Tensile and Shear Strength
Tensile and Shear Strength
(OP)
This is probably a dumb question, but no one i work with seems to know the answer.
I am looking for a book/chart that has the tensile and shear strengths of several different Socket Head Cap Screws. I have been told to call a supplier, but i want to have a hard copy format to keep at the office for anyone that needs it. Does anyone know where i can find this?
I am looking for a book/chart that has the tensile and shear strengths of several different Socket Head Cap Screws. I have been told to call a supplier, but i want to have a hard copy format to keep at the office for anyone that needs it. Does anyone know where i can find this?





RE: Tensile and Shear Strength
Try this link (I can't view it myself, our web security blocks it on me, but it looks like the right sort of thing)
http://w
it comes from
http://en.wikipedia.org/wiki/Screw
links at the bottom
Kevin
“Insanity in individuals is something rare, but in groups, parties, nations and epochs it is the rule” Nietzsche
RE: Tensile and Shear Strength
Don
Kansas City
RE: Tensile and Shear Strength
shear strength = 0.6* UTS
RE: Tensile and Shear Strength
I am designing a lifting fixture to pick up and object that weighs roughly 35,000 lbs. I need to know how many bolts to put into the object, as well as the fixture itself, so that I know that the Cap screws wont fail ad drop the 35,000 object to the floor. I am looking at using 1"-8 and 1.25"-7 cap screws. I just need to know how much 1 of each can old in tension and in shear so I can optimize my design.
RE: Tensile and Shear Strength
RE: Tensile and Shear Strength
RE: Tensile and Shear Strength
Shear properties are listed because you aren't supposed to put threaded fasteners in shear. Of course they are placed in shear, so general equations like metengr's are used. Try to have a full body shank (not the threaded section) through the joint's shear plane.
Regards,
Cory
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RE: Tensile and Shear Strength
RE: Tensile and Shear Strength
demonstrate that your structure can handle the loads ... worry about where the cg of the load could be, what SF do you need to lifting a load ? (i'd use at least 3) ... maybe consider one bolt in a group to be ineffective (ie need 5, use 6) ... worry about the shear/tension interaction (i'd use Rt^2+Rs^2 = 1, Rt, Rs = applied load/allowable; 'cause it's slightly conservative and much easier to use)
RE: Tensile and Shear Strength
You are right. I am after making sure I have enough bolts in the fixture so it does not fall. Onc I know that I will add more bolts so i know that the FOS is at least 3.
RE: Tensile and Shear Strength
You do not use bolts carry loads in tension.
You do not use bolts as shear pins.
Bolts are designed to be used to draw the two parts together. The load is then reacted in shear between the two parts, by friction alone.
Cheers
Greg Locock
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RE: Tensile and Shear Strength
Kinsrow.
RE: Tensile and Shear Strength
And though greglock is correct, but in the real world bolts are used to carry tension loads, especially in aircraft structures, thats why you can get a variety of bolts for shear or tension applications.
RE: Tensile and Shear Strength
RE: Tensile and Shear Strength
page 8 - double shear only (as it should be)
Last 2 years I did some work with a big defense contractor for a division of the US Navy. We ended up having to provide calculations proving between 3X and 5X factor of safety (for lifting), and slings etc rated for a 4 point lift failing to become a 2 point lift, even though the item being lifted would not physically handle being lifted at 2 points, and would have been hopelessly unstable (picture yo-yo) with most combination of 2 point lift.
FEA usually delights in pointing out that several of the bolts in my brackets, etc are completely superfluous. The solution is Thick flanges and keeping bolts as close as close to gussets (or is it gussets close to bolts?) as wrench clearance permits.
RE: Tensile and Shear Strength