Brief glossary of door terminology


a: Door element 

The door element consists of the door, or more exactly the door leaf and the frame, and the door casement. Door elements come as rotating wing or sliding doors, one- and two-winged, lintel- or storey-height and naturally also in special sizes.


b: Door leaf

Interior door leaves in wood materials are approx. 40 mm thick and are supplied in folded and stub  (flush-fitting) versions, and at Köhnlein with
tubular chipboard strips and tubular chipboard inserts. In addition to other factors, these inserts provide improved stability (reduced tendency to warp) and increased ease of movement of the door leaf.

In case of door leaves subject to other requirements, such as  break-in, fire, smoke protection and noise insulation, the door leaf thickness is increased, and specially developed central layers are used. These doors, together with the frame, are tested for compliance with the requirements by independent testing institutes, and come complete with the test certificate.  


c: Frame/casement

Frames and door casements are usually made of wood, steel or aluminium surrounding the wall surface. Special designs such as corner frames, block frames and trim frames can of course also be used. Wooden frames surrounding the wall surface consist of the casement board (lining the internal wall opening) and the so-called linings. The linings largely determine the overall visual impression of a door element and should therefore be carefully selected in terms of width and shape -.


d:  Hinges

In rotating wing doors, the hinges form the connection between the door leaf and frame. Hinges normally consist of two parts, i.e. the so-called wing part (hinge upper part) is attached to the door leaf, and the frame part (hinge lower part) is seated in the hinge rebate in the frame.   

Home entrance door elements are frequently equipped with the nickel-plated hinge version V 4426 WF (three-piece hinge). The designation WF stands for ‘wartungsfrei’ (‘maintenance-free’). Creaking doors or iron abrasion in case of inadequate maintenance are therefore now things of the past. Light and silent movement of the door mean greater convenience of use. Door hinges come in a wide range of different materials, surface finishes and designs, and with regard to the version should be matched to the different door weights and requirements.   


e: Lock

Locks come in many different versions: Buntbart (BB) (barrel locks) for the normal room door, Profilzylinder (PZ) (profile cylinders) for the home outside door and (WC) for the bathroom and WC. The most common type of lock is the Buntbart (BB) (barrel lock). The Profilzylinder (PZ) (profile cylinder) is used mainly in the case of special security requirements. WC/bathroom locks dispense with keys, using only a rotating knob for opening and closing. In case of emergency, these can also be opened from the outside

One special feature at Köhnlein is the ‘whisper’ lock, which combines the advantages of plastic latch and bolt (quiet closing) with those of the metal latch and bolt (strength). 


f: Door handle/fittings

This is a component which includes a whole range of functional components on a door. The most frequent daily use is of course opening and closing. The door handle is therefore subjected to high stresses. Matching the relevant locks, door handles and fittings also come in the BB, PZ and WC versions. Door fittings can take the form of a knob or handle in combination with a short or long lock-plate or a rosette. On home outer doors we speak of outer door fittings, since the fitting on the outside of the door takes the form of a knob. Door fittings are available to meet a wide range of requirements. 


g: Surface

Köhnlein door elements are manufactured in a wide range of different  genuine wood veneer, decorative or CL (laminate) finishes, and as well as coloured, painted surfaces such as white or other RAL colours.

Selected genuine wood veneers are used. Köhnlein stands for industrial production with a high level of craftsmanship skill. Genuine wood veneer finishes are therefore produced both in the standard range and also on request in trunk veneers.

Only materials from leading brand manufacturers are used for the painted, decorative and laminate finishes. The latter includes wood and other colour reproductions which are particularly hard-wearing and easy to care for.         


h: Glazed panel/glazing

Glazed panels for interior door leaves come both in standard sizes (standard glazed panel) and also in special sizes and versions. Köhnlein offers a huge variety. For large glazed panels in particular, Köhnlein recommends the particularly shatterproof single-pane toughened glass.

The glazing is held in the panel by so-called glass rails in square, rounded or profiled versions. On request, Köhnlein can also supply the door leaves already glazed with the glass selected by the customer. 


i:  Opening direction/DIN direction

Door elements, i.e. door leaves and frames come in two different opening directions, namely DIN left and DIN right. In order to establish the DIN direction, imagine yourself standing in front of the door element, so that you can see the hinges (these are only visible from one side). If the hinges are on the left side, the opening direction is DIN left, and if on the right, DIN right. 

Make your selection in this case very carefully, taking into account the building planning and building circumstances. 


Basically, we recommend obtaining the advice of a specialist when choosing Köhnlein door elements   . 


Latest news

  • New CPL doors - by 6-CPL expands surfaces with horizontal "wooden structure"
  • Compact Edition. The extra-special class from Köhnlein. A high-quality range of doors comprising a total of 13 model ranges.



Köhnlein Türen GmbH   Heribert-Unfried-Str. 8-10   D-74597 Stimpfach   Tel.: 0049 79 67 / 1 54-0   Fax: 0049 79 67 / 1 54-46
Diese Webseite verwendet Cookies. Durch die Nutzung der Webseite akzeptieren Sie die Verwendung von Cookies. Weitere Informationen.