Type name of each part of the fastener:
Type: 1 plate type: slot (grooved), cross slot, one / cross slot, inner hexagon, hexagonal pattern, triangle, H type, etc.
The type of plate screwing is determined by the loading and unloading tool. The screw-type type of the screw is called based on the type of the tool. Commonly used tools are: a flat-blade screwdriver, a Phillips screwdriver, a hexagonal wrench, and a live (stay) wrench. Zhejiang area likes to say that the word slot is slotted. We have a slotted slot, and they all call it a slotted fix. This is just a different reading method. The Guangdong area is called a machine meter. . Both the triangle and the H-type are the head type of the anti-theft screw. It is called the anti-theft screw because the wrench that is matched with it is not available on the market.
2 head type: cylindrical head, semi-recessed head (O), countersunk head (K), spherical cylindrical head, small disc head (P), semi-circular head (R), hexagonal head, knurled head, headless, T-shaped head , large flat head (T), large pan head (B), flat round head, square head and so on. (The code in the brackets is JIS standard) The type of the head is determined based on the installation requirements, the position and the plate screw type. The hexagonal cylinder head, the semi-recessed head and the countersunk head screw are used for the part where the head cannot expose the surface of the product, so the head The requirements for dimensions and prefabricated holes are high, while the heads such as pan heads, semicircular heads, and hex heads are basically exposed on the surface of the product, and only the appearance is required, but the size is not high.
End face type: flange face, flange (with meson--W)
Thick rod (conventional), thin rod (actually blank before threading, size = d-0.65p), DIN931 (hexagonal half-bolt) is a typical thick rod half-screw, which is thicker than fine in machining The rod is difficult to machine. For example, if the diameter is M5, the diameter of the rod is 4.9 mm, and the strength of the thick rod is higher than the strength of the thin rod.
Fine teeth, coarse teeth (conventional) and semi-threads are divided into full thread and thread rotation. The speed of fine teeth is slow, the coarse teeth are screwed in fast, the internal thread of coarse teeth is more suitable, and the outer diameter of coarse teeth is large. The clearance of the coarse teeth is larger than that of the fine teeth.
Dimensions of full and half threads:
Tail type: set screws: cone end, chamfer end, flat end, concave end, spherical end, cylindrical end (as shown below)
Self-tapping screws: cone end--C type (spike--A), flat end--F type (flat foot--B), bracketed end (foot--T), round end--R type Self-drilling end
Tail mark comparison table:
High Mast Lights,High Mast Lights Pole,High Mast Light
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