KonstruX, countersunk head stainless steel A4

KonstruX fully threaded screw

KonstruX A4 maximise a joint’s load-bearing capacity with a high threadextraction resistance in both components. If partially threaded screws are used, the joint’s load-bearing capacity is limited by the considerably lower head-pullthrough resistance in the attached part.

Suitable for use in wood/wood joints, both indoors and outdoors. The application areas of KonstruX A4 can be found on playgrounds, balconies, in sun protection in the form of a pergola as well as in hydraulic engineering, e.g. jetties and piers outdoors.

Advantages

• Can be used in service classes 1 to 3 according to DIN EN 1995 - Eurocode 5 (A4 T4/CRCIII. Suitable for heavily polluted urban and industrial areas and > 0.25 km from the coastline).
• Suitable for woods containing tannins and salty atmospheres
• Corrosion-resistant and conditionally acid-resistant
• Good resistance in moderately aggressive environments that do not contain chlorine

Material

• Austenitic high-grade steel A4 1.4401

Field of application for A4 stainless-steel screws:

• This steel is a stainless steel in accordance with the general building-authority approval Z-30.3-6. Resistant to rust and acid, it is also suitable for fastening tannin-containing woods (e.g. oak) and for use in saline atmospheres.
• Not suitable for use in chlorine-containing atmospheres, e.g. in indoor swimming pools.
• The screw is suitable for use in timber–timber joints in outdoor installations and is used in garden, façade and balcony construction.

One system for all timber-frame construction joints

• Applications in timber engineering and carpentry, timber-frame construction, hall construction, construction of timber elements, renovation of ceilings, etc.
• Maximum load transmission: KonstruX fully threaded screws maximise a joint‘s load-bearing capacity with a high thread-extraction resistance in both components. If partially threaded screws are used, the joint‘s load-bearing capacity is limited by the considerably lower head pull-through resistance in the attached part.
• A time- and cost-saving alternative to traditional connections or timber joints such as joist hangers, joist supports, etc.
• Timber has a low transverse compressive and shear strength. KonstruX fully threaded screws are inserted into the timber for reinforcement. The KonstruX “takes on” a large proportion of the forces.
• Doubling up of joists, for example, increases the load-bearing capacity of floor joists and reduces bending. Here, KonstruX fully threaded screws join the components together in a displacement-resistant manner.
• Hidden connections, high fire-resistance, no thermal bridges
• No pre-drilling required according to certification/ETA. However, from screw lengths ≥ 245 mm, it is recommended to drill a pilot hole of approx. 1/3 of the screw length in order to prevent the (long) screws from running too far into the wood. Pre-drilling is not needed for softwood, but recommended with a 6 mm drill bit. Pre-drilling with an 8 mm drill bit is mandatory for use in hardwood.
• The required edge and centre distances can be minimised for screws that are only exposed to tension.