HySecurity MX4203, Bolt Assembly, Shear
HySecurity MX4203 is a shear bolt assembly for select HySecurity StrongArmDOT 28 barrier gate operator applications. HySecurity parts documentation lists MX4203 as "Bolt Assembly, Shear" under StrongArmDOT 28 arm hardware, and current distributor listings identify it as a shear bolt assembly for StrongArm DOT 28.
This is a controlled-failure arm hardware component used with the approved StrongArmDOT 28 breakaway arm system. It should not be replaced with a standard bolt, generic fastener, or non-factory hardware. The shear bolt assembly is part of the breakaway protection design and should be matched carefully to the operator model, arm hardware, and parts diagram.
What This Shear Bolt Assembly Does
The shear bolt assembly is designed to work with the StrongArmDOT 28 breakaway arm hardware. In an impact or breakaway event, the shear bolt is intended to fail in a controlled way so the breakaway arm hardware can respond as designed and help reduce damage to the barrier arm system.
A damaged, missing, incorrect, overtightened, reused, or non-OEM shear bolt can affect how the breakaway arm hardware responds during an impact. If the wrong bolt is installed, the arm assembly may not release correctly or may allow additional damage to the bracket, sleeve, arm, yoke, counterweight hardware, or operator-side mounting components.
Compatible With
Use HySecurity MX4203 only where the operator parts diagram, original installed hardware, or HySecurity documentation confirms this part number.
- Select HySecurity StrongArmDOT 28 applications where MX4203 is listed as the shear bolt assembly.
- StrongArmDOT 28 breakaway arm hardware repairs where the original shear bolt assembly is listed or cross-referenced as HySecurity MX4203.
- StrongArmDOT 28 models built after February 2018 where the parts diagram confirms MX4203.
- Repairs after an arm impact or breakaway event where the approved StrongArmDOT 28 shear bolt assembly is required.
- Applications where the breakaway bracket, arm sleeve, and shear bolt arrangement match the HySecurity parts diagram.
Important Compatibility Warning
Do not substitute MX4203 with a standard bolt, generic shear pin, different grade fastener, or hardware-store replacement. The shear bolt assembly is intended to fail at the correct point for the approved StrongArmDOT 28 breakaway arm system. Using an incorrect fastener can prevent the arm from breaking away properly or can cause damage to the operator arm hardware during an impact.
MX4203 should not be assumed to fit every StrongArm or every StrongArmDOT configuration. StrongArmDOT 28, StrongArm 14F, StrongArm 20, StrongArm 36, and other StrongArm arm setups can use different arm hardware, breakaway brackets, kill switch components, counterweights, and mounting parts.
Similar Parts That Are Not Automatically Interchangeable
- mx3346-arm-sleeve-strongarmdot-28.html">HySecurity MX3346 - arm sleeve for StrongArmDOT 28; not the same as the shear bolt assembly.
- HySecurity MX4202 - breakaway arm bracket for StrongArmDOT 28; related hardware but not the same part.
- mx3827-breakaway-arm-bracket-kit-kill-switch-strongarm-14f.html">HySecurity MX3827 - breakaway arm bracket with kill switch kit for StrongArm 14F; not the same as MX4203.
- HySecurity MX4402 - kill switch kit; separate electrical/safety-related hardware, not the shear bolt assembly.
- HySecurity MX4057 - LED light / kill switch harness; not the shear bolt assembly.
- mx001090-p-side-mount-bracket-clamps-aluminum-arm.html">HySecurity MX001090 - side mount aluminum arm bracket and clamps; not the same as MX4203.
- mx001043-p-side-mount-bracket-clamps-fiberglass-arm.html">HySecurity MX001043 - side mount fiberglass arm bracket and clamps; not the same as MX4203.
- HySecurity MX001046 - bracket and yoke, counterweight type; not the shear bolt assembly.
- Standard bolts, pins, nuts, or hardware-store fasteners - not approved substitutes for MX4203.
Not Intended For
- Standard StrongArm applications unless the parts diagram specifically lists MX4203.
- StrongArm 14F, StrongArm 20, StrongArm 36, or other StrongArm configurations unless the parts diagram lists MX4203.
- Complete barrier arm replacement.
- Arm sleeve replacement.
- Breakaway bracket replacement.
- Yoke bracket, side-mount bracket, clamp kit, or counterweight replacement.
- Kill switch, LED light harness, controller, gearbox, motor, or cabinet repairs.
- General-purpose fastening or non-HySecurity arm hardware repairs.
