Technical Structure Of Fastener Thread
There are four common process structures of fastener thread, which are chamfer, washout thread, tool withdrawal groove, and bit Angle. As a professional fastener manufacturer, Xinchi Fastener Company is pleased to share the specific content about the process structure of these threads based on the knowledge and understanding of fastener threads.
In order to facilitate the assembly of internal and external thread and prevent the end of the bruise, the end of the thread is generally with chamfering. The chamfer is generally 45° and its size is specified by the standard.
When cutting the thread, the last few teeth are incomplete and cannot be used due to the influence of the tool exit or the structure of the thread tool. This incomplete thread is called the washout thread(l).
Tool withdrawal groove
Sometimes, in order to avoid a screw tail and facilitate assembly and machining, a tool withdrawal groove is made at the end of the thread.
For undrilled small-diameter threaded holes (also called blind threaded holes), the normal manufacturing process is to drill the holes with a drill bit and tap the thread into the inner wall of the holes. Since the bit Angle is 118°, it is simplified to 120° for drawing. When tapping, it is impossible to tap the bottom of the hole with tap tapping, so it is not possible to make the depth of the hole full thread.
Xinchi Fastener Company is a trustworthy fastener company, especially in furniture nuts. And we are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier, Xinchi Fastener Company can offer a wide range of high-quality fasteners, including tee nuts, screws, bolts, rivets, washers, etc. If you want to know more about fasteners or want to wholesale fasteners, please feel free to contact us. And then our experienced and expert service team will reply to you as soon as possible.