Steel Deck Fastening Systems
Steel Deck Fastener Design and Selection 1.1 h NVS well above optimal range *
Piston mark ( indentation ) not visible on fastener Gap visible between washers
Washers not clamping deck sheet to base steel
Figure 12a : Under Driven X-ENP-19 Fastener with Single Sheet to Base Steel . h NVS within optimal range *
Piston mark ( indentation ) clearly visible on fastener
Washers snug against one another and clamping deck sheet to base steel
Figure 12b : Properly Driven X-ENP-19 Fastener with Single Sheet to Base Steel h NVS well below optimal range *
Washers cutting into deck sheet , deforming base steel and deck sheet
Figure 12c : Over Driven X-ENP-19 Fastener with Single Sheet to Base Steel
* Optimal stand-off ( h NVS ) range for the X-ENP-19 fastener is 8.2 mm ≤ h NVS
≤ 9.8 mm .
Hilti , Inc . ( US ) 1-800-879-8000 | www . us . hilti . com I en español 1-800-879-5000 I Hilti ( Canada ) Corp . 1-800-363-4458 I www . hilti . ca I PTG Decking Supplement 2014 9