AndyMark 3/8-16 x 7 Hex Head Bolt bending

[IndySam]

Originally Posted by FrankJ

I am pretty sure they are just a grade 5 bolts. I am are pretty sure they are what we used for our 2010 Break Away chassis axles. If so we have been pretty abusive & they have held up.

I'm pretty sure he meant 7" and not grade 7.

[Mk.32]

We have bent the KOP bolts in the KOP long configuration before [8inch wheels, Logomotion lots hard driving]. After we realized this we got some Grade 8 bolts and didn't have any problems.

Originally Posted by Mk.32

We have bent the KOP bolts in the KOP long configuration before [8inch wheels, Logomotion lots hard driving]. After we realized this we got some Grade 8 blots and didn't have any problems.

Do you have any grade 8 bolts you'd suggest using?

[AdamHeard]

Originally Posted by SuperNerd256

Do you have any grade 8 bolts you'd suggest using?

Grade 8 is a rating, not a brand. So if you find anything marked grade 8, you're fine.

Home Depot might have them, unsure. Any industrial supplier should

Socket Head bolts aren't grade 8, but are similarly strong.

[Phyrxes]

Quick check of Mcmaster shows part #91257A650 is $12.13 for a 5 pack of grade 8 bolts if you don't have a local industrial supplier.

Originally Posted by Phyrxes

Quick check of Mcmaster shows part #91257A650 is $12.13 for a 5 pack of grade 8 bolts if you don't have a local industrial supplier.

This is exactly what i needed. Thanks!

[MrForbes]

We used the kit chassis for logomotion, we bent the long bolts that hold on the wheels. That aspect of that chassis is not a very good design, if your robot is going to do things like drive into a wall with it's arm extended. The load of the robot falling back onto it's wheels will bend the axles.

Using a higher grade bolt might fix the problem, but it's still not a very good design.