The Wacker Neuson Socket Head Screw is a genuine OEM socket head screw designed for the APT4S and APT4T pump series. Sourced directly from Wacker Neuson, this is the same part installed at the factory — correct thread form, head geometry, and material grade, exactly as specified for these machines. Compatible fitment spans the full APT4S and APT4T lineup, including standard, cold weather, surge brake, and electric brake configurations. When a fastener in a critical assembly works loose or strips, swapping it with the correct OEM specification screw restores the integrity of that joint and keeps the pump operating as designed.
Key Features
- OEM-Spec Fastener Integrity — Manufactured to the exact thread pitch, tensile grade, and head dimensions specified by Wacker Neuson, ensuring full clamping force in the original joint.
- Direct Drop-In Replacement — Socket head drive pattern matches the original tooling access on APT4S and APT4T assemblies, so installation is straightforward with a standard hex key.
- Broad APT Series Coverage — Fits APT4S and APT4T pumps across standard, cold weather, surge brake, and electric brake variants, covering the complete current model range.
- Maintains Joint Clamping Load — A correctly torqued fastener at the right specification prevents component shift and vibration-induced loosening under pump operating loads.
- Genuine Wacker Neuson Part — Supplied as genuine OEM, backed by Wacker Neuson's parts program — not a substituted fastener sourced to a generic hardware standard.
A socket head screw is a threaded fastener with a cylindrical body and an internal hex drive recessed into the head, designed to be tightened with an Allen or hex key rather than a wrench. In pump assemblies like the APT4S and APT4T, these screws are typically used where access is limited or where a flush, low-profile fastening point is required to secure covers, housings, or internal components. When a socket head screw strips, corrodes, or breaks, the joint it holds can shift or separate under vibration and operating pressure, leading to misalignment, fluid leaks, or component damage. Replacing a worn or failed fastener with the correct OEM part restores the designed clamping load and prevents further damage to the surrounding assembly.
Part Details
| Part Number | 5100040912 |
|---|---|
| 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.
