Set screw is also called head screw and positioning screw. The utility model is a screw specially used for fixing the relative position of machine parts. Type: square flange end set Bolt, GB / t821-1988 square chamfered end set screw, GB / t85-1988 square long cylindrical end set screw, inner square head set screw, etc.
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The selection of common set Screws is generally used to fix the relative position of two parts with little force. The axial and circumferential positioning of common sleeve like parts on the shaft. There are many kinds of set screws. The common ones are as follows: according to the end part, there are conical end, flat end, concave end, oblong cylinder head, etc; Set Screws,Allen Nose Set Screw,Slotted Head Set Screw,Hexagon Socket Grub Screw Suzhou Gubao Screws Co.,Ltd. , https://www.hongyiscrew.com
Hexagon socket set screw, hexagon flat set screw, hexagon cylindrical set screw.
According to the head part: slotted, hexagon socket, square head, etc. Tapered end screws and concave end screws with sharp ends can be used to directly top the parts, and the concave end is more reliable and can bear greater force; Taper end screws without sharp points must be drilled in the parts. The flat end is used to top the tight plane, which does not damage the parts, but bears limited load.
Slotted screws have small tightening force and are often easy to screw off. Generally, they prefer hexagon socket head; The tightening force of square head is the largest, but it can not be embedded in parts, and its use is limited. In order to prevent loosening and withdrawal of threaded parts, a set screw can be drilled at the cross seam. The long cylindrical head screw at the top end is used in the keyway of the shaft to lock and prevent circumferential rotation. It can also be used in general unimportant occasions when the key slides in the keyway of the shaft.
AMT Review (1-19)
Amalgamated Metal Trading Limited (AMT), a leading brokerage of the London Metal Exchange (LME), issued a daily commentary on the base metals of LME on the 19th. Copper: The selling pressure is heavy at $3050, and it is expected to maintain the oscillation trend in the short-term. Aluminium: There is a strong resistance at $1,860. It is expected that the short-term trend will be dominated by oscillations. Lead: All-day trading is light, short-term supply concerns have been basically eliminated, the future trend is not clear, and wait and see. Zinc: Driven by technical buying and setting a new high in seven years, attention should be paid to short-term risks. Tin: It was boosted by the shortage of market supply, but the short-term trend was uncertain and we kept watching. Nickel: Close to 14,500 US dollars against the market outlook.