Ultimate shear strengths – bearing ( shear ), lb ( kN ) 1 , 2 , 3 , 4 , 5 , 8
Screw designation
Nominal diameter in .
# 10-16 # 2 0.190
# 10-16 # 3 0.190
# 12-14 0.216
1 / 4-14 0.250
1 / 4-20 0.250
5 / 16-18 0.313
18 ( 0.048 ) - 18 ( 0.048
Thickness of members , in contact with screw head - not in contact with screw head
18 ( 0.048 ) - 14 ( 0.075 )
16 ( 0.060 ) - 16 ( 0.060 )
Steel 6 , ga ( in .) or in . Aluminum 7 , in .
14 ( 0.075 ) - 14 ( 0.075 )
1 / 8-3 / 16 3 / 16 – 1 / 4
1 / 4 - 12 ( 0.105 )
865 865 1210 1760
– – – – ( 3.85 ) ( 3.85 ) ( 5.38 ) ( 7.83 )
1105 1185 1360 1760
– – – – ( 4.92 ) ( 5.27 ) ( 6.05 ) ( 7.83 )
1 / 8 – 1 / 8 1 / 8 – 1 / 4
1070 1720 1540 1490 1005 1425
– – – ( 4.76 ) ( 7.65 ) ( 6.85 ) ( 6.63 ) ( 4.47 ) ( 6.34 )
1130 1880 1560 1985 1915 1215 1770
– – ( 5.03 ) ( 8.36 ) ( 6.94 ) ( 8.83 ) ( 8.52 ) ( 5.40 ) ( 7.87 )
1160 1580 1600 2010 1785 1870 1660 1185 1770 ( 5.16 ) ( 7.03 ) ( 7.12 ) ( 8.94 ) ( 7.94 ) ( 8.32 ) ( 7.38 ) ( 5.27 ) ( 7.87 ) 1225 1865 1685 2675 ( 5.45 ) ( 8.30 ) ( 7.50 ) ( 11.90 )
5 / 16-24 0.313 – – – –
– – – – –
4040 2955 2660 2220 3440 ( 17.97 ) ( 13.14 ) ( 11.83 ) ( 9.88 ) ( 15.30 )
1 The lower of the ultimate shear bearing and shear fastener strength of screw should be used for design . 2 Load values based upon testing completed in accordance with AISI S905 . 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 and a Φ factor of 0.4 be applied for LSD design . 4 ANSI / ASME standard screw head diameters were used in the calculations and are listed in the tables . 5 Load values in table are for Hex Washer Head ( HWH ) and Phillips Pan Head ( PPH ). Pancake Framing Head Undercut ( PFHUC ) and Phillips Wafer Head ( PWH ) styles are not covered by this table because they are not used for attachment of steel to steel or aluminum to aluminum . 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 Load values based upon testing in 6063-T5 aluminum alloy . 8 Refer to Section 3.6.4.5 to ensure drilling capacities .
–
–
Nominal ultimate fastener strength of screw 3
Screw designation
Nominal diameter in .
Tension , P ts lb ( kN ) 1
Nominal fastener strength
Shear , P ss lb ( kN ) 2
# 10-16 0.190 2275 ( 10.12 ) 1465 ( 6.52 ) # 12-14 0.216 3215 ( 14.30 ) 1990 ( 8.85 ) # 12-24 0.216 4175 ( 18.57 ) 2505 ( 11.14 ) 1 / 4-14 0.250 4365 ( 19.42 ) 2690 ( 11.97 ) 1 / 4-20 0.250 4365 ( 19.42 ) 2615 ( 11.63 ) 5 / 16-18 0.313 8070 ( 35.90 ) 4570 ( 20.33 ) 5 / 16-24 0.313 8755 ( 38.94 ) 5470 ( 24.33 )
1 The lower of the ultimate pullout , pullover , and tension fastener strength of screw should be used for design . The Pullout and Pullover tables in this section have already been adjusted where screw strength governs .
2 The lower of the ultimate shear fastener strength and shear bearing should be used for design . The Shear Bearing table in this section has already been adjusted where screw strength governs .
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 and a Φ factor of 0.4 be applied for LSD design .
228