Socket Products Engineering Guide - Industrial and Bearing Supplies

FEWER HOLES TO DRILL AND TAPthree screws do thework of fiveCOMPACT SPACINGclearance for socketwrenchno wrench clearancenecessaryold method5–3/8-16 screws @120,000 psi tensile85,000 psi yield =5 x 85,000 x .0775 =33,000 lbs. max. loadUNBRAKO method3–3/8-16 screws @190,000 psi tensile170,000 psi yield =3 x 170,000 x .0775 =39,000 lbs. max. loadold method12–3/4-16 hexagonhead screws @120,000 psi tensilestrengthTotal strength =537,000 lbs.UNBRAKO method16–3/4-16 socket headcapscrews @ 180,000 psitensile strengthTotal strength =1,074,200 lbs.HIGH TENSILE AND YIELD STRENGTHHIGH SHEAR STRENGTHordinary boltssocket head cap screwsordinary boltssocket head cap screwsold method120,000 psi. 1/2-20 bolttensile = 19,200 lbs.yield = 13,600 lbs.UNBRAKO method190,000 psi 1/2-20UNBRAKOtensile = 30,400 lbs.yield = 27,200 lbs.Extra UNBRAKO jointstrength:tensile – 58% increaseyield – 100% increaseold method120,000 psi. 1/2-20 boltShear strength =14,100 lbs.UNBRAKO method190,000 psi. 1/2-20UNBRAKOShear strength =22,400 lbs.Extra UNBRAKO shearstrength = 8,300 lbs.less wrenching spaceneeded10