The Huck ® Bobtail ®
BobTail ® consist of two parts – a pin and a collar , but uses an entirely different installation method to nuts and bolts . As with nuts and bolts , BobTail ® can be preassembled by hand to ‘ lightly ’ assemble the structure , they are then swaged with the installation tool ( driven by pneumatic , pneudraulic or battery power ). During installation the clamp force is determined by the stretching of the hardened metal pin and the swaging of the collar into the pins locking grooves . Installation is quick and unlike traditional LockBolts ® no pin-break is required , BobTails ® pintail-less design means reduced noise , no waste , and improved corrosion resistance . This direct metal-tometal contact of the collar swaged into the grooves of the pin eliminates the loosening effects of transverse vibration .
BobTail ® can be installed in as little as two seconds .
When the installation tool is applied and the tool is activated , the action of the puller engaging onto the pin , together with the anvil swaging the collar completes the installation . The swage and eject sequence are programmed to complete the cycle without any additional installer input . The process ensures excellent gap closing capability .
HUCK BOBTAIL ® LOCKBOLTS DIBT ( DEUTSCHES INSTITUT FÜR BAUTECHNIK )
BobTail ® technical approval has been extended by 5 years . The approval gives BobTail ® Lockbolts the verification of ‘ static load-bearing capacity and fatigue strength ’ in the context of Eurocode 3 for applications in construction . The extension of the approval means BobTail ® Lockbolts
can be used in areas regulated by the building authorities as a replacement for non-preloaded structural bolting assemblies ( acc . to EN 15048 ) or high-strength structural bolting assemblies for preloading ( acc . to EN 14399 ). The values published can also be used in many other applications , including rail , commercial vehicles ( chassis ), lattice towers or wind turbines .
In addition to the load-bearing capacities , which are superior to that of a threaded bolt , BobTail ® offers other advantages , such as the low scatter when applying the preload force , the non-detachable connection , vibration resistance and high fatigue strength . BobTail ® Lockbolts are also characterized by the fact that they are mechanically maintenance-free ( no retightening required ) and are easy , quick and quiet to install .
The extent to which the regulations can be applied outside of Germany or in other areas of application must be clarified on a case-by-case basis with the regulatory authority or a certifier in the country in which the construction is to be undertaken .”
HUCK ® STRUCTURAL BLIND FASTENERS
Above , Huck ® Magna-
Lok ® MX - Designed to Replace M10 Bolting & the 6.4mm diameter
Magna-Lok
HuckLok ® Cross section
When only one side of the joint material is accessible , performance-engineered Huck ® structural blind fasteners have a solution . Each designed and engineered with a unique set of features and delivering solutions to common manufacturing challenges ; for example , hole-filling , water-resistance , wide grip ranges , welding replacement - all offering high-speed assembly .
Installed Huck ® BobTail ®, 16 mm
Two types of Huck ® blind fasteners that are widely used in modular construction are the HuckLok ® ( 6.4mm diameter ) and the Magna- Lok ® ( 9.5mm and also 12.7mm diameters ) as well as the Magna-Lok MX , which has been specifically designed to Replace M10 Bolting . Both of these products have a unique mechanical lock that ensures the integrity of the fastener in loaded conditions , and complete hole-filling properties to ensure moisture resistance .
Modular construction is not a new concept . Today ’ s volumetric modular off-site construction is a far cry from the pre-fab buildings of the nineteen forties / fifties .
They have undergone a series of innovative improvements and have attracted significant investment . Modern construction methods are shaping the way we work and live and will help us to meet the needs of the twentyfirst century in terms of sustainability and efficiency .
By installing HuckBolts ® and Huck ® structural blind fasteners , an engineer can count on many benefits including maintenance free joints ; lower lifetime cost of joint ; will not loosen even under extreme vibration ; high speed , easy to install systems that can reduce production time by 75 %; improvements to health and safety ; as well as being tamperproof .
Star Fasteners engineering support services enhance customers experience – we can assist with design , development and testing right through to choosing installation tooling , correct fastener installation and process optimisation .
Huck ® fasteners can deliver modular build projects more efficiently and effectively with high-quality , dependable , fastening solutions .
For further information , please visit www . starfasteners . co . uk
Issue 62 PECM 51