Anchor bolt
The so-called hook and hammer head screws , which are used for fastening to anchor rails or mounting rails, are often referred to as anchor bolts . Other forms are crutch anchors, hammer bolts (for example according to DIN 7992 or DIN 261 ), which are also used in larger dimensions, and plate anchors, which are directly embedded in concrete.
Hook-head screws have two hooks with which the screws hang into the profile legs of the anchor or mounting rails after turning 90 ° to the right.
T-head bolts work on the same principle. The head, however, is shaped like a hammer . Even the hammer head screws cannot turn back after they have been inserted, turned 90 ° and tightened in the rail slot, as they are provided with a square under the head.
According to the names of the three largest competitors, these screws also be in this market Half screws (HS), Jordahlschrauben (J) and Steelline screws (SL) called.
literature
- P. Gerlach (eds.), M. Coenen, E. Lupberger, A. Schmidt, G. Unold, Fr. Wicke, C. Zietemann: Freytag's auxiliary book for mechanical engineering. eighth edition, published by Julius Springer, Berlin 1930.
- Rolf Kindmann, Michael Stracke: Connections in steel and composite construction. Verlag Ernst & Sohn, Berlin 2012, ISBN 978-3-433-03020-2 .