Product Technical Guides : US-EN Direct Fastening - Volume 1 Edition 22 | Page 216

Ultimate tensile strengths – pullover ( tension ), lb ( kN ) 1 , 2 , 3 , 4 , 5 , 6 , 7
Screw designation
Washer or head diameter in .
# 8 0.335
# 10 0.399
# 12-14 0.415
# 12-24 0.415
1 / 4 in . 0.500
# 7 0.303
# 8 0.311
# 10 0.364
# 8 0.411
# 10 0.433
# 10 , # 12 0.409
# 10 0.364
Thickness of steel member in contact with the screw head , ga ( in .) 22 20 18 16 14 12 10
( 0.030 ) ( 0.036 ) ( 0.048 ) ( 0.060 ) ( 0.075 ) ( 0.105 ) ( 0.135 )
Hex Washer Head ( HWH )
675
815
1000
1000
1000
1000
1000
( 3.00 )
( 3.63 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
805
970
1290
1370
1370
1370
1370
( 3.58 )
( 4.31 )
( 5.74 )
( 6.09 )
( 6.09 )
( 6.09 )
( 6.09 )
835
1010
1340
1680
2100
2325
2325
( 3.71 )
( 4.49 )
( 5.96 )
( 7.47 )
( 9.34 )
( 10.34 )
( 10.34 )
835
1010
1340
1680
2100
2940
3780
( 3.71 )
( 4.49 )
( 5.96 )
( 7.47 )
( 9.34 )
( 13.08 )
( 16.81 )
1010
1220
1620
2030
2530
3540
4560
( 4.49 )
( 5.43 )
( 7.21 )
( 9.03 )
( 11.25 )
( 13.75 )
( 20.28 )
Phillips Pan Head ( PPH )
615
735
980
1000
1000
1000
1000
( 2.74 )
( 3.27 )
( 4.36 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
630
755
1000
1000
1000
1000
1000
( 2.80 )
( 3.36 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
740
885
1180
1370
1370
1370
1370
( 3.29 )
( 3.94 )
( 5.25 )
( 6.09 )
( 6.09 )
( 6.09 )
( 6.09 )
Phillips Truss Head ( PTH )
830
1000
1000
1000
1000
1000
1000
( 3.69 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
( 4.45 )
875
1050
1390
1390
1390
1390
1390
( 3.89 )
( 4.67 )
( 6.18 )
( 6.18 )
( 6.18 )
( 6.18 )
( 6.18 )
Phillips Pancake Head ( PPCH )
830
995
1325
1370
1370
1370
1370
( 3.69 )
( 4.43 )
( 5.89 )
( 6.09 )
( 6.09 )
( 6.09 )
( 6.09 )
Phillips Flat Truss Head ( PFTH )
740
885
1180
1475
1840
2170
2170
( 3.29 )
( 3.94 )
( 5.25 )
( 6.56 )
( 8.18 )
( 9.65 )
( 9.65 )
1 The lower of the ultimate pullout , pullover , and tension fastener strength of screw should be used for design . 2 Load values based upon calculations done in accordance with Section J4 of the 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 head diameters were used in the calculations and are listed in the tables . 5 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 for drilling capacities .
Nominal ultimate fastener strength of screw
Screw designation
Nominal diameter
( in .)
Nominal fastener strength
Tension , P ts
Shear , P ss lb ( kN ) 1 lb ( kN ) 2 , 3
# 6-20
0.138
1000
( 4.45 )
890
( 3.96 )
# 7-18
0.151
1000
( 4.45 )
890
( 3.96 )
# 8-18
0.164
1000
( 4.45 )
1170
( 5.20 )
# 10-12
0.190
2170
( 9.65 )
1645
( 7.32 )
# 10-16
0.190
1370
( 6.09 )
1215
( 5.40 )
# 10-18
0.190
1390
( 6.18 )
1645
( 7.32 )
# 12-14
0.216
2325
( 10.34 )
1880
( 8.36 )
# 12-24
0.216
3900
( 17.35 )
2285
( 10.16 )
1 / 4 in .
0.250
4580
( 20.37 )
2440
( 10.85 )
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 or a Φ factor of 0.4 be applied for LSD design .
Torsional strength 1 , 2
Size
Min . torsional strength in-lb ( Nm )
6-20
24
( 2.7 )
7-18
38
( 4.3 )
8-18
42
( 4.8 )
10-12
61
( 6.9 )
10-16
61
( 6.9 )
10-18
61
( 6.9 )
10-24
65
( 7.3 )
12-14
92
( 10.4 )
12-24
100
( 11.3 )
1 / 4-14
150
( 17.0 )
1 / 4-20
156
( 17.6 )
1 Based on screw only . Does not consider base material limitations .
2 Values in table are ultimate torsional strengths . To obtain maximum setting torque , multiply values in table by 0.66 .
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