Installation Recomendations and Technical Detail

Tek Metal Building screws are designed and manufactured to work first time - every time. Whilst the product is able to withstand a certail amount of misuse, optimum results can be obtained by adhering to a few simple guidelines.			Correct Tool for Driving For proper istallation of Tek screws a suitable electric screw gun must always be used. The screw gun should incorporate both clutch and depth location mechanism. The adjustable nose-piece should always be used to ensure correct driving of screws and compression of washers.
Selection Always use the correct screw for the application - ensuring that total material build up and thickness are within the stated capacity of the screw.
It is most important that site operatives / users take suficient care and time making proper adjustment to driving tools (screw guns etc) in order to ensure that the washer compression is correct. See illustration below			Recommended Drill Speed for screw guns under axial load Screw Diameter Minimum Maximum up to 4.8mm 1800 2200 up to 5.5mm 1000 1600 up to 6.3mm 1000 1600
	INSUFFICIENT TIGHTENING		CORRECT INSTALLATION		EXCESSIVE TORQUE
	Likely to cause leakage under seal and around washer.		Tight against surface, seal flows inward to seal minor fastner diameter and surface voids.		Causes reverse dishing. Leakage under seal possible.
Tensile Strength
	Gauge KN 6 3.5mm 2.9 8 4.2mm 4.4 10 4.8mm 6.3 12 5.5mm 8.4 14 6.3mm 12.3		Gauge KN 6 3.5mm 5 8 4.2mm 7 10 4.8mm 10 12 5.5mm 14.1 14 6.3mm 17
Pull Out Strength (KN)
Screw Diameter and point type Steel Thickness 1.6mm 2.0mm 2.5mm 2.8mm 3.2mm 4.0mm 5.0mm 6.0mm 5.5mm Dia No 2pt 4.1 5.1 7.4 9.6 10.7       5.5mm Dia No 3pt 3.9 4.8 7.0 8.0 9.7 12.3     5.5mm Dia No 5pt           11.6 14.1* 14.1* 6.3mm Dia No 3pt 4.1 5.3 7.6 8.3 9.9 11.0       Test carried out in Z35 Material Test carried out in Z275 Material
* over 6mm limited due to tensile strength Additional technical information available on request. The figures shown above are the result of laboratory tests and are for guidance only