shear bolts

Dieseltech

Well-known Member
Location
Akron, Indiana
Has there ever been a comparison chart for shear bolts in 1/4, 5/16, and 3/8 inch size of grades 2, 5, and 8? Would be interesting to compare size 3/8 grade 2 with 5/16 grade 5 for example.
 
You'd need to know the difference between shearing through the shank or the threads too.
 

Quick look says no shear strength charts but use 60% of tensile strength.

3/8 grade 2 tensile 5270# x60 is 2910# shear.

5/16 grade 5 tensile 6968# x60% is 3774# shear.

So the 5/16 is higher with grade 5
 
Lots of variables too.

Are the tests with shear blades or real life holes?

How much clearance?

How sharp are the edges of the holes?

After a few shears and the holes are wallowed, will it get easier to shear, or the rounded edges make it harder?
 
The decal on my baler says grade 8 if shearing through the threads, grade 5 if shearing through the shank.
 
It's an odd set up. It only has a hole drilled through the driven half. The drive half has a slot in it. If you put the bolt in from the front, the drive side runs against the head and shears the shank. If you put it in from the back, it runs against the nut and shears the threads.
 
I'm not sure a chart would show what I like about using Grade 2 rather than 8.....and my using a self locking nut and leaving slop between the machine and the securing mechanism.
 

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