In case of the Heads one of the most important parameters is the minimal tolerance of the thickness. In case the order refers to standardized Heads ( i.e. DIN 28011, DIN 28013, etc.) means that the minimum thickness is determined by the standard.
Further sizes which are generally determined by tolerancies:

• height

• circumference measured on the edge

• ovality and conicity of the cylindrical part

In case of non-standardized products these tolerances should be given when the order is placed. Also an agreement is needed in case of special surface requirements or of eventual quantity limitation.

Heat treatment technology of the Heads are determined according to the regulation of the production code applied ( i.e. AD 2000 Merkblatt HP7) or formed by the customer's demand. The aim of the heat treatment procedures is generally to restore or normalize the contexture which has formerly been hardened during the cold-forming process.
The embordering sizes of our furnaces make us possible to get through with post- heat treatmet at  almoust all of the articles produced. Nevertheless a number of test results confirm and the quality controll system applied guarantees that the pressing technology results proper normalized condition and thus the the post-heat treatment is not necessary.

The edges of the Heads should be prepared due to the welding process required to be applied. The way of edge-preparation should be fixed upon receipt of the order. Thereto we normally use the markings of the point 2.2 of the standards DIN 28011 and DIN 28013 ( Editions of January 1993). The most frequent ways of edge executions are:

• rough (code R)

• plain (code I)

• V-edge outside 30°(code VA)

Of course it is also possible to place orders for non-series edge-preparations. Joggled edge is a frequently used edge execution at the  heads with/under thickness 10 mm which is very advantageous due to its fast assembling feature mainly at the heads are to be produced in quantity.

All the requirements to the surface of the Heads should be fixed upon receipt of the purchase order. For lack of any requirements the surfcace is to be considered as untreated (raw). For sand blasting there are two technologies at our disposal:

• technology of rolling - scattering on block-chain run

• technology of scattering room with free spout - scattering

In case of surface requirements incrased we complete burnishing. Picling and then passivating are the proper surface treatments of  the products are made of stainless steel.