$[5]$ A bolted joint uses three $\frac{1}{4}"$ SAE Grade $4$ bolts

$($Sall $=66,355)$ as shown. A vertical load of $30$kipsuarr is

applied to the center of the upper plate. Both plates

are made from AISI $4130,$ HT$90$ Steel. $($a$)$ Find the

maximum bolt shear force, $($b$)$ the critical net tension

stress & MS$.$

$[6]$ Continuing with $[5],$ determine $($a$)$ the critical bearing

stress & MS$,$ and $($b$)$ the critical shear tear$-$out stress &

MS$.$