Direct Fastening Technical Guide , Edition 24
Ultimate tensile strengths - pullover ( tension ), lb ( kN ) 1 , 2 , 4 , 5 , 6
Screw designation
Washer or head diameter In .
S-MS 8-18x1 / 2 HWH 3 0.335
S-MS 10-12x3 / 4 HWH 3 0.399 –
# 8 HWH Sharp 0.335
# 10 HWH Sharp 0.399
Thickness of member in contact with the screw head , ga ( in .) 28 26 24 22 20 18 16 ( 0.015 ) ( 0.018 ) ( 0.024 ) ( 0.030 ) ( 0.036 ) ( 0.048 ) ( 0.060 )
335 405 540 675 815
( 1.49 ) ( 1.80 ) ( 2.40 ) ( 3.00 ) ( 3.63 ) 480 645 805 970 1290 ( 2.14 ) ( 2.87 ) ( 3.58 ) ( 4.31 ) ( 5.74 ) 335 405 540 675 ( 1.49 ) ( 1.80 ) ( 2.40 ) ( 3.00 ) 400 480 645 805 970 ( 1.78 ) ( 2.14 ) ( 2.87 ) ( 3.58 ) ( 4.31 )
S-MD 8-18 HWH 0.335 – – –
S-MD 10-16 HWH 7 0.399 – – –
S-MD 12-14 HWH 7 0.415 – – –
– –
–
– – –
– –
675 815 1000 1000 ( 3.00 ) ( 3.63 ) ( 4.45 ) ( 4.45 ) 805 970 1290 1370 ( 3.58 ) ( 4.31 ) ( 5.74 ) ( 6.09 ) 835 1010 1340 1680 ( 3.71 ) ( 4.49 ) ( 5.96 ) ( 7.47 )
1 The lower of the ultimate pullout , pullover , and tension fastener strength of screw should be used for determination of allowable or factored resistance loads per footnote 4 .
2 Unless noted otherwise , load values 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 tables . 3 Load values based upon testing completed in accordance with AISI S905 . 4 AISI S100 recommends a safety factor of 3.0 be applied for allowable strength design ( ASD ), a Φ factor of 0.5 be applied for LRFD design and a Φ factor of 0.4 be applied for LSD design . 5 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 . 6 Refer to Section 3.6.3.5 to ensure optimal drilling capacities . 7 Load data for thicker steel connections available . Please reference Section 3.6.2 .
Nominal ultimate fastener strength of screw , lb ( kN ) 1 , 2 , 3
Screw designation
Nominal diameter In .
Nominal fastener strength Tension P ts
Shear P ss lb ( kN ) 1 lb ( kN ) 2 , 3
S-MS 8-18x1 / 2 HWH 0.164 1915 ( 8.52 ) 1570 ( 6.98 )
S-MS 10-12x3 / 4 HWH 0.190 1915 ( 8.52 ) 1905 ( 8.47 ) # 8 HWH Sharp 0.164 1610 ( 7.16 ) 860 ( 3.83 ) # 10 HWH Sharp 0.190 1915 ( 8.52 ) 1905 ( 8.47 ) S-MD 8-18 HWH 0.164 1000 ( 4.45 ) 1170 ( 5.20 ) S-MD 10-16 HWH 0.190 1370 ( 6.09 ) 1215 ( 5.40 ) S-MD 12-14 HWH 0.216 2325 ( 10.34 ) 1880 ( 8.36 )
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 ( ASD ), 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
Screw designation
Min . torsional strength in-lb ( Nm )
S-MS 8-18 57 ( 6.4 ) S-MS 10-12 92 ( 10.4 ) # 8 HWH Sharp 42 ( 4.8 ) # 10 HWH Sharp 61 ( 6.9 ) S-MD 8-18 42 ( 4.8 ) S-MD 10-16 61 ( 6.9 ) S-MD 12-14 92 ( 10.4 )
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 .
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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