The Wacker Neuson Hexagonal Flange Head Screw is a genuine OEM component designed for the APT4S and APT4T pump series, including standard, surge brake, electric brake, and cold weather configurations. As a direct OEM replacement, this screw is sourced from Wacker Neuson and matches the original specification for a straightforward, confident repair. Confirmed fitment spans the full APT4S and APT4T lineup — including APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and their cold weather variants — so you can order knowing is the correct part for your machine.
Key Features
- OEM-Grade Fastener Integrity — Manufactured to Wacker Neuson's original torque and clamping specifications, ensuring the screw seats and holds exactly as intended in the pump assembly.
- Drop-In Installation — Matches the original thread pitch, drive type, and flange geometry, so it installs directly without modification or thread chasing.
- Broad APT Series Coverage — Fits the full APT4S and APT4T pump families, including surge brake, electric brake, and cold weather variants, under a single part number.
- Secure Flange Design — The integrated flange distributes clamping load evenly across the mating surface, resisting loosening from vibration during pump operation.
- Verified Wacker Neuson Part Number — Ordering by OEM part number 5200019878 eliminates guesswork and ensures you receive the exact fastener called out in the Wacker Neuson parts diagram.
A hexagonal flange head screw is a fastener that combines a standard hex head with a built-in flanged washer base, creating a wider bearing surface that spreads clamping force and resists vibration-induced loosening. In pump assemblies like the APT4S and APT4T series, fasteners of this type secure critical housings, brackets, and covers that must remain tight under continuous mechanical vibration and pressure. When a fastener of this type strips, corrodes, or fails to clamp properly, it can allow components to shift or leak, compromising pump performance and potentially causing further damage to surrounding parts.
Part Details
| Part Number | 5200019878 |
|---|---|
| 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.
