Direct Fastening Technical Guide , Edition 24
Ultimate shear strengths – bearing ( shear ), lb ( kN ) 1 , 2 , 3 , 4 , 5 , 6 , 7
Screw designation
Nominal diameter in .
# 7 0.151
# 8 0.164
# 10-12 0.190
# 10-16 0.190
# 10-18 0.190
# 12-14 0.216
# 12-24 0.216
1 / 4 in . 0.250
Thickness of steel member in contact with screw head ga ( in .)
Thickness of steel member not in contact with the screw head , ga ( in .)
20 ( 0.036 ) 18 ( 0.048 ) 16 ( 0.060 ) 14 ( 0.075 ) ≥ 12 ( 0.105 )
20 ( 0.036 ) 500 ( 2.22 ) 660 ( 2.94 ) 660 ( 2.94 ) 660 ( 2.94 ) 660 ( 2.94 ) 18 ( 0.048 ) 500 ( 2.22 ) 770 ( 3.11 ) 880 ( 3.91 ) 880 ( 3.91 ) 880 ( 3.91 ) ≥ 16 ( 0.060 ) 500 ( 2.22 ) 770 ( 3.11 ) 890 ( 3.96 ) 890 ( 3.96 ) 890 ( 3.96 ) 20 ( 0.036 ) 525 ( 2.34 ) 715 ( 3.18 ) 715 ( 3.18 ) 715 ( 3.18 ) 715 ( 3.18 ) 18 ( 0.048 ) 525 ( 2.34 ) 805 ( 3.58 ) 955 ( 4.25 ) 955 ( 4.25 ) 955 ( 4.25 ) ≥ 16 ( 0.060 ) 525 ( 2.34 ) 805 ( 3.58 ) 1120 ( 4.98 ) 1170 ( 5.20 ) 1170 ( 5.20 ) 20 ( 0.036 ) 565 ( 2.51 ) 830 ( 3.69 ) 830 ( 3.69 ) 830 ( 3.69 ) 830 ( 3.69 ) 18 ( 0.048 ) 565 ( 2.51 ) 865 ( 3.85 ) 1110 ( 4.94 ) 1110 ( 4.94 ) 1110 ( 4.94 ) 16 ( 0.060 ) 565 ( 2.51 ) 865 ( 3.85 ) 1210 ( 5.38 ) 1390 ( 6.18 ) 1390 ( 6.18 ) ≥ 14 ( 0.075 ) 565 ( 2.51 ) 865 ( 3.85 ) 1210 ( 5.38 ) 1645 ( 7.32 ) 1645 ( 7.32 ) 20 ( 0.036 ) 565 ( 2.51 ) 830 ( 3.69 ) 830 ( 3.69 ) 830 ( 3.69 ) 830 ( 3.69 ) 18 ( 0.048 ) 565 ( 2.51 ) 865 ( 3.85 ) 1110 ( 4.94 ) 1110 ( 4.94 ) 1110 ( 4.94 ) ≥ 16 ( 0.060 ) 565 ( 2.51 ) 865 ( 3.85 ) 1210 ( 5.38 ) 1215 ( 5.40 ) 1215 ( 5.40 ) 20 ( 0.036 ) 565 ( 2.51 ) 830 ( 3.69 ) 830 ( 3.69 ) 830 ( 3.69 ) 830 ( 3.69 ) 18 ( 0.048 ) 565 ( 2.51 ) 865 ( 3.85 ) 1110 ( 4.94 ) 1110 ( 4.94 ) 1110 ( 4.94 ) 16 ( 0.060 ) 565 ( 2.51 ) 865 ( 3.85 ) 1210 ( 5.38 ) 1390 ( 6.18 ) 1390 ( 6.18 ) ≥ 14 ( 0.075 ) 565 ( 2.51 ) 865 ( 3.85 ) 1210 ( 5.38 ) 1645 ( 7.32 ) 1645 ( 7.32 ) 20 ( 0.036 ) 600 ( 2.67 ) 930 ( 4.14 ) 945 ( 4.20 ) 945 ( 4.20 ) 945 ( 4.20 ) 18 ( 0.048 ) 600 ( 2.67 ) 925 ( 4.11 ) 1260 ( 5.60 ) 1260 ( 5.60 ) 1260 ( 5.60 ) 16 ( 0.060 ) 600 ( 2.67 ) 925 ( 4.11 ) 1290 ( 5.74 ) 1570 ( 6.98 ) 1570 ( 6.98 ) ≥ 14 ( 0.075 ) 600 ( 2.67 ) 925 ( 4.11 ) 1290 ( 5.74 ) 1800 ( 8.00 ) 1880 ( 8.36 ) 20 ( 0.036 ) 600 ( 2.67 ) 930 ( 4.14 ) 945 ( 4.20 ) 945 ( 4.20 ) 945 ( 4.20 ) 18 ( 0.048 ) 600 ( 2.67 ) 925 ( 4.11 ) 1260 ( 5.60 ) 1260 ( 5.60 ) 1260 ( 5.60 ) 16 ( 0.060 ) 600 ( 2.67 ) 925 ( 4.11 ) 1290 ( 5.74 ) 1570 ( 6.98 ) 1570 ( 6.98 ) 14 ( 0.075 ) 600 ( 2.67 ) 925 ( 4.11 ) 1290 ( 5.74 ) 1800 ( 8.00 ) 1970 ( 8.76 ) ≥ 