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NATIONAL DESIGN SPECIFICATION FOR WOOD CONSTRUCTION 77 <br /> O e. <br /> I ) Table 12.2A Lag Screw Reference Withdrawal Design Values, W1 <br /> Tabulated withdrawal design values(W)are in pounds per inch of thread penetration into side grain of wood member. <br /> Length of thread penetration in main member shall not include the length of the tapered tip(see 12.2.1.1). <br /> Specific ' <br /> Gravity, Lag Screw Diameter,D <br /> G2 1/4" 5/16" 3/8" 7/16" 1 1/2" 5/8" 3/4" 7/8" 1" 1-1/8" 1-1/4" <br /> 0.73 397 469 i 538 604 668 789 905 1016 1123 1226 1327 <br /> 0.71 381 450 516 579 640 757 868 974 1077 1176 1273 <br /> 0.68 357 422 484 543 600 709 813 913 1009 1103 1193 <br /> 0.67 349 413 473 531 587 694 796 893 987 1078 1167 <br /> 0.58 281 332 381 428 473 559 641 719 795 869 940 <br /> 0.55 260 307 352 395 437 516 592 664 734 802 868 <br /> 0.51 232 274 314 353 390 461 528 593 656 716 775 <br /> 0.50 225 266 305 342 378 447 , 513 576 636 695 752 <br /> 0.49 2.1„8_ 258 296 332 367 434 498 559 617 674 730 <br /> 0.47 205 242 278 312 345 408 467 525 580 634 686 <br /> 0.46 19 , 235 269 302 334 395 453 508 562 613 664 <br /> 0.44 ,4dir. 220 252 283 312 369 423 475 525 574 621 <br /> 0.43 9 212 243 273 302 357 409 459 508 554 600 <br /> / <br /> 0.42 173 205 235 264 291 344 395 443 490 535 579 <br /> 0.41 167 198 226 254 281 332 381 428 473 516 559 p <br /> N O <br /> 0.40 161 190 218 245 271 320 367 412 455 497 538 <br /> 0.39 155 183 210 236 261 308 353 397 438 479 518 rm, <br /> 0.38 149 176 202 227 251 296 340 381 422 461 498 —1 <br /> 0.37 143 169 194 218 241 285 326 367 405 443 479 v <br /> 0.36 137 163 186 209 231 273 313 352 389 425 460 m <br /> 0.35 132 156 179 200 ] 222 262 300 337 373 407 441 N <br /> 0.31 110 130 149 t 167 185 i 218 250 1 281 i 311 339 367 m <br /> 1. Tabulated withdrawal design values.W,for lag screw connections shall be multiplied by all applicable adjustment factors(see Table 11.3.1). m <br /> 2. Specific gravity,G,shall be determined in accordance with Table 12.3.3A. M <br /> Cl, <br /> 12.2.3.4 For calculation of the fastener reference <br /> 12.2.3.2 For calculation of the fastener reference withdrawal design value in pounds, the unit reference 12 <br /> withdrawal design value in pounds, the unit reference withdrawal design value in lbs/in. of ring shank pene- <br /> withdrawal design value in lbs/in. of fastener penetra- tration from 12.2.3.3 shall be multiplied by the length <br /> tion from 12.2.3.1 shall be multiplied by the length of of ring shank penetration, pt, into the wood member. <br /> fastener penetration,pt, into the wood member. 12.2.3.5 Nails and spikes shall not be loaded in <br /> 12.2.3.3 The reference withdrawal design value, in withdrawal from end-grain of wood(Ces 0.0). <br /> lbs/in. of penetration,for a single post-frame ring shank 12.2.3.6 Nails and spikes shall not be loaded in <br /> nail driven in the side grain of the main member, with withdrawal from end-grain of laminations in cross- <br /> the nail axis perpendicular to the wood fibers, shall be laminated timber(Ceg=O.0). <br /> determined from Table 12.2D or Equation 12.2-4, with- <br /> in the range of specific gravities and nail diameters giv- <br /> en in Table 12.2D. Reference withdrawal design values, 12.2.4 Drift Bolts and Drift Pins <br /> W, shall be multiplied by all applicable adjustment fac- Reference withdrawal design values, W, for con <br /> tors (see Table 11.3.1) to obtain adjusted withdrawal <br /> design values, W'. nections using drift bolt and drift pin connections shall <br /> be determined in accordance with 11.1.1.3. <br /> W= 1800G2D (12.2-4) <br /> t <br /> AMERICAN WOOD COUNCIL C <br />