Direct Fastening Technical Guide , Edition 24
3.6.4.3 TECHNICAL DATA
Ultimate tensile strengths - pullout ( tension ), lb ( kN ) 1 , 2 , 3 , 4 , 5 , 8
Screw designation
Nominal diameter in .
# 10-16 0.190
# 12-14 0.216
1 / 4-14 0.250
1 / 4-20 0.250 –
18 16 14 12 ( 0.048 ) ( 0.060 ) ( 0.075 ) ( 0.105 )
5 / 16-18 0.313 – – –
5 / 16-24 0.313 – – –
Thickness of member not in contact with the screw head Steel 6 , ga ( in .) or in . Aluminum 7 , in .
1 / 8 3 / 16 1 / 4 5 / 16 1 / 8 1 / 4 3 / 8
410 580 710 920 890 920
– – – ( 1.82 ) ( 2.58 ) ( 3.16 ) ( 4.09 ) ( 3.96 ) ( 4.09 )
395 615 790 985 1530 1995 630 2745
– – ( 1.76 ) ( 2.74 ) ( 3.51 ) ( 4.38 ) ( 6.81 ) ( 8.87 ) ( 2.80 ) ( 12.21 )
395 620 765 1025 1685 2695 720 2905
– – ( 1.76 ) ( 2.76 ) ( 3.40 ) ( 4.56 ) ( 7.50 ) ( 11.99 ) ( 3.20 ) ( 12.92 )
– –
610 780 1270 1570 2740 3130 3620 690 2100 4365
( 2.71 ) ( 3.47 ) ( 5.65 ) ( 6.98 ) ( 12.19 ) ( 13.92 ) ( 16.10 ) ( 3.07 ) ( 9.34 ) ( 19.42 ) 1560 2120 ( 6.94 ) ( 9.43 )
– – – – – –
1375 1910 2170 3565 4270 ( 6.12 ) ( 8.50 ) ( 9.65 ) ( 15.86 ) ( 18.99 )
1 The lower of the ultimate pullout , pullover , and tension 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 diameters were used in the calculations and are listed in the tables . 5 The screw diameters in the table above are available in head styles of pan , hex washer head , pancake , flat , wafer and bugle . 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 .
–
– – –
Ultimate tensile strengths - pullover ( tension ), lb ( kN ) 1 , 2 , 4 , 5 , 7
Screw designation
Washer or head diameter in .
# 10-16 0.384
# 12-14 # 12-24
0.398
1 / 4-14 0.480
1 / 4-20 0.480 –
Thickness of member in contact with the screw head
18 16 14 12 ( 0.048 ) 3 ( 0.060 ) ( 0.075 ) ( 0.105 )
Hex Washer Head ( HWH )
Steel 6 , ga ( in .) or in .
1245 1445 1445 1445 1445 ( 5.54 ) ( 6.43 ) ( 6.43 ) ( 6.43 ) ( 6.43 ) 1290 1610 3 2015 3 2200 2200 2200 ( 5.74 ) ( 7.16 ) ( 8.96 ) ( 9.79 ) ( 9.79 ) ( 9.79 ) 1555 1945 3 2430 3 3380 3380 3380 ( 6.92 ) ( 8.65 ) ( 10.81 ) ( 15.03 ) ( 15.03 ) ( 15.03 )
5 / 16-18 0.600 – – –
5 / 16-24 0.600 – – –
# 10 0.357
1 / 8 3 / 16 1 / 4 5 / 16
– – –
– –
– –
1945 3 2430 3 3380 3380 3380 3380 3380 ( 8.65 ) ( 10.81 ) ( 15.03 ) ( 15.03 ) ( 15.03 ) ( 15.03 ) ( 15.03 )
Phillips Pan Head ( PPH )
3505 3505 ( 15.59 ) ( 15.59 )
1160 1445 1805 2530 3010 ( 5.16 ) ( 6.43 ) ( 8.03 ) ( 11.25 ) ( 13.39 )
– – –
3980 3980 3980 3980 3980 ( 17.70 ) ( 17.70 ) ( 17.70 ) ( 17.70 ) ( 17.70 )
– – –
1 The lower of the ultimate pullout , pullover , and tension fastener strength of screw should be used for design . 2 Unless otherwise noted , load values based upon testing completed in accordance with AISI S905 . 3 Load values for 18 gauge and noted 16 and 14 gauge steel are based upon calculations done in accordance with Section J4 of AISI S100 . ANSI / ASME standard screw head diameters were used in the calculations and are listed in the table . 4 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 . 5 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 . 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 .
7 Refer to Section 3.6.4.5 to ensure drilling capacities .
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