Made from 10B21 for surface in plain and or zinc plated is available.
For different shapes available like flange type slab base, with weld nibs, with projections under flange or on top of the head, with serrations, oval hole. In general, Nut shape depend on what type of bolt.
All items are manufactured according to DIN, ISO or any other standard. Complying with the ISO 898-1, ISO 898-2. In addition to the specifications agreed with the clients.