Trouble to install A pull up bar
I tried to mount 3 of the 9 holes per side to the stud, but one stud was screwed in with 3' lag screws and didn't insert well into the wood stud (I believe it wasn't centered).
Unfortunately, I need to place this pull up at this same heigh of the stud, and bad holes have already been drilled.
So I have decided to find an alternative, but unfortunately, new problems happened.
My initial goal was to buy a 2 x 8 and cut to 24'' length and use the bolt/washers/nuts to lock the pull up bars and have (each side) the 2 x 8 attached to one stud with (5) gsk structural 5/16 x 5'' screws.
But then, I realize the back side where the hex of the bolts has 1/4'' elevated, and in order to be flush to the wall, I have to countersink it, but I lost 0.5'' (including the thickness of a lock washer).
And after all is done, I realize the 2 x 8 is actually a 1.5 x 8 (I am not sure why the hardware store lied about the 2'' while it's 1.5''). Because of the countersink, I already lost 0.5''. So this makes it a 1 x 8...
Now are my questions:
1. Is 5/16 x '' structural screws will have enough strength considering both screws are drilled linear into one stud only?
2. I am unable to put a flat washer on the hex side because I have no drill bit that can countersink a large area. So I decided you use a smaller diameter lock washer on the hex side of the bolt.
So 9 bolts as followed ( Hex side --> lock washer --> wood --> lock washer --> flat washer --> nut). Will that be ok?
3. Is the 3/8'' bolt, 2'' length be strong enough?
4. Will the [1.5'x8 therefore countersink to become 1x8 wood stud] be strong enough for the pull up?
5. What is the torque of the nuts?
- Training 101