Direct Fastening Technical Guide , Edition 24
Allowable loads in minimum ASTM A36 ( F y ≥ 36 ksi , F u
≥ 58 ksi ) steel 1 , 2 , 4 , 5
Fastener description Fastener
Shank diameter in . ( mm )
Tension lb ( kN )
Steel thickness ( in .) 1 / 8 3 / 16 1 / 4 3 / 8 1 / 2 ≥3 / 4
Shear lb ( kN )
0.157 500 720 775 720 935 720 900 720 350 375
Universal knurled shank * X-U 6 – – ( 4.0 ) ( 2.22 ) ( 3.20 ) ( 3.45 ) ( 3.20 ) ( 4.16 ) ( 3.20 ) ( 4.00 ) ( 3.20 ) ( 1.56 ) ( 1.67 )
Stepped-shank knurling-lengthwise
Standard knurled shank
Drywall smooth shank w / metal top hat washer
Heavy duty knurled shank
Heavy duty smooth shank
Stainless steel smooth shank
Standard gas and battery fasteners for steel
Premium gas and battery fasteners
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
0.145 155 395 230 395 420 450 365 500 365 400
X-U 15 7 – – ( 3.7 ) ( 0.69 ) ( 1.76 ) ( 1.02 ) ( 1.76 ) ( 1.87 ) ( 2.00 ) ( 1.62 ) ( 2.22 ) ( 1.62 ) ( 1.78 )
X-S13
0.145 140 300 300 450 300 450 300 450 ( 3.7 ) ( 0.62 ) ( 1.33 ) ( 1.33 ) ( 2.00 ) ( 1.33 ) ( 2.00 ) ( 1.33 ) ( 2.00 ) 0.145
315 480 315 480 315 530 315 480
X-S16 10 – – ( 3.7 ) ( 1.40 ) ( 2.14 ) ( 1.40 ) ( 2.14 ) ( 1.40 ) ( 2.36 ) ( 1.40 ) ( 2.14 )
– – – –
– –
0.177 305 615 625 870 715 870 890 960 400 655
EDS 3 – – ( 4.5 ) ( 1.36 ) ( 2.74 ) ( 2.78 ) ( 3.87 ) ( 3.18 ) ( 3.87 ) ( 3.96 ) ( 4.27 ) ( 1.78 ) ( 2.91 )
DS
X-R 9 , X-CR
0.177 365 725 580 725 695 725 735 860
– – ( 4.5 ) ( 1.62 ) ( 3.22 ) ( 2.58 ) ( 3.22 ) ( 3.09 ) ( 3.22 ) ( 3.27 ) ( 3.83 )
0.145 ( 3.7 ) 0.157 ( 4.0 )
– –
460 460 615 500 ( 2.05 ) ( 2.05 ) ( 2.74 ) ( 2.22 )
– –
– – – – – – 0.145 300 190 615 495 760 500 220 325 225 335
X-R 8 , 9 ( 3.7 ) ( 1.33 ) ( 0.85 ) ( 2.74 ) ( 2.20 ) ( 3.38 ) ( 2.22 ) ( 0.98 ) ( 1.45 ) ( 1.00 ) ( 1.49 )
X-S 14 G3 X-S 14 B3 X-S 14 B4
X-S 14 G3 8 X-S 14 B3 8 X-S 14 B4 8
X-P G3 X-P B3 X-P B4
– – 0.118 140 230 220 245 225 290 280 330 280 330 280 330 ( 3.0 ) ( 0.62 ) ( 1.02 ) ( 0.98 ) ( 1.09 ) ( 1.00 ) ( 1.29 ) ( 1.25 ) ( 1.47 ) ( 1.25 ) ( 1.47 ) ( 1.25 ) ( 1.47 )
0.118 |
|
|
220 |
295 |
260 |
355 |
280 |
385 |
280 |
385 |
280 |
385 |
( 3.0 ) |
– |
– |
( 0.98 ) |
( 1.31 ) |
( 1.16 ) |
( 1.58 ) |
( 1.25 ) |
( 1.71 ) |
( 1.25 ) |
( 1.71 ) |
( 1.25 ) |
( 1.71 ) |
0.118 125 230 170 245 200 230 250 255 ( 3.0 ) ( 0.56 ) ( 1.02 ) ( 0.76 ) ( 1.09 ) ( 0.89 ) ( 1.02 ) ( 1.11 ) ( 1.13 )
– – – –
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 Low-velocity fasteners shall be driven to where the point of the fastener penetrates through the steel base material in accordance with Section 3.2.2.3 , except as noted in this table . 3 EDS fasteners installed into greater than 1 / 2 " thick steel require 1 / 2 " minimum penetration . 4 Multiple fasteners are recommended for any attachment . 5 Refer to guidelines for fastening to steel , Section 3.2.2 , for application limits . 