This combination is consistent with the essence of modernization, which want to offer such a famous fixture as a screw. It is clear to everyone that it holds better than a nail, but it requires more effort and time for screwing. If it is to drive with a hammer, the material is crushed, it does not form a threaded groove. My screw (1) with longitudinal grooves on the threaded part, produced by forcing through a die (2). It is possible to drive a nail. You only need a little then turn the bolt with a screwdriver: the remaining part of the coils will cut into the material and will hold securely.
C. CUTTINGS, Leningrad
Recommend to read
OCEAN PATROL
It is well known that warships is not only a means of waging war at sea. And in peacetime the Navy has to solve a wide range of tasks — carry out protection of territorial waters to...
NO WORSE THAN DIAMOND
The glass cutters with carbide rollers are widely used by home craftsmen. But those who work with glass often still prefer the diamond. And it's not just more sharpness and hardness of...
