Part number 3126242 is a genuine lock nut SM-M 25x1,5 used in Elite 5500 and PowrLiner 4500/5500 airless sprayers. This metric lock nut features a 25mm thread with 1.5mm pitch and incorporates a locking mechanism to prevent loosening from vibration during operation. It is manufactured to exact factory specifications for thread class, material hardness, and locking torque, ensuring secure fastening of critical components. A worn, stripped, or damaged lock nut can lead to component loosening, misalignment, and potential equipment failure. This genuine replacement restores proper clamping force and reliable operation.
| Part Number | 3126242 |
|---|---|
| Part Description | Lock Nut SM-M 25x1,5 |
| Brand |
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| Fits |
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| Condition | New |
The 3126242 Lock Nut SM-M 25x1,5 is a genuine OEM fastener designed for Elite 5500 and PowrLiner 4500/5500 airless sprayers. This metric lock nut features a 25mm diameter thread with 1.5mm pitch (M25x1.5) and incorporates an integral locking mechanism—typically a nylon insert or deformed thread—that resists loosening under vibration and dynamic loads.
Lock nuts are essential in applications where components are subject to continuous vibration from pump operation, motor rotation, and equipment movement. Unlike standard nuts, lock nuts maintain clamping force even when subjected to shock and vibration, preventing fasteners from backing off and causing component misalignment, fluid leaks, or mechanical failure.
This genuine lock nut is manufactured to exact factory specifications for thread class, material grade, and locking torque. Using the correct lock nut ensures proper preload, maintains joint integrity, and prevents damage to mating threads. A worn, stripped, or damaged lock nut can compromise safety and lead to costly repairs. Replacing with this genuine part restores secure fastening and reliable operation.
| Vibration resistance | Prevents loosening under dynamic loads and vibration |
|---|---|
| Clamp force retention | Maintains proper clamping force over time |
| Thread protection | Distributes load evenly to protect mating threads |
| Component retention | Secures critical components in position |
| Stripped threads | Nut will not engage or tighten properly |
|---|---|
| Worn locking feature | Nylon insert worn or deformed threads no longer lock |
| Corrosion / rust | Visible corrosion affecting nut integrity |
| After removal | Replace lock nuts when disassembled (one-time use recommended) |
Part 3126242 is designed for the following sprayer models. Always verify your machine's parts diagram to confirm correct fitment.
| Brand / Model | Component |
|---|---|
| Elite 5500 | Lock Nut SM-M 25x1,5 |
| PowrLiner 4500 | Lock Nut SM-M 25x1,5 |
| PowrLiner 5500 | Lock Nut SM-M 25x1,5 |
When replacing lock nuts, it's good practice to inspect these related components.
Inspect mating bolts for thread damage, stretch, or wear. Replace if necessary.
Check washers for deformation or crushing. Replace to maintain proper clamping.
Inspect surfaces for damage or debris that could affect proper seating.
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