Shenzhen Shi Shi Tong Metal Products Co., Ltd

  Stainless steel phillips flat head screw why can go wrong? Sometimes, the customer said that he needed to customize the  stainless steel  phillips  flat head screw . After quoting the price to the customer, the customer thought that he could accept the price, so he paid the money. When the drawing was issued for confirmation, the customer said that the shape was not what he wanted. Why is the drawing given by the screw manufacturer to the customer wrong? If the customer does not clearly give the shape of the  stainless steel  phillips  flat head screw , the head of the screw has two shapes, one is the shape of countersunk head, countersunk head can also be called flat head. One is shaped like a pancake, also known as a crepe. Therefore, when the customer says the head shape he needs is a crew cut, the customer service or business needs to confirm with the customer what shape he says the crew cut is, otherwise the communication between two people will...

  Production of black countersunk self tapping screws or such manufacturers worry-free Mr. Li is being an electronic product company. Last year, he found a screw manufacturer near his company to make  black countersunk  self tapping screws . There was no big problem when it was just starting to supply. However, after the screw has been used for a while, it will basically rust. Mr. Li has responded to this issue several times with this manufacturer. They also assured Mr. Li that this problem will not occur again when the  black countersunk self tapping screws  are used for the next time. After the next delivery, there was no such problem, but a new problem appeared, that is, some of the screws were eccentric.   Mr. Li and the manufacturer indicated that they would like to have a full inspection of the manufacturer and provide a material report. Mr. Li thinks that he has said this to the manufacturer, and there will be no problem when the next supply. As a re...

Why is the nylok patch point of the m4 brass countersunk machine screws in this place? : Mr. Han put the drawings of the m4 brass countersunk machine screws and asked if we could produce according to his drawings

stainless steel countersunk screws  are also called stainless steel flat head screws. Although the name is different, the meaning is the same. If it is made of carbon steel, there will be 4.8, 8.8, 10.9, and 12.9. However, stainless steel is only 4.8. Some stainless steel countersunk screws require 201 grades, and some have 304 grades and 316 grades. Before producing  stainless steel countersunk screws , it is necessary to see what production process is used for this screw. The production process mainly includes cold rolling and turning. The models used in cold heading are also different. If the stainless steel countersunk head screw is not so complicated, such as the ISO 2009 countersunk slotted machine screw, then it can be produced with a single-die machine. If there is a requirement for a slot, the slot is usually cut out. It’s not cold. In the case of GB 10-1976 countersunk horse-drawn carriage screws, such screws are generally produced in multiple stations. Of cour...

In the carburizing process of countersunk self tapping screws , the deep carburizing process is different. For workpieces with a carburized layer depth greater than 1.0 mm, such as automobile gears, the carburized layer depth and the carbon concentration distribution of the layer, even the layer The depth of the over-eutectoid layer and the eutectoid layer may have certain requirements. In order to ensure a high carburization rate, such parts are often diffused using an atmosphere having a carbon potential of 0.7% C-0.8% C after high carbon potential carburization. In order to reduce the distortion caused by direct quenching after carburizing and reduce the martensite and retained austenite grade, the process of furnace cooling to 820-860 ° C isothermal and then quenching is required after the end of the diffusion phase to ensure that the layer and the core are Qualified hardness and good microstructure. The requirements for carrier gas and rich gas in this carburizing process are diff...