The Wacker Neuson Hexagonal Flange Head Screw is a genuine OEM component designed for the APT4S and APT4T pump series, including surge brake, electric brake, and cold weather variants. As a factory-sourced part, is manufactured to the same specification as the original hardware, ensuring a direct, no-guesswork installation. This screw fits across the full APT4S and APT4T lineup, covering both standard and cold weather configurations. Keeping the correct fastener in place is essential to maintaining the structural integrity and safe operation of your pump assembly.
Key Features
- Genuine OEM Fastener Spec — Manufactured to the exact thread pitch, head geometry, and flange diameter of the original screw, so clamping load is distributed correctly across mating surfaces.
- Drop-In Hardware Replacement — Matches the original bolt pattern and drive type, allowing straightforward installation with standard hex tooling — no reworking of mounting points needed.
- Broad APT Series Coverage — Fits APT4S (with skid), APT4T (surge brake and electric brake), and all corresponding cold weather variants, making this a versatile stock item for fleets running multiple pump configurations.
- Flange Design Maintains Clamping Integrity — The integrated flange distributes load evenly without a separate washer, resisting loosening under vibration and repeated operational stress common in pump environments.
- Secure Fastening Supports Safe Pump Operation — A correctly torqued flange head screw keeps critical assemblies seated and sealed; a stripped or wrong-spec fastener can compromise housing alignment and create leak points in pressurized systems.
A hexagonal flange head screw is a fastener that combines a standard hex bolt head with an integrated flange — a wider, washer-like base built into the head itself. This flange spreads the clamping force over a larger surface area, which helps prevent the fastener from pulling through or deforming softer mounting surfaces and keeps connections tight under vibration. In pump assemblies like the APT4S and APT4T, these screws are typically used to secure housings, covers, or bracketry where maintaining consistent clamping pressure is critical to preventing leaks and keeping components properly aligned. When a fastener of this type is missing, under-torqued, or replaced with an incorrect spec, it can lead to loosening over time, misalignment of mated components, and potential fluid leakage.
Part Details
| Part Number | 5200019863 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Hexagonal Flange 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.
