17-4-3-bolty-s-vnutrennim-shestigrannikom-ili-mnogogrannojj-golovkojj.html
17.4.3. Bolts with an internal hexagon or a many-sided headFor a reversing of such bolts clear their internal opening in a head and use the corresponding key. Best of all a set of keys with a six-sided profile or multigear keys will be suitable for this purpose. Before a bolt reversing carefully not to damage a head, tap it the hammer – it can facilitate a bolt reversing.
|