Part number 858-644 is a genuine screw used in a wide range of PowrLiner and ProMark II airless sprayers. This precision fastener is designed for securing critical components such as housings, covers, motor mounts, and pump assemblies. It features the correct thread pitch, length, and head type to match factory specifications, ensuring proper clamping force and reliable assembly. Using the correct OEM fastener helps prevent loosening from vibration and maintains the structural integrity of the sprayer.
| Part Number | 858-644 |
|---|---|
| Part Description | Screw |
| Brand |
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| Fits |
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| Condition | New |
The 858-644 Screw is a genuine OEM replacement fastener designed for a wide range of PowrLiner and ProMark II airless sprayers. It is manufactured to exact factory specifications, ensuring proper fit, thread engagement, and clamping force when securing components such as motor mounts, pump housings, control panel covers, handle assemblies, and structural brackets.
Using the correct fastener is essential for maintaining the structural integrity of the sprayer. An incorrect screw can strip threads, loosen under vibration, or fail to provide adequate clamping pressure, potentially leading to component misalignment, fluid leaks, or operational issues. This genuine replacement screw restores secure fastening and reliable performance.
This screw is designed to withstand the vibration, pressure cycles, and environmental conditions common in sprayer operation. Proper fastener selection ensures that critical assemblies remain tight and properly aligned throughout the equipment's service life.
| Component retention | Secures housings, covers, and internal components in place |
|---|---|
| Vibration resistance | Proper thread engagement prevents loosening during operation |
| Structural integrity | Maintains proper alignment and clamping force of assemblies |
| Load distribution | Distributes clamping load evenly across connected parts |
| Stripped threads | Screw will not tighten properly or spins freely |
|---|---|
| Missing screws | Fastener is lost during disassembly or service |
| Corrosion / rust | Screw head or threads are corroded, making removal difficult |
| Cam-out / damaged head | Drive recess is worn and tool no longer engages securely |
Part 858-644 is compatible with the following sprayer models. Always verify your machine's parts diagram to confirm correct fitment.
| Brand / Model | Component |
|---|---|
| PowrLiner 2850 | Screw |
| PowrLiner 4955 | Screw |
| PowrLiner 6955 | Screw |
| PowrLiner 8955 | Screw |
| PowrLiner 550 | Screw |
| PowrLiner 2800 | Screw |
| PowrLiner 1800M / 2800M | Screw |
| PowrLiner 4900XLT | Screw |
| PowrLiner 4900 | Screw |
| PowrLiner 6900 XLT SP | Screw |
| PowrLiner 6900XLT | Screw |
| PowrLiner 800 | Screw |
| PowrLiner 4950 | Screw |
| PowrLiner 6950 | Screw |
| PowrLiner 8950 | Screw |
| PowrLiner 8900XLT SP | Screw |
| PowrLiner 8900XLT | Screw |
| PowrLiner 6950 | Screw |
| PowrLiner 8900 | Screw |
| ProMark II (Model No. 759-2010) | Screw |
When replacing screws during service, it's good practice to inspect these related components.
Flat or lock washers used with the screw may be crushed or worn. Replace them to maintain proper clamping force.
If threads in the mating component are damaged, a thread repair insert or replacement nut may be needed.
Inspect plastic or metal covers for cracks around mounting holes that may have contributed to screw loosening.
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