The Wacker Neuson Socket Head Screw is a genuine OEM socket head screw designed for the APT4S and APT4T pump series, including cold weather variants. As a factory-authorized component, this screw is produced to the same specifications as the original hardware installed on your machine, ensuring a consistent, secure fit within the pump assembly. Compatible across the APT4S Pump with Skid, APT4T Pump with Surge Brake, and APT4T Pump with Electric Brake — as well as their respective cold weather configurations — this part covers a broad range of Wacker Neuson portable pump models. When hardware fails or goes missing, replacing it with the correct OEM part keeps the assembly properly torqued and structurally sound.
Key Features
- OEM Thread and Head Geometry — Manufactured to exact thread pitch, head dimensions, and drive socket specifications, so fastener engagement is consistent and torque is applied correctly without stripping.
- Direct Hardware Replacement — Drops into the existing mounting position on the pump assembly with no reworking of surrounding components or fastener seats.
- Broad APT Series Coverage — Fits APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and all corresponding cold weather variants, covering six distinct pump configurations under part number 5100040913.
- Assembly Integrity — A correctly rated socket head screw maintains the clamping force needed to keep pump components properly seated under operational vibration and load; a stripped or incorrect fastener can allow movement that leads to larger component damage.
- Genuine Wacker Neuson Part — Sourced directly through the Wacker Neuson OEM supply chain, so the alloy grade, surface treatment, and dimensional tolerances match what left the factory originally.
A socket head screw is a threaded fastener driven by an internal hex (Allen) key socket recessed into the head, allowing it to be installed flush with or below the surface of a component. In pump assemblies, these screws are used to secure covers, brackets, and housings under conditions where a standard bolt head would interfere with adjacent parts or require clearance that isn't available. When a socket head screw becomes stripped, corroded, or lost, the clamping force holding that joint together is compromised — potentially allowing components to shift, leak, or vibrate loose during operation. Replacing it promptly with the correct OEM fastener restores the structural integrity of the joint and prevents escalating damage to surrounding parts.
Part Details
| Part Number | 5100040913 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Socket Head Screw |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
