Custom internal expansion screw cross pan head internal expansion bolt round head pull explosion screw 3/4 1/4-20

We have more than ten years of production experience in the screw industry. The main products are: anti-thread cup head screws, plum blossom countersunk head screws, knurled countersunk head vertical grain rivet nuts, furniture hardware nuts, German standard gaskets, carbon steel zinc nickel screws, Flange cross bolts, hexagon socket set screws, 4.8 grade spring washers, double inner teeth of casing, all metal lock nuts, handle nut screws, carbon steel 8.8 grade screws, thickened hexagon nuts, high-strength socket head screws and nuts etc. Firmware, due to different product materials and specifications, the price is also different, please contact us if necessary.

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Product introduction

Screw Specifications

Screw head table

The product structure in the known technology includes a T-shaped bolt with a longitudinal section, and a polygonal nut matched with the bolt. The bolt is divided into two parts: the screw and the screw head. The screw head is placed at one end of the screw to form an integral part. The radial length of the tightening surface of the screw head is greater than the radial length of the screw, and its axial length is less than the axial length of the screw; The solid surface is a polygon, and now a hexagon is commonly used. The periphery of the base of the nut and the screw head has a number of elastic surfaces corresponding to the polygon; the periphery of the axial screw is provided with an external thread matching the internal thread of the nut. In actual use, the fastener of this structure can be tightened by using a conventional screw, such as a wrench. Therefore, its anti-theft performance is poor and it is not suitable for occasions with special requirements.

Custom Internal Expansion Screws

T-bolts are often used in conjunction with flange nuts, which are standard supporting connectors when installing corner fittings, and can be automatically positioned and locked during the installation process. At present, in the welding process of T-bolts, there is often a method of manual welding. Using such a method, the manufacturing cycle is long, the labor intensity is high, the production efficiency is low, and the welding quality is difficult to guarantee.

Cross pan head inner expansion bolt

Round head pull explosion screw

rivet is a nail-shaped object used to join two parts or components with a through hole and a cap on one end. In riveting, the riveted parts are connected by their own deformation or interference. There are many types of rivets, and they are informal, commonly used are R-type rivets, fan rivets, blind rivets, blind rivets, tree rivets, semi-circular head, flat head, semi-hollow rivets, solid rivets, countersunk head rivets, blind rivets, hollow rivets Rivets, these usually use their own deformation to connect the riveted parts. Generally less than 8 mm with cold riveting, larger than this size with hot riveting. But there are exceptions. For example, the nameplate on some locks is riveted by the interference between the rivet and the lock body hole.


The process factors that affect the quality of high-strength fasteners include steel design, spheroidizing annealing, peeling and dephosphorization, drawing, cold heading, thread processing, heat treatment, etc., and sometimes the superposition of various factors.


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