Supply high-strength square head bolts, grade 10.9 blackened square head bolts, square head bolts

"(+): Cross slot (-): Straight slot (T): Chrysanthemum slot (H): Hexagonal socket (PZ): Miter slot
(+-):+- groove (Y): Y-groove (H): H-groove (L): backstop tooth (WIS): single movable spring washer
(WIF): Single movable flat washer (WIT): Single movable outer toothed washer (W2SF): Double movable flat spring washer
(W=6mm): washer outer diameter equal to 6mm (SUS): stainless steel (Cu): brass (Br): red copper (8.8): 8.8 grade screw (10.9): 10.9 grade screw (12.9): 12.9 grade screw (R): other notes"

The purpose of stainless steel screw wires: The hardness difference of stainless steel screw wires leads to their different uses. They are generally used as small screws in daily life, as well as for car screws and compression screws. They are widely used in normal life. Stainless steel screw wire: In terms of appearance, screw wire is generally divided into fog surface spring wire and bright surface screw wire. The hardness of fog surface screw wire is higher than that of bright surface screw wire, and it can be used as a hanging wire. It is generally used on products with low appearance requirements but high elasticity requirements. Production equipment for papermaking, oxalic acid, fertilizers, etc; Photography, food industry, coastal facilities, ropes, CD poles, bolts, nuts.

"Plain thread
Ordinary coarse thread: feature code M+nominal diameter+rotation direction+thread tolerance zone code (pitch diameter, top diameter) - rotation length
Ordinary fine pitch thread: feature code M+nominal diameter * pitch+direction of rotation+thread tolerance zone code (pitch diameter, top diameter) - turning length
Right-handed threads are omitted and left handed threads are indicated by "LH".
M 16-5g6g represents coarse pitch regular threads, with a nominal diameter of 16 and a right-hand thread. The thread tolerance zone has a pitch diameter of 5g and a major diameter of 6g, and the screwing length is considered to be of medium length.
M16 × 1 LH-6G represents fine pitch ordinary thread, with a nominal diameter of 16 and a pitch of 1. It is left handed and has a tolerance zone of 6G for both pitch and major diameters. The thread engagement length is considered to be of medium length.
The annotation format is: feature code (represented by G for cylindrical pipe threads and NPT for conical pipe threads)+size code+tolerance level code+rotation direction
G1A - LH represents British non threaded sealing pipe threads, with a size code of 1 inch, left-hand rotation, and a tolerance level of A.
Rcl/2 represents British thread sealing cone pipe thread, size code 1/2in, right handed"

During mold manufacturing, it is necessary to install many positioning pins to fix them in the relative position between two parts. The positioning pins are usually sunk into the positioning pin holes on the mold. Due to the need to frequently pull out the positioning pins during mold assembly to disassemble and correct the parts, and at the same time, during mold maintenance, it is also necessary to pull out the positioning pins to remove the damaged parts for repair. Therefore, the workload of pulling out the pins is relatively large, The existing methods are: 1) When installing the pin, the operator uses a self-made long screw that matches the threaded hole of the pin to screw it into the pin, and then aligns it with the pin hole to hit the screw with a hammer to make it snap in. Then, the screw is taken out by hand. The shortcomings are: on the one hand, hitting the screw with a hammer can easily cause damage or deformation of the screw, making it unable to be used normally, and on the other hand, manually screwing out the screw is labor-intensive and may not be able to be taken out; 2) When pulling out the pin, the operator screws the screw into the pin and directly uses hands or pliers to forcefully pull out the screw. A few companies use large pin pullers to pull out the pin, but the disadvantage is that using hands or pliers to pull out is too labor-intensive and time-consuming. Even if a large pin puller is used, due to its large weight, it is not convenient to use.

Self locking nuts generally rely on friction, and their principle is to press the embossed teeth into the preset holes of the sheet metal. Generally, the hole diameter of the square preset hole is slightly smaller than that of the rivet nut. Connect the nut to the locking mechanism. When tightening the nut, the locking mechanism locks the ruler body and the ruler frame cannot move freely, achieving the purpose of locking; When loosening the nut, the locking mechanism disengages the ruler body and the ruler frame moves along the ruler body