Caparo 1 inch Dia Half Threaded Socket Head Cap Bolt Screw Grade 12.9 (Pack of 5)

The Caparo 1 inch diameter half-threaded socket head cap bolt screw, Grade 12.9, is a high-strength fastener designed for critical applications where strong, reliable connections are essential. Packaged in a set of five, these bolts are ideal for both professional and heavy industrial use.

These bolts feature a unique half-threaded design, with threads that begin midway along the shank and extend to the tip. This configuration provides a non-threaded shoulder area, which is thicker and more robust, ideal for bearing higher loads and reducing stress concentration at the first thread, which is common in fully threaded bolts. The half-threaded design is particularly beneficial in applications where alignment and shear resistance are crucial, as the smooth shank can effectively bear the shear forces.

Constructed from Grade 12.9 steel, these bolts exhibit exceptional tensile strength, characterized by a minimum tensile strength of 1220 MPa. This makes them one of the strongest standard fasteners available, suitable for demanding applications such as machine assembly, automotive, construction, and heavy equipment maintenance.

The socket head cap design allows for driving with an Allen wrench or hex key, providing more controlled torque and enabling tightening in confined spaces where traditional external wrenches cannot be used. This feature is especially useful in assemblies with limited overhead space or where a clean, flush surface finish is desired.

Finished with a black oxide coating, these bolts offer added corrosion resistance and durability, making them suitable for both indoor and outdoor applications. The aesthetic quality of this finish also ensures that they blend seamlessly into the component or machine, providing a sleek and professional appearance.