The key locking thread insert is a new type of internal thread fastener, mainly used to enhance and protect the internal threads of low-strength materials. Its principle forms an elastic connection between the screw and the internal thread of the base, eliminating thread manufacturing errors and improving the connection strength. The latch screw is screwed onto the sliding buckle, thus forming a stainless steel internal thread, which prevents the buckle from sliding.
The use of key locking thread inserts can improve the impact and vibration resistance of bolts and help prevent bolts from loosening. Moreover, the key locking thread insert has good corrosion resistance, which can ensure its applicability and performance in a variety of materials and environments. Under the same strength conditions as ordinary internal threads, nails with smaller size and higher strength can be used, which can save a lot of material, reduce weight and reduce volume.
The diameter of the key locking thread insert in the free state is slightly larger than the installed internal thread. During the assembly process, the torque added by the installation tool to the installation handle causes the diameter of the guide ring to elastically shrink, thus introducing the pre-used tap for the latch sleeve (ST tap). ) After tapping into the internal thread hole, after installation, the pin nut will expand like a spring, making it firmly fixed in the internal thread hole. In this way, the key locking thread insert will form a high-precision internal thread that meets international standards. Pitch and angle errors that lead to uneven stress distribution between the bolt and the screw hole can be balanced by the elasticity of the key locking thread insert, whose entire helix can share the load.
Generally, carbon steel and alloy steel bolts will fail when there are obvious corrosion products and thinning on the surface, while the key locking thread insert will lose strength when there is almost no change visible on the surface, causing serious damage to the structure or equipment. Its failure is more hidden and harmful.
Screw it into the specially enlarged special screw hole. The outer surface of the key locking thread insert tightly fits the internal screw hole by elastic force, and its inner surface forms a standard internal thread. When matched with screws (bolts), the threaded connection can be significantly improved. The strength and wear resistance form an elastic connection, which eliminates the pitch and tooth profile half-angle errors between the internal and external threads, and evenly distributes the load on the threads.
The characteristics of the key locking thread insert material itself and its smooth surface will prevent the mating base body from rusting when used in harsh environments such as moisture and corrosion, thus avoiding the loss of expensive base body replacement due to rusted threaded holes that cannot be disassembled. It can be used in chemical industry, aviation, military equipment and other occasions that require high insurance coefficients.
At the same time, everyone should also pay attention to regular inspections to prevent loosening and affecting our work.
When thread machining errors occur or damaged internal threads are repaired, the use of key locking thread insert can bring the base body back to life and allow the original screws to be used, which is fast and economical. To give a simple example, diesel engine bodies, textile parts, various aluminum machine parts, lathe tool tables, etc. will be scrapped due to damage to a screw hole. As long as it is re-tapped and a threaded sleeve is installed, the scrap piece will be brought back to life.
Key locking thread insert are thread repair supplies and are used in machinery in all walks of life. It can increase the thread strength, increase the thread connection degree, increase the stress surface, etc., and can bring a lot of convenience to life. At the same time, the service life of the key locking thread insert is still relatively long. The thread surface, supporting surface and connected surface in the bolt connection The uneven contact surfaces of parts caused by processing will cause local plastic deformation when the bolts are pre-tightened. This deformation will stop when the bolts are pre-tightened. However, during use, since the bolted connection will be affected by vibration, impact and alternating loads, at this time, the local plastic deformation of part of the surface material will continue to occur, which will lead to a decrease in the preload force (called initial loosening) and the value will decrease. Small, the mother can easily loosen and turn.
Because the latch thread sleeve is made of stainless steel, it has high hardness, which increases the service life of the softer base parts by tens to hundreds of times; increases its strength and avoids tripping and random buckling.
