Hollow Allen Bolts

Hollow Allen bolts are socket head cap screws with a hollow core, designed for applications requiring reduced weight, compact size, and internal wrenching. They are commonly used in aerospace, robotics, medical devices, electronics, and lightweight structures where high strength-to-weight ratio is essential. These bolts allow for torque-driven tightening while minimizing stress on the surrounding material, making them ideal for precision and performance-critical assemblies.

We offer hollow Allen bolts in materials like stainless steel 304/316, alloy steel, titanium, Inconel, Monel, and other high-performance metals. Available surface finishes include zinc plating, black oxide, passivation, PTFE coating, and anodizing depending on application needs. These materials and coatings provide resistance to corrosion, wear, and high temperatures, ensuring reliability in harsh operating environments. Custom finishes are available on request for industrial or aerospace use.

While hollow Allen bolts have a lighter core, they are designed to retain significant tensile strength when manufactured from high-performance materials like titanium, stainless steel, or Inconel. For most applications requiring both lightweight characteristics and durability, they perform exceptionally well. These bolts undergo strict testing for shear, tensile, and fatigue strength to ensure they meet performance specifications demanded by aerospace, precision instrumentation, and critical mechanical assemblies.