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Screw with a semicircular head GOST 1144-80
Screw GOST 1144-80 with a semi-circular head, equipped with a slot, made of steel 3.6 strength class. The metal rod of a part with a fine thread pitch can be 1.6–10 mm in diameter.
Screw with semi-countersunk head GOST 1146-80
A screw with a head of a semi-countersunk type GOST 1146–80 of the B-accuracy class is made of hardened steel. The diameter of the metal rod of the part is 1.6–10 mm.
Screw with countersunk head GOST 1145-80
Screw GOST 1145-80 - a detail with a countersunk head on one side and a metal rod with a full thread on the other. The head has a cross slot. The hardware is made of hardened stainless or carbon steel of accuracy classes A and B.
Impact screw for quick installation dowel
The plant "Kalibr" launched the production of screws - fasteners in the form of a metal rod with a head. The head is equipped with a slot - straight or cruciform. The hardware rod consists of a smooth part (closer to the head) and an external thread (closer to the end), and the diameter of both parts is the same. The task of the screw thread is to form an internal thread in the parts to be joined.The scope of screws is quite wide - hardware is widely used in everyday life and furniture production, in installation and construction work. The choice of a part is determined primarily by the base material, for each of which screws are produced with the necessary thread and head shape: semicircular and round, countersunk and semi- countersunk, hexagonal and square.Screws are designed exclusively for screwing into soft bases: as a rule, wood or plastic. In this case, the hole for the fastener may either not be drilled at all, or it may be drilled with a diameter of about 70% of the diameter of the screw thread. It should be borne in mind that a thread cut with a screw in a soft material, unlike screw connections, can withstand a small number of repeated twists (1 - 100), especially in cases where the material is thin enough.