Direct Fastening Technical Guide , Edition 22
Allowable Loads in Minimum f ' c = 3000 psi Structural Lightweight Concrete 1 , 4
Fastener description
1 / 4 – 20 Threaded Stud
3 / 8 – 16 Threaded Stud
Fastener
X-W6
W10
Shank dia . in . ( mm )
0.145 ( 3.7 )
0.205 ( 5.2 )
Min . embed . in . ( mm )
Installed into concrete
Tension lb ( kN )
Shear lb ( kN )
Fastener location
Upper flute
Installed through 3 " deep metal deck into concrete 2 , 3
Tension lb ( kN )
Lower flute
Shear lb ( kN )
3 / 4 ( 20 ) 125 ( 0.56 ) 185 ( 0.82 ) 125 ( 0.56 ) 115 ( 0.54 ) 185 ( 0.82 ) 1 ( 25 ) 175 ( 0.78 ) 185 ( 0.82 ) 160 ( 0.71 ) 180 ( 0.80 ) 185 ( 0.82 ) 1 ( 25 ) 265 ( 1.18 ) 190 ( 0.85 ) 160 ( 0.71 ) – 185 ( 0.82 ) 1-1 / 4 ( 32 ) 280 ( 1.25 ) 380 ( 1.69 ) 160 ( 0.71 ) 210 ( 0.93 ) 470 ( 2.09 ) 1-5 / 8 ( 41 ) 445 ( 1.98 ) 540 ( 2.40 ) 435 ( 1.93 ) 325 ( 1.45 ) 675 ( 3.00 )
1 The tabulated allowable load values are for the low-velocity fasteners only , using a safety factor that is greater than or equal to 5.0 , calculated in accordance with ICC-ES AC70 . Wood or steel members connected to the substrate must be investigated in accordance with accepted design criteria .
2 The steel deck profile is 3 " deep composite floor deck with a thickness of 20 gauge ( 0.0358 "). Figure 1 ( Section 3.2.1.6 ) shows the nominal flute dimensions , fastener locations and load orientations for the deck profile . 3 Structural lightweight concrete fill above top of metal deck shall be a minimum of 3-1 / 4 " deep . 4 Multiple fasteners are recommended for any attachment .
Allowable Loads in Concrete Masonry Units 1 , 2 , 3 , 4 , 5 , 8
Fastener description
Fastener
1 / 4-20 Threaded Stud X-W6
Shank diameter in . ( mm )
Minimum embedment in . ( mm )
Hollow CMU
���������
�������� �������
�� ��
Grout filled CMU Face shell 6 Mortar joint 6 Face shell 6 Mortar joint 6
Tension lb ( kN )
1 The tabulated allowable load values are for the low-velocity fastener only , using a safety factor of 5.0 or higher . Wood or steel members connected to the substrate must be investigated in accordance with accepted design criteria .
2 The tabulated allowable load values are for low-velocity fasteners installed in normal weight or lightweight concrete masonry units conforming to ASTM C90 .
3 The tabulated allowable load values are for low-velocity fasteners installed in concrete masonry units with mortar conforming to ASTM C270 , Type N .
4 The tabulated allowable load values are for low-velocity fasteners installed in concrete masonry units with grout conforming to ASTM C476 , as coarse grout .
5 The tabulated allowable load values are for one low-velocity fastener installed in an individual masonry unit cell and at least 4 " from the edge of the wall .
6 Fastener can be located anywhere on the face shell or mortar joint as shown in the figure to the right .
7 Shear direction can be horizontal or vertical ( Bed Joint or T-Joint ) along the CMU wall plane .
8 Multiple fasteners are recommended for any attachment .
Shear lb ( kN )
Tension lb ( kN )
Shear 7 lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
�������
���� �����
Tension lb ( kN )
Acceptable locations ( NON-SHADED AREAS ) for threaded studs in CMU walls
Shear 7 lb ( kN )
0.145 1 105 175 80 110 125 175 135 150 ( 3.7 ) ( 25 ) ( 0.47 ) ( 0.78 ) ( 0.36 ) ( 0.49 ) ( 0.56 ) ( 0.78 ) ( 0.60 ) ( 0.67 )
Allowable bending moments for threaded stud fasteners installed in minimum 2,000 psi concrete 1 , 2
Fastener designation M rec ft-lb ( Nm ) X-W6 3.6 ( 4.9 ) W10 10.0 ( 13.6 )
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 .
67