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Grade-5-ASTM-A449-Tapping-Fasteners


DESIGN OF TAPPING FASTENERS SAE-J429/GRADE 5, OR ASTM-A449 MATERIAL SPECIFICATIONS
FASTENER SIZETHREADS/INCH
MINIMUM ULTIMATE TENSILE STRENGTH (Fu) MINIMUM TENSILE YIELD STRENGTH (Fy) = 120000 psi = 92000 psi

D NOMINAL DIAMETE R (IN.)

K BASIC MINOR DIAMETER (IN.)

A(R) THREAD ROOT AREA (IN.2)

ALLOWABLE BEARING (LBS.) ALLOW. TENSIO N (LB.) ALLOW. SHEAR (LB.) 1/8” STL. A-36 HOLE SLOT 1/8” ALUM. 6063-T5 HOLE SLOT 1/8” ALUM. 6063-T6 HOLE SLOT

#6-20 #8-18 #10-16 #12-14 #14-14 1/4”-14 5/16”-12 3/8”-12
NOTES

0.1380 0.1640 0.1900 0.2160 0.2420 0.2500 0.3125 0.3750

0.0997 0.1257 0.1389 0.1649 0.1880 0.1887 0.2443 0.2983

0.0078 0.0124 0.0152 0.0214 0.0278 0.0280 0.0469 0.0699

375 596 727 1025 1332 1342 2250 3355

216 244 420 592 769 775 1299 1937

1201 1427 1653 1879 2105 2175 2719 3263

1001 1189 1378 1566 1755 1813 2266 2719

397 472 546 621 696 719 898 1078

259 308 356 405 454 469 586 703

535 636 736 837 938 969 1211 1453

362 431 499 567 635 656 820 984

ALLOWABLE STRESSES AND DESIGN PROCEDURES FOR TAPPING FASTENERS ARE PER AAMA TIR-A9-1991 PUBLICATION, “METAL CURTAIN WALL FASTENERS”. IS BASED UPON THREADS INCLUDED IN SHEAR PLANE.

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A(R) = 0.7854*(K) 2 ALLOWABLE TENSION = 0.40*Fu*[A(R)] ALLOWABLE SHEAR = (0.40/1.7321)*Fu*[A(R)] ALLOWABLE BEARING/STEEL = 1.2*Fu*D*0.125 (HOLE) ALLOWABLE BEARING/STEEL = 1.0*Fu*D*0.125 (SLOT) ALLOWABLE BEARING/ALUMINUM = *D*0.125 (REF. “SPECS FOR ALUMINUM STRUCTURES”) (HOLE) = 23,000 psi (6063-T5) (SLOT) = 15,000 psi (6063-T5) (SLOT) = 21,000 psi (6063-T6) (HOLE) = 31,000 psi (6063-T6) INTERACTION = ( / )2 + ( / )2 ≤ 1 DESIGN CAPACITIES CAN BE INCREASED ONE-THIRD FOR EARTHQUAKE OR WIND RESISTANCE.

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