Part Code: ASAB-SDDP42-7
Introducing the DDP42 M8×25 Hex Socket Screw — a high-strength socket head cap screw used across ASAB DDP42 double diaphragm pump assemblies to clamp housings, plates, and valve components securely under vibration and repeated cycling. The hex socket head makes servicing easier in tight spots and helps ensure reliable tool engagement for consistent torque during rebuilds.
Fasteners on diaphragm pumps live a hard life — repeated strip-downs, corrosion, product contamination, and the occasional “rattle gun special” can leave screws rounded, stretched, seized, or thread-damaged, which leads to uneven clamping, sealing issues, and repeat leaks. Replacing worn hardware with the correct M8×25 socket screw is a simple way to restore proper clamp load and keep the assembly tight and reliable.
Whether you’re doing a full wet-end rebuild, refreshing hardware as preventative maintenance, or replacing a bolt that’s been flogged out, the ASAB-SDDP42-7 is the right fastener to keep your DDP42 clamped up properly.
Key Benefits
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Correct replacement fastener for ASAB DDP42 assemblies
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M8 × 25mm sizing for proper fit and clamp load
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Hex socket head for solid tool engagement and easy servicing
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Helps maintain even clamping pressure for better sealing and alignment
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Ideal replacement for screws that are rounded, stretched, corroded, or seized
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Supports reliability under vibration and repeated pump cycling
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Workshop-ready spare for fast rebuilds and repairs
What’s Included
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DDP42 M8×25 Hex Socket Screw — ASAB-SDDP42-7
Safety Check
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Isolate and depressurise first: Shut off air supply, bleed the airline fully, and confirm the pump is not pressurised before disassembly.
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Use the correct hex key: Clean the socket and use the correct size to avoid rounding the head.
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Don’t over-torque: Over-tightening can strip threads or warp housings—tighten evenly in a cross pattern where applicable.
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Check thread condition: If housing threads are damaged, replacing the screw alone won’t hold—inspect and repair as needed.
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Replace as a set where possible: Mixing old stretched screws with new can cause uneven clamp loads.
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Test after assembly: Bring air pressure up slowly and check for leaks or abnormal cycling before returning to service.