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The railway is one of the most important inventions and means of transportation of mankind. For centuries, mankind has continued to innovate its technology, and the technology of railways and locomotives has not yet reached its peak.

Today, railways around the world have more transport responsibilities than ever before, and the demands placed on locomotive manufacturers and their suppliers are constantly changing. Shorter product cycles and technological innovation, the use of newer, more advanced, lighter, more energy-saving and environmentally friendly materials, and even the ever-changing division of labor require continuous innovation and adaptation.

Wire thread ynfoegje, self-tapping thread insert and key locking insert are widely used in railways and locomotives as new and innovative fastening technologies. Spesjale snelwegen ûntwikkelje yn ús lân benammen hurd, en hege snelheid EMU's operearje yn grutte oantallen op alle grutte spoarlinen yn it heule lân en eksporteare nei ferskate lannen. Aluminiumlegering is it haadmateriaal wurden fan lokomotyfienheden fanwegen syn lichtgewicht en goede sealing eigenskippen. Lykwols, de sêfte aard fan aluminium alloy materialen resultearret yn swak skuorresistinsje yn threaded ferbinings. Direkte ferwurking fan triedden op it basismateriaal kin net foldwaan oan 'e feiligenseasken fan gearstalling en operaasje fan spoarwein. Aluminiumlegeringen fereaskje it gebrûk fan triedskeden om de stabiliteit en betrouberens fan 'e ferbining te garandearjen.

Yn ferskate soarten ynlânske EMU's, threaded sheaths wurde brûkt yn ferskate threaded ferbining struktueren lykas auto ynterieur, exterior suspensions, and under-car hoisting. The main types include wire thread inserts, selstapping thread ynfoegings, and key locking thread inserts. The CRH1 EMU has a stainless steel body and does not require the use of threaded sheaths; the CRH2 EMU mainly uses steel wire threaded inserts; the CRH3 EMU mainly uses self-tapping threaded inserts, and is also used in some large-diameter pipe connections. Wire thread inserts are used in parts; key locking thread inserts are used in CRH5 EMUs.