12 ( 0.090 ) 600 ( 2.67 ) 925 ( 4.11 ) 1290 ( 5.74 ) 1800 ( 8.00 ) 2285 ( 10.16 ) 20 ( 0.036 ) 645 ( 2.87 ) 1020 ( 4.54 ) 1090 ( 4.85 ) 1090 ( 4.85 ) 1090 ( 4.85 ) 18 ( 0.048 ) 645 ( 2.87 ) 995 ( 4.43 ) 1400 ( 6.23 ) 1460 ( 6.49 ) 1460 ( 6.49 ) 16 ( 0.060 ) 645 ( 2.87 ) 995 ( 4.43 ) 1390 ( 6.18 ) 1820 ( 8.10 ) 1820 ( 8.10 ) 14 ( 0.075 ) 645 ( 2.87 ) 995 ( 4.43 ) 1390 ( 6.18 ) 1940 ( 8.63 ) 2280 ( 10.14 ) ≥ 12 ( 0.090 ) 645 ( 2.87 ) 995 ( 4.43 ) 1390 ( 6.18 ) 1940 ( 8.63 ) 2440 ( 10.85 )
1 The lower of the ultimate shear bearing and shear fastener strength of screw should be used for design . 2 Load values based upon calculations done in accordance with Section J4 of AISI S100 . 3 AISI S100 recommends a safety factor of 3.0 be applied for allowable strength design , a Φ factor of 0.5 be applied for LRFD design or a Φ factor of 0.4 be applied for LSD design . 4 ANSI / ASME standard screw diameters were used in the calculations and are listed in the tables . 5 Load values in table are for Hex Washer Head ( HWH and HHWH ), Phillips Pan Head ( PPH ), Phillips Truss Head ( PTH ), Phillips Pancake Head ( PPCH ), and Phillips Flat Truss Head ( PFTH ) style screws . Phillips Bugle Head ( PBH ) and Phillips Wafer Head ( PWH ) styles are not covered by this table because they are not intended for attachment of steel to steel . 6 The load data in the table is based upon sheet steel with F u
= 45 ksi . For F u = 55 ksi steel , multiply values by 1.22 . For F u
= 65 ksi steel , multiply values by 1.44 .
7 Refer to Section 3.6.2.5 to ensure drilling capacities .
3.6.2.4 INSTALLATION INSTRUCTIONS
For general discussion of Hilti screw fastener installation , reference Section 3.6.1.7 .
For allowable diaphragm shear loads and stiffness values for steel roof or floor deck utilizing Hilti self‐drilling screws as frame or sidelap fasteners , reference Section 3.5 and download Hilti ’ s Profis DF software at www . hilti . com / decking ( US ), or www . hilti . ca ( Canada ).
To estimate the number of sidelap screws on a steel roof or floor deck project , reference Section 3.5.1.5 .
Warning : Because of the potential for delayed hydrogen assisted stress corrosion cracking , many hardened steel fasteners are not recommended for use with dissimilar metals or chemically treated wood when moisture may be present or in corrosive environments . For further information , contact Hilti Technical Support at 1-877-749-6337 .
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