Steel Deck Fastening Systems
Steel Deck Fastener Design and Selection 1.1
Piston mark (indentation) not
visible on fastener
Gap visible between washers
h NVS well above
optimal range*
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
Washers cutting into deck
sheet, deforming base
steel and deck sheet
h NVS well below
optimal range*
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