Custom Hollow Threaded Studs Manufacturer – Double-Ended Stud Bolt for Automotive & Aerospace

Product Content:

Custom Hollow Threaded Studs Manufacturer – Double-Ended Stud Bolt for Automotive & Aerospace from Qimao Metal Manufacturer, double-ended configuration with one thread length longer than the other. We cold head them from steel wire—C10C, 10B21, SCM435, or stainless grades depending on your strength requirements. The hollow core runs all the way through, center to center. What’s that for? Weight reduction primarily—solid studs are heavy and you’re paying for material that gets drilled out anyway. Also lets you pass wiring, small-diameter tubing, or hydraulic fluid straight through the stud itself, eliminating separate bulkhead fittings in tight spaces. Threads are formed on both ends during secondary operations after heading. The longer end typically takes a nut or threads into a housing, the shorter end gets capped or receives a secondary component. We supply these as finished parts—threads gauged, ends chamfered, ready to install.

Product Specification:

Technical Details:

The Custom Hollow Threaded Studs Manufacturer – Double-Ended Stud Bolt for Automotive & Aerospace thread sizes range from M4 up to M12, inch sizes also available. Overall length varies from about 25mm to 100mm, longer possible but material availability starts to limit what we can do in one piece. Long thread end typically runs 1.5x to 2x the diameter in length, short end about 1x diameter—but we’ve done all kinds of ratios depending on what the application calls for. Hollow bore diameter depends on your needs and the outer diameter—generally we keep wall thickness above 1.5mm minimum for structural integrity. Wall thickness isn’t perfectly uniform across the entire length—thread rolling affects the OD at the ends, but the bore stays straight through. Materials as mentioned: carbon steels for general use, alloy steel when you need higher tensile, and stainless when corrosion or hygiene is a concern. Thread class is 6g for external threads, with go/no-go gauging on every piece. Zinc plating, phosphating, or black oxide available if your spec calls for it.

Core Advantages:

• • Custom Hollow Threaded Studs Manufacturer – Double-Ended Stud Bolt for Automotive & Aerospace hollow center eliminates separate bulkhead fittings. Run wiring, tubing, or fluid lines straight through the stud itself. Saves machining and reduces leak points.

  • Cold heading preserves grain structure. Unlike drilled bar stock, headed studs keep continuous grain flow—better tensile strength and vibration resistance.

  • One long thread end, one short end. Longer end goes deeper into tapped housings. Shorter end works where clearance is tight.

  • Threads are rolled, not cut. Rolled threads have compressed grain structure at the root—stronger and more fatigue resistant. No chips to clean up.

  • Weight reduction runs 20% to 40% compared to solid studs. Reduces load on surrounding structure.

  • Minimum wall thickness typically 1.5mm to maintain strength. We’ll check your length and load requirements before recommending bore size.

  • Minimum wall thickness typically 1.5mm to maintain strength. We’ll check all detalil specification.

Wide Usage:

• Custom Hollow Threaded Studs Manufacturer – Double-Ended Stud Bolt for Automotive & Aerospace for engine block applications. Oil or coolant lines run right through the mounting point—no extra bulkhead fittings needed, which keeps plumbing simpler and reduces potential leak paths.

• Aerospace bulkhead structures. Wiring passes through the stud itself rather than requiring a separate feed-through hole in the panel. Saves drilling operations and keeps the airframe cleaner.

• Hydraulic systems on heavy equipment. Space is always tight in these assemblies, so combining fastening with fluid passage gives you routing options you wouldn’t have with separate components.

• Electronics enclosures and control boxes. Sensor wiring or small gauge cables pass cleanly through the threaded mounting stud, eliminating an extra hole and grommet in the housing.

• Pneumatic actuator pivots. Air lines run through the hollow center at the rotation point—keeps tubing out of the way of moving parts and simplifies the overall assembly layout.

• Motor mount brackets with integral cooling. Coolant lines exit the motor housing right at the mounting location, and the hollow stud handles both the fastening and the fluid path.

• Race car and performance builds. Weight savings drive a lot of decisions in these applications, and the hollow stud gives builders an edge over solid hardware without compromising strength.