bolt sheer strenght

COXJ · Oct 5, 2004

about what is the sheer strength of a 7/16th (grade 8?) it has 6 lines on the top with a u between them. the are greceable so the are drilled about half way threw. then my second question would it be worth it to just ditch the greecable one in favor of a solid one? this is for my single torq arm wich is in doubble sheer withe the load spread evenly. thanks

one more thing is it sheer or shear?

Liam

Bender · Oct 5, 2004

It's "shear"

Generally the bolt strength in single shear is 2/3 of it's strength under pure axial tension.
In double shear the bolt strength is about 3/2 of it's strength in pure axial tension.

Read this and be enlightened
http://www.rockcrawler.com/techreports/fasteners/index.asp

Dirk Pitt · Oct 5, 2004

it's also grease not greece.

C-ROK · Oct 5, 2004

COXJ said:
about what is the sheer strength of a 7/16th (grade 8?) it has 6 lines on the top with a u between them. the are greceable so the are drilled about half way threw. then my second question would it be worth it to just ditch the greecable one in favor of a solid one? this is for my single torq arm wich is in doubble sheer withe the load spread evenly. thanks

one more thing is it sheer or shear?

Liam

By my calcs:

A 7/16" Gr 8 has a single shear of 4209lbs through the threads and 6019 lbs through the shank.
The tensile strength is 8118 lbs.

This is for a solid shaft bolt. Drilling out will obviously reduce the values. If you can give me the drilled out hole diameter I could calc the "theroretical" bolt strength by the reduced cross sectional area.

XJJPR · Oct 5, 2004

C-ROK said:
By my calcs:

A 7/16" Gr 8 has a single shear of 4209lbs through the threads and 6019 lbs through the shank.
The tensile strength is 8118 lbs.

This is for a solid shaft bolt. Drilling out will obviously reduce the values. If you can give me the drilled out hole diameter I could calc the "theroretical" bolt strength by the reduced cross sectional area.

Man, could you be a little more specific!!!!!!!!1

hinkley

C-ROK · Oct 5, 2004

Mark Hinkley said:
Man, could you be a little more specific!!!!!!!!1

hinkley

Hell, calc'n bolt strengths is the easy part. Determining what bolt strength you need is where it get's tough.

Let's see: 38.5" dia tire on 5300lb vehicle with an assumed static friction coefficient of 1.0; total mutlipled torque applied to rear axle of 30,000 ft*lbs; axle retained by 3 attachment points with lower links held at 'theta' angle to the horizontal and upper link held at angle 'phi' to the horizontal can produce a 'static' force of blahblahblah lbs at the tire contact point. Assuming a possible dynamic multiplier of 2.5 means......

Ummmmm, Yup!
You can break everything.

ChicksDigWagons · Oct 6, 2004

COXJ said:
about what is the sheer strength of a 7/16th (grade 8?) it has 6 lines on the top with a u between them. this is for my single torq arm wich is in doubble sheer withe the load spread evenly. thanks

Liam

You're using a 7/16th bolt for a single attatchement point style suspension? Doesn't that seem kinda small?

COXJ · Oct 6, 2004

thats what i was thinking but it is the setup currie runs on one of his own rigs so i am asuming it will work thats why i ask.

liam

COXJ · Oct 6, 2004

one other thing this is a currie jonney joint that i am using and by the looks of it i may be able to drill it out to maby 1/2 in. i dont have any experence with jonney joints so yall tell me ya or nay. also 7/16 is the size of the stock hardware that is used on the upper controol arm mounts from the factory.

XJJPR · Oct 6, 2004

COXJ said:
thats what i was thinking but it is the setup currie runs on one of his own rigs so i am asuming it will work thats why i ask.

liam

Are you talking about the upper link on the Currie front three link suspension?

If so they use 9/16" bolts thru the 2.5" Johnny Joints, Not the stock 2" JJ size.

hinkley

COXJ · Oct 6, 2004

um maby? he uses one upper controll arm on the driver side with a joint that preses in to the cast mount on the pumpkin going to the stock UCA mount. how would he have fit a 2.5 in there? i will call currie tho

WIll

ChicksDigWagons · Oct 9, 2004

Yeah, thats definately something to double check. 7/16th seems like an aweful small bolt for anything you don't want breaking on you!

bolt sheer strenght

COXJ

NAXJA Member #989

Bender

NAXJA Forum User

Dirk Pitt

Adam Dowling

C-ROK

NAXJA Forum User

XJJPR

NAXJA Forum User

C-ROK

NAXJA Forum User

ChicksDigWagons

NAXJA Forum User

COXJ

NAXJA Member #989

COXJ

NAXJA Member #989

XJJPR

NAXJA Forum User

COXJ

NAXJA Member #989

ChicksDigWagons

NAXJA Forum User

Similar threads