TEST 12.9 grade segment bolt and nut

HESEN machine engineering co, Ltd , founded in 1990, is located in Zimao Industrial Park of Quanzhou City, Fujian Province---the famous well-developed area. It is a company which engages in professional design, development, production and sale. Our main products are construction machinery Chassis Parts, cars parts and all kinds of high strengthen bolts. Our products obtain good markets at home and abroad.

Since founded, HESEN has always been adhering to the management idea of “high quality, good service” and it owns perfect quality guarantee system. It has built its unique ways of management and Research Development and Production, and has also Through ISO9001:2000 international quality management system certification.

Our tenet is " quality foremost, customer first and credit worthy". While paying attention to practice and exploration, we constantly strive to product innovation and service innovation toprovide first-class products and first-class service for customers from home and abroad. And we also supply OEM service.

Exporting countries

Production Process

We use heat treatment technology and CNC fine processing production, to ensure that products are excellent quality and dimension accuracy and use blue and phos- phating surface burning to ensure good appearance, surface rust free.

High quality material

Our company buys steel from large iron and steel group steel, such as Shanghai baoshan iron and steel, Beijing shougang group, Hangzhou iron and steel. The steel has not only good mechanical properties, but also chemical stability, which ensures the high quality of our products.

Crack resistance

After heat treatment of the product, we will carry on the medium frequency induction, quenching their surface and the inner, to ensure the strength of internal and external hardness.

Quality control system

We have established a comprehensive quality control system in place to ensure that the whole process from the purchase of raw materials to final packaging are under strict quality control. Cooperating with high-tech testing instruments, such as hardness tester, spectrometer, metallographic microscope, determines the excellent quality and appearance of our products.

To you in the hand of the products must pass

the following process.