Product Technical Guides : US-EN Direct Fastening - Volume 1 Edition 22 | Page 142

3.4 GRATING AND CHECKERPLATE

3.4 GRATING AND CHECKERPLATE

3.4.1 GRATING AND CHECKERPLATE FASTENER SELECTION
The following sections describe grating and checkerplate fastening solutions for marine and industrial environments . These solutions consist of powder-actuated , screw-in and mechanical fasteners which provide the installer with highly productive , high quality solutions which are designed to fit the needs of the particular application .
The primary concern when determining which solution to choose is the level of corrosion resistance required . For marine environments , Hilti offers a stainless steel grating or checkerplate disk and powder-actuated or screw-in stud . Stainless steel studs are attached directly to the base steel , while the disk is then attached using a screw fastening tool . If through penetration of the base material is not desired , or if the base material onto which the grating panels are installed is very thick , an option for stud attachment is the Hilti X-BT-GR system . The Hilti X-BT-GR system consists of a specialized tool set which enables the installer to pre-drill a small pilot hole into the base steel . A blunt tip stud , the diameter of which is slightly larger than that of the pre-drilled hole is then fastened with a Hilti powder-actuated tool directly into the pilot hole . Finally , the disk is installed on the stud with a screw fastening tool .
The Hilti S-BT system offers solutions to not only thick base material but also thin base material in which through penetration is acceptable . The Hilti S-BT system also consists of a specialized tool for pre-drilling the base steel , a threaded tip which cuts into the pre-drilled hole using a Hilti screw fastening tool equipped with proper depth gauge . And similarly the disk can be installed on the S-BT stud . More information about the innovative S-BT fastening system can be found in Section 3.2.15 .
For less corrosive environments , Hilti offers the X-GR powderactuated fasteners which feature stainless steel fasteners and duplex coated ( similar to hot dip galvanized ) pre-mounted saddle clip fasteners . These fasteners offer high productivity and corrosion resistance at a level which is typically needed in non-marine , semi-corrosive exposed environments . For those cases where powder-actuated solutions are not desired , Hilti also offers a mechanical clamp , the X-MGR . This fastener features a hot dip galvanized coating and will fit most standard open bar grating panels .
X-FCM Grating Disk System X-GR Grating Fastening System
X-MGR Grating Fastening System
Hilti grating and checkerplate product selection guide 1 , 5
Hilti system
X-FCM Grating Disk System
X-FCP Checkerplate Disk System
X-GR Grating Fastening System
X-MGR Grating Fastening System
Corrosion resistance 2 Grating /
Hot-dipped galvanized
X-FCM-M Duplex Coated 2
X-FCP-F Duplex Coated 2
Stainless steel
X-FCM-R
X-FCP-R
Duplex Coated 2 –
HDG minimum 45 μm
– checkerplate height in . ( mm )
Base steel thickness in . ( mm )
Steel or FRP grating 1 to 2 ( 25 to 50 ) ≥ 1 / 4 3
Checkerplate 1 / 4 to 1 / 2 ( 6 to 12 )
Steel grating 1 to 1-1 / 2 ( 25 to 38 )
Steel grating 1 to 1-1 / 2 ( 25 to 38 )
( ≥ 6 )
1 / 8 to 1 / 2 4 , 5 ( 4 to 12 )
1 / 8 to 1 ( 3 to 25 )
Connection type
Powder-actuated or screw-in
Powder-actuated
Powder-actuated
Mechanical
1 Reference entire section for specific details on allowable load values , selection and installation . More information on X-FCM Grating and X-FCP Checkerplate Disk Systems can be found in
Section 3.4.2 . More information on X-GR and X-MGR Grating Systems can be found in Section 3.4.3 . 2 Reference Section 2.3.3.1 for more information on coatings and corrosion resistance . 3 X-BT-GR M8 threaded studs require a minimum steel thickness of 5 / 16 " ( 8 mm ) to ensure no through point penetration . Refer to Section 3.2.15 for steel thickness requirement for S-BT screw-in studs . X-ST-GR M8 threaded studs have a maximum application limit of 1 / 2 " ( 12 mm ). 4 Disk or saddle may be removed easily . Threaded stud or base will remain in base steel unless removed by overloading fastener . 5 Fastening in base material thickness beyond 1 / 2 '' ( 12 mm ) is possible for A36 and Grade 40 steels . Site testing required .
142