what is N.m (lbf)

[treebing]

What do you understand to mean in regards to a bolt for double shear strength. (like in a clevis type situation).

581.9 N.m 5150 lbf

what is that mean.

 

[Colin]

Newton meter? just a guess....

 

[Blinky]

Newton-meters or foot-pounds. It's a torque specification.

 

[treebing]

how does torque relate to strength of a bolt. would this bolt be safe to climb on? its above 5000 foot pounds.

 

[Worthaug]

In rock climbing anchors are expansion syle bolts with 25kn rated hangers hanging from them, the bolts are designed to resist 30 to 50 newton meters of force when embedded in 3000 psi concrete. I would think this pertains to shear and pull out strength, see Petzl's P32 P33 and P38 Stainless steel anchors

According to these numbers I would say you could hang a pick up truck form the bolts you're describing.

 

[treebing]

thats cool, they are only 3/16" bolts which is pretty slim. but I guess the axles of those pulleys are not that big either.

 

[trevmcrev]

To me a torque spec would relate to rotational strength, eg, at what force would it shear when tightening.

While it sounds super high, it might/might not be indicative of loads applied to it in other directions.

So if the question is: How tight can this bolt be done up, you have an answer.

If the question is what load can i hand off this bolt, you dont have the answer.

 

[trevmcrev]

To me a torque spec would relate to rotational strength, eg, at what force would it shear when tightening.

While it sounds super high, it might/might not be indicative of loads applied to it in other directions.

 

[treebing]

its actually a quick release pin, its not a threaded bolt that gets tightened. the figure is for double shear strength Ill try to get a picture

 

[Blinky]

OK I thought you were talking threaded. I don't know then, I've only seen them applied to torque.

 

[Worthaug]

Newton-meters or foot-pounds is commonly seen in a torque situation but it can be applied to any energy where a force vector is used in combination with a displacement vector (pounds and feet). Foot Pounds

 

[surfarmer1]

look up definitions to foot pounds or newtons per meter in reference to torque... look up definition to shear strength and how it relates to applied science..on common bolts the top of the bolt has hash marks on the top which gives you a grade or shear strength..as far as clevis pins go where as the bolt goes throgh a section and then threads into another section the strengh is very large but to be sure I would check with the manufacturer