Stainless Countersunk Screws
Stainless countersunk screws are a construction part. The head is a 90-degree cone with a tool tightening slot in the head.
Countersunk head screws are screws that, when tightened, the head is not higher than the plane into which it is driven, enabling the surface to remain flat and beautiful.
These screws have different slots such as one slot, cross slot, plum blossom slot, etc., and the slots should be extended to the centre of the screws, so that chips can effectively avoid blocking the slots.
Depending on different roles and different tail ends, generally divided into stainless steel countersunk head machine screws and stainless steel countersunk head tapping screws
Different Driver for Stainless Countersunk Screws
Socket Screws
Phillips Cross Screws
Phillips Cross Tapping Screws
Stainless Countersunk Screws Installation Guide
SS 304 or SS316 stainless countersunk screws are mostly used in the need to install after the surface of the parts can not have a raised place, the fastening of the parts and there are two kinds of thick and thin, the so-called thick, that is to say, the thickness of the parts to be fastened is greater than the thickness of the head of the stainless steel countersunk head screws, stainless steel screws on the tightening of the screws, there is still a portion of the threads of the screws did not enter the threaded holes, in this case, the countersunk head screws can certainly be tightened.
There is usually a situation where the thickness of the part being fastened is less than the height of the head of the stainless steel countersunk head screws, which are commonly found in sheet metal parts in machinery and equipment, such as hinges of the chassis with the door and the box of the link; the sheet metal cover of the equipment with the linkage of the equipment and so on.
Due to the small thickness of the part, the hole through which the stainless steel screw passes on the sheet metal part being fastened is completely tapered, and when the stainless steel countersunk head screw is tightened, the head of the screw is not pressed against the sheet metal part with a tapered surface.
The bottom of the root of the screw head is squeezed dead against the top of the threaded hole, and although it feels like the screw is tightened, the sheet metal part is stuck rather than pressed, in which case the sheet metal part is in fact really not tightened. This is a very common situation.
A2 or A4 stainless countersunk screws head vertebrae is 90 ° cone angle, usually the top angle of the newly purchased drill 118 ° – 120 °, some lack of training of workers do not know the angle difference, often directly with 120 ° of the drill reaming, which results in the countersunk head screw tightening is not the head of the conical surface of the force, but the bottom of the screw head of a line of force, which is also known as countersunk screws can not be tightened for one of the reasons that it is not a problem of the quality of the screws.
Phillips Cross Screws DIN965 Size Chart
Hexagon Socket Cap Screws DIN7991 Size Chart
Tapping Screws DIN7982 Size Chart
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