Threaded stud placing Tightening torque Fitting tolerances / height of grating ( dimensions in mm ) t h II h h NVS NVS
X-ST-GR M8 / 10 P8
h NVS
= 5 / 8 " to 25 / 32 " ( 16.0 to 20.0 mm ) t II
= 1 / 4 " to 1 / 2 " ( 6 to 12 mm )
X-BT-GR M8 / 7 SN 8 1
h NVS
= 5 / 8 " to 11 / 16 " ( 15.7 to 16.8 mm ) t II
≥ 5 / 16 " ( 8 mm ) t II hNVS
T max
= 6.0 ft-lb ( 8.0 N-m ) for X-ST-GR .
4 3 2 1
Installation details for X-FCM grating disks 1
hNVS
S-BT-GR M8 / 7 SN6 S-BT-GF M8 / 7 AN6
h NVS
= 0.732 " -0.752 " ( 18.6 19.1mm )
T max
= 12.0 ft-lb ( 16.0 N-m ) for X-BT-GR M8 studs . 1
T max
= 3.6 ft-lb ( 5.0 N-m ) for S-BT M8 studs .
Tightening tool : Hilti screwdriver SF 18-A , SFH 18-A , SF 144-A or SFH 144 with 5 mm Torx Bit
Set clutch to appropriate setting to obtain desired torque .
T MAX
Min . grating height = L + 2
21.5 18
20 L 2
Governing requirement :
• Minimum 2 mm clearance between X-FCM and surface of base steel to allow for deflections
Example : X-FCM 25 / 30 Min . grating ht . = 23 + 2 = 25 mm Max . grating ht . = 23 + 7 = 30 mm
Grating height of 32 can be accommodated if
h NVS
≥ 18 mm
Max . grating height = L + 7
26.5
Governing requirement :
• Minimum 5 mm thread engagement at the minimum allowable stand-off , h NVS
.
Note :
23
16 L 7
• The maximum grating height for an X-FCM type can be extended if
h NVS is tightly controlled ( e . g . at 18 mm instead of 16 mm ). 2
Refer Section 3.2.14 for base steel thickness
1 Reference Section 3.2.14 for more details on proper installation of X-BT fasteners . Reference Section 3.2.15 for more details on proper installation of S-BT fasteners . Always consult
" Instructions for Use " for more detailed installation instructions . 2 Maximum grating height can be extended with the use of the X-SEA-R30 M8 . Reference Section 3.4.2.4 for photo .
Installation procedure for bar grating 1
1 . Place the grating sections following recognized safety precautions .
2 . Widen opening at fastening 3 . Place the threaded stud 4 . Tighten the disk , without exceeding maximum tightening torque
R
DX 750
≥11 / 16 "
≥11 / 16 "
30
NVS h NVS
1 Installation Instructions For Use ( IFU ) are included with each product package . They can also be viewed or downloaded online at www . hilti . com . Because of the possibility of changes , always verify that downloaded IFU are current when used . Proper installation is critical to achieve full performance . Training is available on request . Contact Hilti Technical Services for applications and conditions not addressed in the IFU .
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