Features & Specifications
| Feature / Specification | Details |
| Manufacturer | HySecurity / Nice HySecurity |
| Part Number | MX4203 |
| Product Type | Shear bolt assembly |
| Common Description | Bolt Assembly, Shear |
| Common Application | Select StrongArmDOT 28 breakaway arm hardware applications |
| Operator Family | StrongArmDOT 28, where listed by parts diagram |
| Breakaway Function | Controlled-failure hardware for approved breakaway arm assemblies |
| Build-Date Note | One current listing notes StrongArm DOT 28 models built after February 2018; verify by serial number and parts diagram |
| Electrical Rating | Not applicable - mechanical breakaway hardware component |
| Package Contents | Verify current package contents before ordering; related bracket, sleeve, fasteners, and kill switch components may be separate unless stated |
Also Known As / Related Part Numbers
- MX4203
- HySecurity MX4203
- Nice HySecurity MX4203
- HYS-MX4203
- HYS-mx4203
- HySecurity bolt assembly, shear
- HySecurity shear bolt assembly
- HySecurity StrongArmDOT 28 shear bolt assembly
- Shear Bolt Assembly for StrongArmDOT 28
- Bolt Assembly, Shear
- MX3346 - related StrongArmDOT 28 arm sleeve; not the same part
- MX4202 - related StrongArmDOT 28 breakaway arm bracket; not the same part
- MX3827 - related StrongArm 14F breakaway bracket with kill switch kit; not the same part
Related Parts and Accessories
The correct related parts depend on the installed StrongArmDOT 28 arm hardware, breakaway bracket, arm condition, and reason the shear bolt assembly is being replaced. Inspect the complete breakaway arm area before ordering only the shear bolt assembly.
- MX3346 arm sleeve for StrongArmDOT 28 - related arm hardware, not the same as MX4203.
- MX4202 breakaway arm bracket for StrongArmDOT 28 - related bracket, not the shear bolt assembly.
- Breakaway bracket cover, knobs, or fasteners - verify by parts diagram if damaged or missing.
- Side-mount bracket and clamp kits - verify arm material and mounting style before ordering.
- Yoke brackets and counterweight hardware - inspect if the arm was hit or dropped.
- Kill switch kit or LED light / kill switch harness - inspect if the breakaway event affected wiring.
- Barrier arm sections - inspect for bends, cracks, or impact damage before returning the operator to service.
Technician Note
MX4203 should be replaced with the correct HySecurity shear bolt assembly after a breakaway or impact event where the shear bolt has failed. Do not reuse a damaged shear bolt and do not install a generic bolt in its place. The shear bolt is part of the controlled breakaway design, and the wrong fastener can change how the arm assembly reacts during the next impact.
Before replacing the shear bolt assembly, inspect the breakaway bracket, arm sleeve, barrier arm, yoke, clamps, counterweight setup, fasteners, kill switch wiring, and operator-side mounting points. If the arm was hit, there may be damage beyond the shear bolt itself.
Before Ordering, Confirm
- The required part number is MX4203.
- The operator is a HySecurity StrongArmDOT 28 application.
- The parts diagram lists MX4203 as the correct shear bolt assembly for the installed arm hardware.
- The operator build date or serial number matches the parts reference being used, especially for models built after February 2018.
- The repair requires the shear bolt assembly, not the arm sleeve, breakaway bracket, yoke, clamp kit, counterweight, or complete arm.
- The breakaway bracket, arm sleeve, arm tube, and related hardware are not damaged beyond shear bolt replacement.
- The kill switch or breakaway wiring has been inspected if the arm was hit or released.
- The package includes the expected assembly, or any additional fasteners and related parts are ordered separately if required.
Installation and Service Notes
- Secure the barrier arm before servicing breakaway arm hardware.
- Do not work under an unsupported arm or counterweight-loaded arm assembly.
- Use the correct HySecurity shear bolt assembly; do not substitute generic bolts or different-grade hardware.
- Inspect the breakaway bracket and arm sleeve before installing the replacement shear bolt assembly.
- Confirm correct alignment and bracket position before tightening related hardware.
- After service, verify arm alignment, breakaway function where applicable, counterweight balance, and normal barrier movement.
- Confirm any kill switch, LED harness, controller input, and required safety devices remain connected and working properly.
Professional Advisory
StrongArmDOT breakaway arm hardware should be serviced by a qualified gate technician when the repair follows an impact, breakaway event, arm drop, counterweight issue, structural damage, wiring damage, or unknown prior modification. Do not bypass breakaway switches, kill switches, controller protections, arm safety systems, access control safety inputs, or any required safety devices to keep the operator running.
Product Questions & Answers
What is HySecurity MX4203?
HySecurity MX4203 is a shear bolt assembly for select StrongArmDOT 28 barrier gate operator breakaway arm hardware.
Does MX4203 fit all StrongArm operators?
No. MX4203 is listed for StrongArmDOT 28 applications. Use it on other StrongArm operators only if the HySecurity parts diagram specifically lists this part number.
Can I replace MX4203 with a regular bolt?
No. MX4203 is a controlled-failure shear bolt assembly. A standard bolt or generic fastener should not be used because it can change how the breakaway arm hardware responds during an impact.
Should MX4203 be replaced after the arm is hit?
Yes, if the shear bolt has failed or the breakaway hardware was activated. Current listings note that this part must be replaced on DOT models if the arm is hit. Inspect the full arm hardware assembly before returning the operator to service.
Is MX4203 the same as the StrongArmDOT 28 arm sleeve?
No. MX4203 is the shear bolt assembly. The StrongArmDOT 28 arm sleeve is a separate part commonly listed as MX3346.
What should be inspected when replacing the shear bolt assembly?
Inspect the breakaway bracket, arm sleeve, barrier arm, yoke, clamps, counterweights, fasteners, kill switch wiring, and operator-side mounting points before replacing only the shear bolt assembly.
Should a technician install this shear bolt assembly?
A qualified gate technician is recommended, especially if the repair follows an impact, breakaway event, arm drop, counterweight issue, kill switch wiring damage, or unknown prior modifications.
