What grade bolts should be used when replacing
bolts on a farmall to be strong as the factory bolts? I
was thinkin the factory bolts were somewhere along
the lines of grade 8 but if someone has some more
information, Thank you
 
On my 400 and 450 and H the bolts I can see are grade 5. But depending on where the bolts are that you want to replace are would determine the hardness.
 
Well im wantin to replace the bolts that bolt the axle to the transmission when i put a new seal in. Isn't grade 8 stronger than grade 5 and dont you tell the difference by how many lines that are on the head of the bolt?
 
It goes grade 2 then 5 then 8 and 8 being he strongest but also the one that is the brittlest. I just did a split of a 656 and the transmission to TA bolts where grade 5 going by the lines on the bolt heads. No lines grade 2 3 lines grade 5 and 5 lines grade 8 from what I understand
 
There is no modern replacements for original factory hardware. Even the height of the hex part of the bolts was slightly taller back then and had more room for a wrench. Manufacturers went to alot of trouble to assure quality fasteners. Nothing like the ones that came off the machine.
 
So from the comments I recieved im guessing that most people that are restoring just clean up the factory bolts and reuse them on the installing of the parts back on is this true?
 
Yes Trent,Most folks(me included) just clean up the old ones and reuse.Wire brushing is all they need.In the event there are a few 'munched' threads,just 'chase' em with a die.Look at the surrounding bolts to determine wich is the correct hardness if it really matters or is a concern.
 
Here's a chart:

http://3.bp.blogspot.com/_lKcUC9OO9E0/SoOHtOCxRKI/AAAAAAAAAQM/5gOY4gxZZsw/s1600/Grade%2BIdentification%2BMark%2Bof%2BBolt%2B%26%2BScrews-740196.jpg

Unless your bolts are rusted or the heads rounded, they can be reused. Cleaning with a wire brush is acceptable. Taping the holes is a good practice. Be careful running a die on them though! The threads are rolled on, not cut, chasing them with a die can undersize them!
 
(quoted from post at 13:42:57 05/29/15) What grade bolts should be used when replacing
bolts on a farmall to be strong as the factory bolts? I
was thinkin the factory bolts were somewhere along
the lines of grade 8 but if someone has some more
information, Thank you

Trent its never a good Idea to replace bolts with greater strength or less strength. Bolts have different applications. There are tension bolt and shear bolts, both have a reason for being there. Some bolts are designed to shear off rather than damage your tractor its really on a case by case basis. Most tension bolts have fine threads more threads per inch the head is typically larger and the nut will be wider or taller to accept more threads. As with any bolt and nut combination a 1 1/2 to 2 threads protruding outside the nut or nut plate After torque is a minimum requirement. If you don't know use your original Bolts
Hope this helps Byron
 
Thank all yall for your comments and help I will be using the factory bolts cleaned up with a wire wheel I heard that if takin to bare metal with a wire wheel that coating the threads with a light coat of clear plastic paint to not have them rust again is not a bad idea or is it?
 
I sometimes restore old Harleys and the bolts are all marked and made by Chandler Products [1038 CP] . Changing out the original hardware devalues the machine considerably.
 
I would not paint them since it is likely to make them stick and be hard to pull out if you ever have to remove them again. A bit of oil or grease but not paint
 
(quoted from post at 21:10:58 05/29/15) Thank all yall for your comments and help I will be using the factory bolts cleaned up with a wire wheel I heard that if takin to bare metal with a wire wheel that coating the threads with a light coat of clear plastic paint to not have them rust again is not a bad idea or is it?

Trent, just think about how far your tractor was assembled before painting. Usually they were assembled except for sheet metal, wiring, linkages, seat and steering wheel. Everything else, fasteners included was all painted at the same time. If you need bling, most hardware stores carry some chrome fasteners. I have not seen what hardness they are.
 
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For the few cents difference, just slam grade 8's in and go. At least you know it's not gonna break off. Most of the grade 5 wanna be stuff from places like Tough S@#t Charlie's or where ever are likely bottom of the spectrum shizz. It's like our gasoline, high test now is the same as regular 25 years ago.
 
Should I even add oil to them or should I jus take them down to bare metal with a bench grinder with a wire wheel on it and screw them back in? Im jus wonderin what everybody else normally does?
 
My self I like to put just a touch of grease on them so that they do not rust in place
 

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