ASAB DDP42 Replacement Parts #20 - M8*25 Hex Screw

Part Code: ASAB-SDDP42-20

Introducing the DDP42 M8×25 Hex Screw — a high-strength fastener used across ASAB DDP42 double diaphragm pump assemblies to securely clamp housings, plates, and valve components under vibration and repeated cycling. This fastener is designed to provide consistent clamping force and reliable service access, making it a go-to replacement during rebuilds and wet-end servicing.

If a pump has been stripped a few times, screws often end up rounded, stretched, corroded, seized, or contaminated with product, which can lead to uneven torque, sealing issues, and repeat leaks. Replacing hardware with the correct M8×25 screw helps ensure proper alignment, correct gasket compression, and long-term reliability of the assembly.

Whether you’re doing a full wet-end rebuild, refreshing hardware as preventative maintenance, or replacing a bolt that’s been flogged out by the “just one more turn” brigade, the ASAB-SDDP42-20 is the right fastener to keep your DDP42 clamped up properly.

Key Benefits

• Correct replacement fastener for ASAB DDP42 assemblies

• M8 × 25mm sizing for proper fit and clamp load

• Helps maintain even clamping pressure for better sealing and alignment

• Ideal replacement for screws that are rounded, stretched, corroded, or seized

• Supports reliability under vibration and repeated pump cycling

• Smart to replace during major services / rebuilds for consistent torque retention

• Workshop-ready spare for fast rebuilds and repairs

What’s Included

• DDP42 M8×25 Hex Screw — ASAB-SDDP42-20

Safety Check

• Isolate and depressurise first: Shut off air supply, bleed the airline fully, and confirm the pump is not pressurised before disassembly.

• Use the correct tool: Clean the head/drive and use the correct driver size to avoid rounding.

• Don’t over-torque: Over-tightening can strip threads or warp housings and cause leaks—tighten evenly in a cross pattern where applicable.

• Check thread condition: If threads in the housing are damaged, replacing the screw alone won’t hold—inspect and repair threads as needed.

• Replace as a set where possible: Mixing old stretched screws with new can cause uneven clamp loads.

• Test after assembly: Bring air pressure up slowly and check for leaks or abnormal cycling before returning to service.

ASAB – Engineered for Performance, Built to Last.