Stud, also named double-headed screw . Used to connect the fixed link function of machinery, double-headed bolts have threads at both ends, the middle of the screw, types of thick and thin. Generally used mining machinery, bridges, automobiles, motorcycles, boiler steel structures, suspension towers, long-span steel structures and large buildings.
Thread specification d = M12, nominal length L = 80mm, performance grade 4.8. Long double-headed bolt complete marking: GB 901 M12 *80-4.8
Use of double head bolts
1.Used in large-scale equipment which need to install accessories, such as mirror, mechanical seal seat, reducer frame, etc. At this time, a double-headed bolt is used, one end is screwed into the main body, after the attachment is installed, the other end is equipped with nuts.Because the attachment is often disassembled, the thread will be worn or damaged, so it will be very convenient to replace the double-headed bolt. 2. When the thickness of the connecting body is very large and the bolt length is very long, the double-head bolt will be used. 3. Used to connect thick slabs and places can’t be used hexagonal bolts, such as concrete roof trusses, single-track beam suspensions of roof beams, etc.
Surface Treatment of Double Head Bolts
Double Head Bolts usually need surface treatment. There are many kinds of surface treatment of bolts, such as electroplating, blackening, oxidation, phosphating, coating treatment of non-electrolytic zinc sheet, etc. However, in the actual use of fasteners,electroplated fasteners occupy a large proportion . Especially in automobiles, tractors, household appliances, instruments, aerospace, communications and other industries and fields are more widely used.