Wacker Neuson 5000025588 Screw 5/16-18 X 1 Socket Head Mz

The Wacker Neuson Screw 5/16-18 X 1 Socket Head Mz is a genuine OEM fastener designed for the PDT and PDI series diaphragm trash pumps, including 50mm/2-inch and 75mm/3-inch models. As a direct OEM replacement, is manufactured to the exact thread pitch, length, and zinc-phosphate finish specified by Wacker Neuson for these pumps. Fitment spans the PDT2, PDT2A, PDT2B, PDT3, PDT3A, PDI2, PDI2A, PDI3, and PDI3A pump families, covering both inline and standard configurations. Ordering by part number ensures you receive the correct fastener the first time, avoiding the delays that come with trial-and-error substitutions.

Key Features

• OEM Thread and Finish Accuracy — Manufactured to the exact 5/16-18 UNC thread specification and metric zinc (Mz) surface finish called out in the Wacker Neuson parts schema, ensuring proper torque engagement without galling or corrosion.
• Socket Head Drive — The internal hex socket head allows use of a standard Allen/hex key in tight pump housing clearances where an open-end or Phillips-head fastener would be difficult to seat or torque correctly.
• Broad PDT and PDI Series Coverage — A single part number covers both standard (PDT) and inline (PDI) diaphragm trash pump variants across the 2-inch and 3-inch discharge size ranges, from PDT2/PDT2A/PDT2B through PDT3/PDT3A and PDI2/PDI2A through PDI3/PDI3A.
• Structural Integrity at the Pump Housing — Fasteners in diaphragm pump assemblies maintain the clamping load that keeps pump housing sections sealed under cyclic pressure; a worn, stripped, or incorrect screw compromises that seal and can cause fluid bypass or housing separation under load.
• Genuine Wacker Neuson OEM Part — Sourced directly through the Wacker Neuson parts supply chain, so the material grade, plating, and dimensional tolerances match the original hardware installed at the factory.

This screw serves as a structural fastener in the housing and cover assembly of Wacker Neuson diaphragm trash pumps. It clamps pump body sections together and maintains the compressive load required to keep internal sealing surfaces tight under the repeated pressure cycles that diaphragm pumps generate during operation. When a fastener of this type loosens, stretches, or strips, the housing can shift or weep, leading to reduced pumping efficiency and potential ingress of debris into the pump mechanism. Using the correct OEM specification screw — right thread form, length, and surface treatment — ensures the joint holds to design intent and that re-torquing during service restores the original clamping performance.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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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.

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