These hex socket screw hole plugs are end caps for hex socket screws that seal hydraulic ports and protect threads. They are available in multiple sizes to fit standard hex socket threads and kept in stock for quick replacements. Key benefits - Reliable, leak-proof sealing with socket seal ends to prevent hydraulic leaks and contamination - Durable performance from chemical-resistant PP and POM materials - Easy installation and secure fit for long-term protection of ports and threads Material and compatibility - Made from polypropylene (PP) and polyoxymethylene (POM) - Designed to work with standard hex socket screws and hydraulic thread plugs - Built for durability in harsh hydraulic environments Use scenarios - Hydraulic system maintenance: cap unused ports on cylinders, pumps, and manifolds to prevent leaks during service - Machinery assembly and repair: seal hydraulic ports on presses, conveyors, and CNC machines to keep dirt out - Automotive and industrial service: protect exposed hydraulic lines during repairs and routine maintenance Why it matters - Helps maintain system integrity by preventing leaks and contamination - Reduces downtime with readily available replacements - Provides a consistent, professional seal across compatible equipment