Hangzhou Tongna hardware Manufacture Co.Ltd. is a professional manufacturer in design ,producing , marketing ,GB ,ANSI ,ISO ,DIN ,JIS ,BS ,or customer specified requirements of high precision fasteners.

Since established ,Essence has received worldwide support ,and we have owned a heat treatment production line and a set of automatic environment plating production line equipment ,our monthly production reaches 80 million pieces .We have more than 10 applications engineers and 20 production technical engineers .We have passed ISO9001,ISO14001 system certification .Our products are widely used in electronic communications ,high-end home appliance ,automobile and other related industries ,and have gained customers’ trusts and praise.

The main products are screw ,bolts ,product specifications of diameter 0.8mm-10mm ,length 1.5mm-150mm,the mechanical strength rating of CLASS-4.8 ,6.8 ,8.8 ,9.8 ,10.9 ,12.9 of the fasteners ,as well as a variety of shapes within a diameter of 20mm and accuracy of the self-clinching series fasteners ,at the same time with a variety of standard and non-standard nuts and washers.