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AISI SPECIFICATION PROVISIONS for SCREW CONNECTIONS <br />NOTATION SCREW PROPERTIES GAUGE METAL THICKNESS <br />Number Nominal Gauge Thickness <br />d = nominal screw diameter <br />Designation Dia., d, in. (in. ) <br />dw = the larger of the screw head or washer <br /># 2 0.0860 25 ga. 0.019 <br />diameter, but not larger than 1/2"(5/16"MIN.) <br /># 3 0.0990 22 ga. 0.028 <br />FS = factor of safety = 3.0 <br /># 4 0.1120 20 ga. 0.035 <br />Pas = allowable shear force per screw <br /># 5 0.1250 18 ga. 0.045 <br />P,s= nominal shear strength per screw <br /># 6 0.1380 16 ga. 0.057 <br />Pat = allowable tension force per screw <br /># 7 0.1510 14 ga. 0.071 <br />Pnt = nominal tension strength per screw <br /># 8 0.1640 12 ga. 0.102 <br />PPot= pull-out force per screw <br /># 10 0.1900 Fu =45ksi min. <br />Pp.,, = pull -over force per screw <br /># 12 0.2160 <br />t1 = thickness of member in contact <br />1/4 in. 0.2500 <br />with the screw head <br />NOTE.- <br />t2 = thickness of member not in contact <br />1.) Screw sizes smaller than # 2 or larger than 1/4" <br />with the screw head <br />are not to be used. <br />Fu1 = tensile strength of member in contact <br />2.) The tested shear capacity of the screw shall not <br />with the screw head <br />be less than 1.25 Pns = 3.75 Pas. <br />Fu2 = tensile strength of member not in <br />3.) The tested tension capacity of the screw shall not <br />contact with the screw head <br />be less than 1.25 Pnt= 3.75 Pat. <br />E6.3 Shear E6.4 Tension <br />Pas = P ns/3 Pat = P nt/3 <br />For t2/t1 <=1.0 Pas shall be taken as the smaller of Pat shall be taken as the smaller of <br />Pas = 1.4 (t23 d)112Fu2 Pull - Out <br />Pas = 0.9 t1 d Fu1 Pat = 0.283 t2 d Fug <br />Pas = 0.9 t2 d Fug Pull - over <br />Pat = 0.5 t1 & Fu1 <br />For t2/t, >=2.5 Pas shall be taken as the smaller of <br />Pas = 0.9 t1 d Fu1 <br />Pas = 0.9 t2 d Fug <br />For 1.0< b/t1 <2.5 Pas shall be determined by the <br />linear interpolation between the above two cases <br />Al I OWARLF LOADS (Ibs.1 <br />SCREW <br />SIZE <br />#12 <br />d = 0.216 <br />#10 <br />d = 0.190 <br />#8 <br />d = 0.164 <br />#6 <br />d = 0.138 <br />GAUGE <br />SHEAR <br />PULL-OUT <br />SHEAR <br />PULL-OUT <br />SHEAR <br />PULL-OUT <br />SHEAR <br />PULL-OUT <br />25 <br />75 <br />52 <br />71 <br />46 <br />66 <br />39 <br />60 <br />33 <br />22 <br />139 <br />78 <br />131 <br />69 <br />121 <br />59 <br />111 <br />50 <br />20 <br />188 <br />95 <br />177 <br />84 <br />164 <br />72 <br />151 <br />61 <br />18 <br />280 <br />124 <br />263 <br />109 <br />244 <br />94 <br />224 <br />79 <br />16 <br />394 <br />156 <br />370 <br />137 <br />r246 <br />344 <br />118 <br />315 <br />100 <br />14 <br />557 <br />196 <br />523 <br />173 <br />474 <br />149 <br />398 <br />125 <br />12 <br />890 <br />280 <br />783 <br />675 <br />213 <br />568 <br />179 <br />Min. Edge <br />Dist. and <br />o/c Spacing <br />11/16 in. <br />9/16 in. <br />112 in. <br />7/16 in. <br />E`141:4 a'Pt+'i• ffa <br />�R <br />1 <br />