A Clinsert is a type of threaded insert used for increasing thread strength in low strength materials, alloys, steel, and cast iron. It is made from stainless steel 1.4305 or AISI303 and is designed to provide high resistance to insert pullout or torque out once installed. Clinserts have 2 or 4 pre-assembled Clins (locking elements) depending on the size of the external thread. After installation of the Clins into the parent material, the assembly is positively locked in place.

The installation of Clinserts involves using a broaching tool to pre-broach the slots for the Clins, especially in hard materials with a hardness greater than 30 HRC or 300 Vickers. The broaching tool is necessary to ensure proper installation of the Clinserts in hard materials. The first step in the installation process is to mark the position of the Clins on the parent material by winding the Clinserts in until the Clins touch the surface of the parent material. The positions of the Clins are then marked, and the Clinserts are unwound. The broaching tool is then used to line up the blades with the marked positions and push it in with a hammer or under a press. After removing the tool, the Clinserts can be installed.

Clinserts are available in different sizes and configurations, and there are also starter kits and refill kits available that contain multiple Clinserts for convenience. Some Clinserts, like the CLS13, are completely solid and can be used to replace misplaced holes by repositioning the hole in the insert itself. Other Clinserts, such as the CL-71614-KS and CL-3416-KS, have thick, heavy-duty threaded walls to ensure high pull-out strengths.