Indispensable screws, and create a better future - Heng Xin Jie. Xiamen Xin Heng Jie Hardware Products Co., Ltd. is specialized in the production of screws, bolts, rivets stairs, the combination screws, pins, shafts and non-standard screws, springs, metal stampings. Heng Xin Jie committed stepped screw design, development, production and sales, in order to meet customer demand by introducing four-mode four more power-cold heading machine, fifty five die molding machine, combination washer screw machines. Related testing are: three-dimensional optical detector, hardness, salt spray tester machines. Heng Xin Jie spirit of quality first, integrity and pragmatic spirit, with the development, and create a win-win, as always, adhere to market-oriented and enhance service for the purpose, the majority of customers the same trusted partner. Standard is the norm, and each country has its own standards department. Our most commonly used in the usual standard business are the following: GB- China National Standard (GB) ANSI- American National Standard (ANSI); DIN- German national standard (DIN) ASME- American Society of Mechanical Engineers Standard ; JIS- Japanese National Standards (JIS) BSW- British Standard; GB- national standard is one of the many standards, in addition to industry standards, professional standards and departmental standards. National standard is divided: GB (mandatory standards) and GB / T (recommended standards) and GBn (national internal standard). We normally see as GB30, GB5783, etc. are mandatory standards. Several more standard except for some basic dimensions as on the side of the head, the head of a different thickness, the most important part of a different thread. GB, DIN, JIS and so there is a thread MM (mm) as a unit, collectively known as the metric thread. Another like ANSI, ASME and other threads are in inches called American standard thread. In addition to the metric thread there is a thread and US BSW- British standards, the thread is in inches, commonly known as Whitworth. In the usual domestic business, we are the most frequently encountered are the standard GB (GB) and DIN (German standard). In raw products, mainly be exposed to the following criteria: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; DIN931 and so on. GB30 (Old GB) has been replaced by a standard book GB5783 (new national standard). GB52 (Old GB) has been replaced by a standard book GB6170 (new national standard).