arm retainer half |
| Material | Aluminum |
| Application | Barrier arm retention hardware |
| Quantity | One retainer half unless product listing states otherwise |
| Notes | Verify arm profile and matching retainer hardware |
If an arm retainer failed because the arm was struck, inspect the arm, hub, mounting plate, bolts, and operator stop settings before replacing only the retainer.
Barrier arm service should be performed with the operator disabled. Long arms can drop or swing unexpectedly if hardware is loosened without support.
Do not assume all StrongArm retainer halves are the same. Match MX000557 to the arm and operator parts diagram.
HySecurity MX000557 is used as a replacement aluminum arm retainer half in select HySecurity StrongArm barrier arm assemblies. Match it to the original part number and the operator parts diagram before ordering.
Compare the part number on the existing component, the operator model, the control system generation, and the physical or electrical specifications shown in the parts diagram.
The part name identifies this as an arm retainer half. Verify quantity and included hardware before ordering.
Replace it when it is cracked, stripped, bent, missing, or no longer secures the barrier arm correctly.
A qualified gate technician is recommended whenever the repair involves electrical wiring, stored energy, moving gate hardware, hydraulic components, or safety-related operation.