Direct Fastening Technical Guide , Edition 24
Allowable loads in minimum ASTM A36 ( F y ≥ 36 ksi ; F u
≥ 58 ksi ) steel 1 , 2
Stud type
Shank diameter in . ( mm )
X-EW6H 0.145 ( 3.7 )
Tension lb ( kN )
Steel thickness in . ( mm ) 3 / 16 ( 4.8 ) 1 / 4 ( 6.4 ) 3 / 8 ( 9.5 ) 1 / 2 ( 12.7 ) ≥ 3 / 4 ( 19.1 )
Shear lb ( kN )
X-EW10H 0.205 ( 5.2 ) – –
X-ST-GR M8 0.157 ( 4.0 ) – –
Tension lb ( kN )
Shear lb ( kN )
X-BT-MR W6 / W10 , X-BT-GR M8 3 Tapered 4 – – – –
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
360 500 500 600 500 600 500 600 500 600
( 1.60 ) ( 2.22 ) ( 2.22 ) ( 2.67 ) ( 2.22 ) ( 2.67 ) ( 2.22 ) ( 2.67 ) ( 2.22 ) ( 2.67 ) 970 1000 1100 1100 1100 1100 800 800 ( 4.31 ) ( 4.45 ) ( 4.89 ) ( 4.89 ) ( 4.89 ) ( 4.89 ) ( 3.56 ) ( 3.56 ) 405 405 405 405 ( 1.80 ) ( 1.80 ) ( 1.80 ) ( 1.80 )
– – – –
775 820 775 820 775 820 ( 3.45 ) ( 3.65 ) ( 3.45 ) ( 3.65 ) ( 3.45 ) ( 3.65 )
1 The tabulated allowable load values are for the low-velocity threaded studs only , using a factor of safety that is greater than or equal to 5.0 , calculated in accordance with AC70 . Wood or steel members connected to the substrate must be investigated in accordance with accepted design criteria .
2 Tabulated allowable load values based upon embedment in steel such that threaded stud stand-off , h NVS , complies with the Threaded Steel Stud
Specification Table . 3 To prevent through penetration or damage to coatings on the base steel , a minimum base steel thickness of 5 / 16 " is required for X-BT threaded studs . Load values provided for 3 / 8 " base steel thickness are also valid for 5 / 16 " base steel thickness . For further information , reference Section 3.2.14 . 4 Shank diameter : 0.213 " - 0.193 " ( 5.4mm - 4.9mm )
Allowable bending moments for threaded stud fasteners installed in minimum ASTM A36 steel 1 , 2
Fastener nomenclature M rec ft-lb ( Nm ) X-EW6H 2.2 ( 3.0 ) X-EW10H 6.5 ( 8.8 ) X-ST-GR M8 4.0 ( 5.5 ) X-BT-MR W6 / W10 , X-BT-GR M8 * 14.8 ( 20.0 )
1 Based on a safety factor greater than or equal to 2.0 . 2 For more information on bending moments , reference Section 3.2.2.7 .
3.2.12.4 INSTALLATION INSTRUCTIONS 1 , 2
T max h NVS
1 . Press tip of fastener to steel material . Drive fastener with Hilti powder-actuated tool .
2 . Ensure proper threaded stud stand-off .
3 . Make attachment . Do not exceed maximum tightening torque , T max
.
1 These are abbreviated instructions which may vary by application . ALWAYS review / follow the instructions accompanying the product . 2 Installation instructions for innovative blunt-tip X-BT fasteners are provided in Section 3.2.14.4
Maximum tightening torque , T max
, for threaded studs driven into steel , ft-lb ( Nm )
Stud type X-EW6H X-EW10H X-ST-GR M8 X-BT-MR W6 / W10 * X-BT-GR M8 * 3.0 ( 4.1 ) 11.0 ( 14.9 ) 6.0 ( 8.1 ) 14.8 ( 20.0 ) 12.0 ( 16.0 )
* Innovative blunt-tip X-BT fasteners are installed with a Hilti DX 351 BT powder-actuated tool and discussed in more detail in Section 3.2.14 .
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