Countersunk internal angle bolts are also called countersunk screws and flat machine screws. They are a kind of construction parts. The head is a 90-degree cone, which is similar to a common wood screw. The head has a tool-tightening groove, such as a font, cross, hexagon, quincunx, pentagon, etc.
Size:M3-M24
Surface：Zp/BLACK
d | M3 | M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 |
P | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 |
α | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 60 | 60 |
b | 12 | 14 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 42 | 46 | 50 | 54 |
/ | / | / | 24 | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | |
/ | / | / | / | / | 45 | 49 | 53 | 57 | 61 | 65 | 69 | 73 | |
dk | 6 | 8 | 10 | 12 | 16 | 20 | 24 | 27 | 30 | 33 | 36 | 36 | 39 |
5.7 | 7.64 | 9.64 | 11.57 | 15.57 | 19.48 | 23.48 | 26.48 | 29.48 | 32.38 | 35.38 | 35.38 | 38.38 | |
ds | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
2.86 | 3.82 | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 17.73 | 19.67 | 21.67 | 23.67 | |
e | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 11.43 | 13.72 | 13.72 | 16 | 16 |
k | 1.7 | 2.3 | 2.8 | 3.3 | 4.4 | 5.5 | 6.5 | 7 | 7.5 | 8 | 8.5 | 13.1 | 14 |
s | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 10 | 12 | 12 | 14 | 14 |
2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 | 10.025 | 12.032 | 12.032 | 14.032 | 14.032 | |
2.1 | 2.6 | 3.1 | 4.12 | 5.14 | 6.14 | 8.175 | 10.175 | 10.175 | 12.212 | 12.212 | 14.212 | 14.212 | |
t | 1.2 | 1.8 | 2.3 | 2.5 | 3.5 | 4.4 | 4.6 | 4.8 | 5.3 | 5.5 | 5.9 | 8.8 | 10.3 |
0.95 | 1.55 | 2.05 | 2.25 | 3.2 | 4.1 | 4.3 | 4.5 | 5 | 5.2 | 5.6 | 8.44 | 9.87 |
Effect:
On the surface of the mounting hole on the connecting piece, a 90-degree conical round socket is machined, and the head of the flat machine screw is in the round socket and is flush with the surface of the connecting piece. Flat machine screws are also used in some occasions with half-round head flat machine screws. This kind of screw is more beautiful and is used in places where the surface can allow a little protrusion. Screws play the role of connecting two or more objects and are an indispensable necessity in daily life or industrial manufacturing.
Instructions:
The countersunk head screws are mostly used after installation, the surface of the parts can not be raised, and the fastened parts have two thicknesses, the so-called thick, which means that the thickness of the fastened part is greater than the thickness of the head of the countersunk screw After the screw is tightened, there is still a part of the screw thread that does not enter the threaded hole. In this case, the countersunk screw can definitely be tightened. There is usually another situation, that is, the thickness of the fastened parts is less than the height of the head of the countersunk screw, which is common in sheet metal parts in mechanical equipment, such as the connection of the hinge of the chassis, the door and the box; the sheet metal of the equipment Connection of cover and equipment, etc. Due to the small thickness of the part, the screw through hole of the fastened sheet metal part is completely a conical hole. In this case, when the countersunk screw is tightened, the screw head is not a conical surface to compress the sheet metal part , But the bottom of the screw head and the top of the threaded hole are squeezed. Although the screw feels that the screw is tightened, the sheet metal part is stuck instead of being pressed. In this case, although the screw feels that the screw is tightened, the sheet metal The gold piece is indeed not tightened. This is a very common situation.
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