6 Tabulated allowable load values provided for 3 / 4 " steel are based upon minimum point penetration of 1 / 2 " into the steel . If 1 / 2 " point penetration into the steel is not achieved , but a point penetration of at least 3 / 8 " is obtained , the tabulated tension value should be reduced by 20 percent and the tabulated shear load should be reduced by 8 percent . 7 X-U 15 fasteners installed into greater than 3 / 8 " thick steel require 15 / 32 " minimum penetration into the steel . 8 Based on testing with F y
= 50 ksi base material . 9 Fasteners installed into 3 / 8 " or thicker base require 0.38 ” minimum penetration depth into the steel . 10 Published values may vary from values in ICC-ESR
Allowable tensile pullover and shear bearing load capacities for steel framing with power driven fasteners 1 , 2 , 3 , 4
Fastener description Fastener
Head dia . in . ( mm )
Tension lb ( kN )
Sheet steel thickness 14 ga . 16 ga . 18 ga . 20 ga . 22 ga . 24 ga . 25 / 26 ga .
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
0.157 " shank with or w / o |
|
0.322 |
825 |
1,085 |
685 |
720
490
|
525 |
360
445
|
300
330
205
255
120
145
|
|
plastic washers or MX collation
X-U , X-P
|
|
( 8.2 ) |
( 3.67 ) |
( 4.83 ) |
( 3.05 ) |
( 3.20 ) ( 2.18 ) |
( 2.34 ) |
( 1.60 ) ( 1.98 ) |
( 1.33 ) ( 1.47 ) ( 0.91 ) ( 1.13 ) ( 0.53 ) ( 0.64 ) |
0.145 " shank with or w / o plastic washers or MX collation X-C , X-R 0.322
985 685 720 490 515 360 440 300 310 205 235 120 145
– ( 8.2 ) ( 4.38 ) ( 3.05 ) ( 3.20 ) ( 2.18 ) ( 2.29 ) ( 1.60 ) ( 1.96 ) ( 1.33 ) ( 1.38 ) ( 0.91 ) ( 1.05 ) ( 0.53 ) ( 0.64 )
0.177 " shank without washer DS , EDS
0.145 " shank with plastic top hat washers
X-S13 THP X-S16 TH
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
Shear lb ( kN )
Tension lb ( kN )
0.322 965 1,085 810 815 625 535 460 465 360 350 300 260 240 180
Shear lb ( kN )
( 8.2 ) ( 4.29 ) ( 4.83 ) ( 3.60 ) ( 3.63 ) ( 2.78 ) ( 2.38 ) ( 2.05 ) ( 2.07 ) ( 1.60 ) ( 1.56 ) ( 1.33 ) ( 1.16 ) ( 1.07 ) ( 0.80 ) 0.322
985 685 720 490 515 360 440 300 310 205 235 120 145
– ( 8.2 ) ( 4.38 ) ( 3.05 ) ( 3.20 ) ( 2.18 ) ( 2.29 ) ( 1.60 ) ( 1.96 ) ( 1.33 ) ( 1.38 ) ( 0.91 ) ( 1.05 ) ( 0.53 ) ( 0.64 )
1 Allowable load values are based on a safety factor of 3.0 . 2 Allowable pullover capacities of sheet steel should be compared to the allowable fastener tensile load capacities in concrete , steel , and masonry to determine controlling resistance load . 3 Allowable shear bearing capacities of sheet steel should be compared to allowable fastener shear capacities in concrete , steel and masonry to determine controlling resistance load . 4 Data is based on the following minimum sheet steel properties , F y
= 33 ksi , F u = 45 ksi ( ASTM A653 material ).
* More details about the innovative X-U fastener can be found in Section 3.2.6 .
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