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Following a rigorous testing programme, the Huck® BobTail® lockbolt fastener from Arconic Fastening Systems (AFS) has earned the prestigious German national technical approval, otherwise known as allgemeine bauaufsichtliche Zulassungen (abZ). The accreditation was awarded by internationally recognised approval body Deutsches Institut für Bautechnik (DIBt).

Declared by DIBt as ‘maintenance free’, the 12, 14, 16, 20mm and 1inch diameter BobTail is now approved to be used in both static and dynamic civil engineering applications. The test results met DIN EN 1993 (EURO Code 3 – Design of Steel Structures), DIN 18800-1 (Steel Structures – Design and Construction) and BSEN 1090 (Execution of steel structures and aluminium structures) standards. The coating; resistant to ISO 12944 standard and chrome 6 free; was also found to retain its integrity as there is no exposed area after the fastener is installed.

An Allgemeine bauaufsichtliche Zulassungen (national technical approval) is granted to products and types of construction for which there are either no generally acknowledged rules of technology or DIN (Deutsches Institut Fur Normang e.V.)  standards. While DIBt’s abZ accreditation holds legal status in Germany, Austria and Switzerland only, it is widely recognised as a pan-European industrial quality standard. However, based on the DIBt approval AFS is currently in the process of securing an ETA (European Technical Approval) licence with plans for it to be in place by 2013.

Commenting on the outcome of the BobTail testing Hans-Albert Stadler, customer engineering director Europe at Arconic Fastening Systems, said: “The DIBt test confirmed that a BobTail is maintenance-free during the lifetime of the joint it is fastening, which is not the case when using traditional nut and bolt products. As a result, it can be integrated into a range of applications with complete confidence by civil engineering designers. Our next step is to seek DIBt approval for larger BobTail sizes M27, M30 and M36, as well as other fasteners such as the Magna-Bulb® and Magna-Lok®.”

You can find out more by downloading our DIBt newsletter here.


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