Non-standard stainless steel hollow double end bolts, extended hollow bolts and oil injection screws are professional industrial fasteners widely used in mechanical equipment, hydraulic machinery, hardware assembly, pipeline connection and industrial maintenance fields. Made of high-quality stainless steel, these extended hollow fasteners adopt hollow structure and extended rod design, with professional oil injection function, featuring excellent corrosion resistance, high strength and long service life. Non-standard customization and extended length can fully meet various special assembly, oil delivery and extension connection demands. Precision machined threads ensure tight fit and stable connection, suitable for long-term use in different industrial working environments. With reliable quality and wide applicability, these non-standard stainless steel hollow extended bolts are ideal for global hardware importers, mechanical manufacturers and engineering enterprises, providing professional and practical fastening solutions for international industrial projects.