What is a double headed bolt

Double headed bolts generally require surface treatment, and there are many types of surface treatment for bolts, including electroplating, blackening, oxidation, phosphating, and non electrolytic zinc sheet coating treatment. 

However, the national standard GB901 double head bolt factory's home appliance plated fasteners account for a large proportion in the actual use of fasteners. Especially widely used in industries and fields such as automobiles, tractors, household appliances, instrumentation, aerospace, and communication.

However, for threaded fasteners, it is not only necessary to have a certain anti-corrosion ability during use, but also to ensure the interchangeability of threads, which can be referred to as screw fit here. It is necessary to establish specialized electroplating layer standards in order to simultaneously meet the dual performance requirements of anti-corrosion and interchangeability for threaded fasteners during use. The GB/T5267.1-2002 [Electroplated Coatings on Thread Fasteners] standard is one of the series of national standards for "Surface Treatment of Fasteners", which includes: GB/T5267.1-2002 [Electroplated Coatings on Fasteners]; GB/T5267.2-2002 [Non electrolytic zinc sheet coating for fasteners] two standards. The national standard for 35CrMoa double head bolts is equivalent to the international standard ISO4042; 1999 [Electroplated coatings on threaded fasteners].

This standard replaces the GB/T5267-1985 standard for electroplated coatings on threaded fasteners.The characteristics of double headed bolts are that they are commonly used on large equipment and are suitable for large machinery and accessories to be installed, such as mirrors, mechanical seal seats, reduction frames, etc. Double headed bolts are easy to install, just screw one end into the main body. The high-strength double headed bolts have the specified size and then install the accessories.

Finally, screw the nut onto the other end to complete the installation. Double headed bolts are easy to replace, of excellent quality, and rarely experience wear or damage, allowing for free disassembly.During each repair, it is necessary to inspect the newly replaced double headed bolts and other newly replaced accessories, with a focus on the head and guide parts of the double headed bolts. It is also necessary to strictly inspect each part of the thread for cracks or dents, and check the tooth shape of the double headed bolts for any changes. Is there any abnormality in the pitch? If there is any abnormality, it must not be used again. American standard double head bolt manufacturers should use a torque wrench as a tool when installing connecting rod caps. It is necessary to tighten according to the prescribed standards, and the torque should not be too large or too small. It is also important to choose matching double head bolts and double head studs from manufacturers.