Laserfiche WebLink
AISI SPECIFICATION PROVISIONS for SCREW CONNECTIONS <br /> NOTATION SCREW PROPERTIES GAUGE METAL THICKNESS <br /> Number Nominal Gauge Thickness <br /> d = nominal screw diameter Designation Dia., d, in. ( in. ) <br /> dW= the larger of the screw head or washer #2 0.0860 25 ga. 0.019 <br /> diameter, but not larger than 1/2"(5/16°MIN.) #3 0.0990 22 ga. 0.028 <br /> FS =factor of safety= 3.0 #4 0.1120 20 ga. 0.035 <br /> Pas= allowable shear force per screw #5 0.1250 18 ga. 0.045 <br /> Pns= nominal shear strength per screw #6 0.1380 16 ga. 0.057 <br /> Pat= allowable tension force per screw #7 0.1510 14 ga. 0.071 <br /> Pnt= nominal tension strength per screw #8 0.1640 12 ga. 0.102 <br /> PPot= pull-out force per screw # 10 0.1900 Fu =45ksi min. <br /> Ppo,= pull-over force per screw # 12 0.2160 <br /> t, = thickness of member in contact 1/4 in. 0.2500 <br /> with the screw head NOTE:- <br /> t2 =thickness of member not in contact 1.) Screw sizes smaller than#2 or larger than 1/4" <br /> with the screw head are not to be used. <br /> Fu, =tensile strength of member in contact 2.) The tested shear capacity of the screw shall not <br /> with the screw head be less than 1.25 Pns= 3.75 Pas. <br /> Fu2= tensile strength of member not in 3.) The tested tension capacity of the screw shall not <br /> contact with the screw head 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/t,<=1.0 Pas shall be taken as the smaller of Pat shall be taken as the smaller of <br /> Pas = 1.4 (t23 d)'/2Fu2 Pull -Out <br /> Pas= 0.9 tt d Fu, Pat= 0.283 1:2 d F.2 <br /> Pas= 0.9 t2 d Fug Pull -over <br /> Pat= 0.5 t, dW Fut <br /> For t2/t,>=2.5 Pas shall be taken as the smaller of <br /> Pas= 0.9 tt d Fut <br /> Pas= 0.9 t2 d F.2 <br /> For 1.0< b/t,<2.5 Pas shall be determined by the <br /> linear interpolation between the above two cases <br /> ALLOWABLE LOADS (lbs.) <br /> SCREW #12 #10 #8 #6 <br /> SIZE d= 0.216 d= 0.190 d= 0.164 d= 0.138 <br /> GAUGE SHEAR PULL-OUT SHEAR PULL-OUT SHEAR PULL-OUT SHEAR PULL-OUT <br /> 25 75 52 71 46 66 39 60 33 <br /> 22 139 78 131 69 121 59 111 50 <br /> 20 188 95 177 84 164 72 151 61 <br /> 18 280 124 263 109 244 94 224 79 <br /> 16 394 156 370 137 344 118 315 100 <br /> 14 557 196 523 173 474 149 398 125 <br /> 12 890 280 783 246 675 213 568 179 <br /> Min.Edge <br /> Dist.and 11/16 in. 9/16 in. 1/2 in. 7/16 in. <br /> o/c Spacing <br /> SCREWS TO HAVE 5116" MINIMUM HEAD DIAMETER. <br /> LTT <br />