Part 858-621 is a socket screw used to secure critical components in pump and drive assemblies on compatible PowrLiner and Speeflo sprayers. Its internal hex drive allows for precise torque application in tight spaces, ensuring proper clamping force and alignment. Replacing worn or damaged socket screws restores secure assembly and helps prevent mechanical failure.
| Part Number | 858-621 |
|---|---|
| Part Description | Socket Screw |
| Brand | PowrLiner / Speeflo |
| Fits | Extensive range of PowrLiner and Speeflo models including PL4955, PL6955, PL8955, 4000, 8900, 4900XLT, 5000, 6000, 6900XLT, 8900XLT, PowrTex, PowrTwin series and more |
| Condition | New |
The 858-621 Socket Screw is a precision fastener used throughout PowrLiner and Speeflo pump and drive assemblies. Its internal hex drive allows for positive engagement and precise torque application, even in recessed or tight spaces. It is commonly used to secure motor mounts, pump flanges, bearing caps, and other critical components where reliable fastening is essential.
Over time, socket screws can become corroded, have their threads damaged, or experience fatigue from vibration and thermal cycling. A damaged or improperly torqued socket screw can lead to component loosening, misalignment, fluid leaks, or mechanical failure. Replacing worn fasteners with genuine part 858-621 ensures proper clamping force and reliable operation.
| Secure fastening | Holds components together with precise clamping force |
|---|---|
| Alignment maintenance | Prevents shifting of parts that could cause wear or leaks |
| Vibration resistance | When properly torqued, resists loosening from operational vibration |
| Thread damage | Stripped, cross-threaded, or corroded threads |
|---|---|
| Drive damage | Rounded or stripped hex socket |
| Stretching / fatigue | Screw appears necked down or has visible distortion |
| Corrosion | Rust or chemical attack that compromises strength |
Part 858-621 is used across an extensive range of PowrLiner and Speeflo models. Always confirm fitment using the correct parts manual for your specific machine.
| Brand / Series | Model / Part Number |
|---|---|
| PowrLiner | PL4955 0290052H (Global, except for EU) |
| PowrLiner | PL4955 0290052E (EU only) |
| PowrLiner | PL6955 0290053H |
| PowrLiner | PL8955 0290054H |
| PowrLiner | 4000 |
| PowrLiner | 8900 |
| Speeflo PowrLiner | 4900XLT |
| PowrLiner | 4900 |
| PowrLiner | 0290019 (PL4950) |
| PowrLiner | 0290010 (PL6950) |
| PowrLiner | 0290011 (PL8950) |
| Speeflo PowrLiner | 5000 |
| Speeflo PowrLiner | 6000 |
| Speeflo PowrLiner | 6900XLT |
| Speeflo PowrLiner | 8900XLT |
| PowrLiner | 6900XLT |
| Speeflo PowrTex | 6900SF |
| Speeflo PowrTex | 12000SV |
| Speeflo PowrTwin | 3500 |
| Speeflo PowrTwin | 4500 |
| Speeflo PowrTwin | 4900XLT |
| Speeflo PowrTwin Plus | PT4900 (230V) 290032 |
| Speeflo PowrTwin Plus | PT4900 (Gas) 290012 |
| Speeflo PowrTwin Plus | PT6900 (Gas) 290013 |
| Speeflo PowrTwin Plus | PT8900 (Gas) 290018 |
| Speeflo PowrTwin Plus | PT12000 (Gas) 290016 (Honda) |
| Speeflo PowrTwin Plus | PT12000 (Gas) 0290016K (Kohler) |
| Speeflo PowrTwin | 4900GH |
| Speeflo PowrTwin Plus DI | PT6900 Plus DI (120V) 290029 |
| Speeflo PowrTwin Plus DI | PT6900 Plus DI (230V) 290033 |
| Speeflo PowrTwin Plus DI | PT6900 Plus DI (Gas) 290021 |
| Speeflo PowrTwin Plus DI | PT6900 Plus DI (Gas) 290035 |
| Speeflo PowrTwin Plus DI | PT6900 Plus DI (230V) 290061 |
| Speeflo PowrTwin Plus DI | PT12000 Plus DI (400V) 290034 |
| Speeflo PowrTwin Plus DI | PT12000 Plus DI (Gas) 290023 (Honda) |
| Speeflo PowrTwin Plus DI | PT12000 Plus DI (Gas) 0290023K (Kohler) |
| Speeflo PowrTwin | 6900XLT DI |
| Speeflo PowrTwin | 6900XLT |
| Speeflo PowrTwin | 6900GH |
| Speeflo PowrTwin | 8900GH |
| Speeflo PowrTwin | 12000GHD |
| Speeflo PowrTwin | 12000XLT DI |
| Speeflo PowrTwin | 12000XLT |
| Speeflo PowrTwin | 12000GH |
| Speeflo PowrTwin | 12000GHD |
| Speeflo PowrTwin | 8900XLT |
When replacing socket screws, inspect these associated components to ensure a complete repair.
Check for thread damage or corrosion; replace if necessary to maintain clamping integrity.
If screws secure a sealed joint, inspect and replace gaskets to prevent leaks.
For critical applications, apply medium-strength thread locker per manufacturer specs.
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