Direct Fastening Technical Guide , Edition 24
Ultimate and allowable loads in concrete masonry units 1 , 2 , 3 , 4 , 5 , 10
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Hollow CMU |
Fastener |
Shank diameter in . ( mm ) |
Minimum embedment in . ( mm ) |
Load type |
Tension lb ( kN )
Face shell 6 Mortar joint 6
Shear lb ( kN )
Tension lb ( kN )
Shear 7 lb ( kN )
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X-U 0.157 ( 4.0 ) 1 ( 25 )
Ultimate 449 ( 2.0 ) 524 ( 2.3 ) 244 ( 1.1 ) 483 ( 2.1 ) Allowable 70 ( 0.3 ) 85 ( 0.4 ) 25 ( 0.1 ) 70 ( 0.3 )
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Grout-filled CMU |
Fastener |
Shank diameter in . ( mm ) |
Minimum embedment in . ( mm ) |
Load type |
Tension lb ( kN )
Face shell 6 Mortar joint 6 Top of grouted cell 8
Shear 7 lb ( kN )
Tension lb ( kN )
Shear 7 lb ( kN )
Tension lb ( kN )
Shear 7 lb ( kN )
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X-U 0.157 ( 4.0 ) 1 ( 25 )
Ultimate 1124 ( 5.0 ) 1093 ( 4.9 ) 920 ( 4.1 ) 993 ( 4.4 ) 935 ( 4.2 ) 1194 ( 5.3 ) Allowable 225 ( 1.0 ) 220 ( 1.0 ) 150 ( 0.7 ) 190 ( 0.8 ) 165 ( 0.7 ) 240 ( 1.1 )
1 The tabulated allowable and ultimate load values are for the low-velocity fasteners only based on testing in accordance with ICC-ES AC 70 and ASTM E1190 . Allowable loads are calculated based on a safety factor of at least 5.0 . Some conditions like high wind loads , shock or fatigue may require a different safety factor . 2 The tabulated allowable and ultimate load values are for low-velocity fasteners installed in normal weight or lightweight concrete masonry units conforming to ASTM C90 . 3 The tabulated allowable and ultimate load values are for low-velocity fasteners installed in concrete masonry units with mortar conforming to ASTM C270 , Type S . 4 The tabulated allowable and ultimate load values are for low-velocity fasteners installed in concrete masonry units with grout conforming to ASTM C476 . 5 The tabulated allowable and ultimate 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 joints as shown in the figure below . 7 Shear load direction can be horizontal or vertical ( Bed Joint or T-Joint ) along the CMU wall plane . 8 Fastener located in center of grouted cell installed vertically . 9 Shear load can be in any direction in top of grouted cell application . 10 Multiple fasteners are recommended for any attachment .
Concrete Masonry Unit ( CMU )
Acceptable Locations ( NON-SHADED AREAS ) for X-U Universal Knurled Shank Fasteners in CMU Walls
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