T head bolts with shoulder

a) External hexalobular socket (6 lobe) / metric thread / self tapping thread for thermoplastics.

b) A double-end stud with collar is a type of fastener that features threaded ends on both sides and a non-threaded central collar or flange. Thread types of both sides can be customized according to customer's request, differen surface treatment is available upon request. 

Special design for an internal thread tube, mushroom head, partially knurled body

This screw features two distinct ends, each designed for a specific function.

a.) A knurled head screw with internal threads inside the hole and grooves around the head is a specialized fastener designed for applications requiring manual tightening or where a secure grip is needed.

b.) The knurled head features textured grooves around its circumference, providing enhanced grip for hand-tightening or loosening. Meanwhile, the internal threads inside the hole enable the screw to be securely fastened to a threaded component or inserted into a pre-threaded hole.

a.) It is a type of fastener that features a cylindrical-shaped head and an integrated collar or flange beneath the head.

b.) The flange serves multiple functions, including providing a larger bearing surface, distributing load more evenly, and enhancing the bolt's stability when installed.

a) Clinch studs, also known as self-clinching studs, are fasteners used in sheet metal fabrication and other applications where strong, permanent fastening is required. They typically consist of a threaded stud with a knurled or serrated shank and a flat or flanged head.

b) The installation process involves inserting the clinch stud into a pre-punched or drilled hole in the metal sheet. Then, using a press or similar tool, the knurled portion of the stud is compressed into the surrounding metal, creating a secure and permanent attachment without the need for welding or additional hardware. They offer advantages such as high strength, resistance to vibration, and a low-profile installation.