Fine thread or coarse thread bolts ?
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Senior User
Joined: Feb 2004
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From: new jersey
Fine thread or coarse thread bolts ?
I am going to use Stainless steel bolts to reassemble my truck and was wondering what i should use, fine thread or coarse thread, i can get the coarse thread bolts for free from work, but would have to pay for the fine thread. I guess what i'm asking is does it really matter which one i use, and also should i use teflon lock nuts or lock washers.
thanks, 54 fever
thanks, 54 fever
Cargo Master
Joined: Nov 2004
Posts: 2,858
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From: Friendswood, Texas
Depends on what you are using them for. If it was fine thread, I'd go back with fine thread. If it was course thread, no problem with course thread. Do you know waht grade stainless you will be using. I'm assuming it is a 300 series which should not be a problem. If it happens to be 410SS bolting, use 304SS nuts to prevent gauling (did I spell that correctly?) of threads.
"Mifflin Clay"
Joined: Jul 2005
Posts: 3,177
Likes: 4
From: Mifflin, PA
Originally Posted by texan2004
Depends on what you are using them for. If it was fine thread, I'd go back with fine thread. If it was coarse thread, no problem with coarse thread. Do you know what grade stainless you will be using. I'm assuming it is a 300 series which should not be a problem. If it happens to be 410SS bolting, use 304SS nuts to prevent galling (did I spell that correctly?) of threads.
In non-critical applications like brackets, doesn't matter much which you use.
Fleet Owner
Joined: Jul 2004
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From: NM
Fine threads are generally more vibration resistant, but you'll likely be using lockwashers anyway, right?
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Senior User
Joined: Mar 2003
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From: South Central MN
Fine threaded bolts will keep things tighter longer, and when i went to pull all of mine out, such as the running board brackets, none of them were really stuck or rusted at all....but if you use a decent quality coarse thread with lockwashers or possibly even lock-tite depending on the application, you will be just fine.....
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Postmaster
Joined: Jun 2004
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From: Riverside, So Cal
54 -
For use on our trucks, either fine or coarse threads will work fine. Fine thread bolts have a higher tensile strength, but we don't really need that in chassis work.
I like to use nylok nuts for most everything. I don't trust lock washers. The nylocks stay there even if they should loosen (or I forget to tighten them). The only time I don't use nyloks is where wrenching them off is really a drag, like up inside the front fender/air dam connections where you can only get 1/4 turn on a ratchet.
For use on our trucks, either fine or coarse threads will work fine. Fine thread bolts have a higher tensile strength, but we don't really need that in chassis work.
I like to use nylok nuts for most everything. I don't trust lock washers. The nylocks stay there even if they should loosen (or I forget to tighten them). The only time I don't use nyloks is where wrenching them off is really a drag, like up inside the front fender/air dam connections where you can only get 1/4 turn on a ratchet.
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Senior User
Joined: Feb 2004
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From: new jersey
Thanks guys, I thought the coarse bolts would work ok, just wanted to double chek with my forum buddies. i like free also, and i can get the teflon lock nuts and anti- seize free to.
Hotshot
Joined: Oct 2004
Posts: 15,882
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From: Durham NC
Use the lock nuts anywhere you do not plan to loosen/remove them many times. If you reuse nylocs more than a couple times they stop holding. I've been replacing any and all bolts with SS button heads and am using course threads anywhere they are not going into a prethreaded hole. I am using lock washers for the most part because I expect to be removing them several times during this phase. Once I am satisfied they are not coming apart again I'll use nylocs.
Laughing Gas
Joined: Apr 2003
Posts: 936
Likes: 25
From: La Ronge Saskatchewan
I like to use fine thread, but for high torque requirements i use course.
I definanatly use fiber loc nuts, lock washers scratch the paint underneath (unless you need a good ground)
I definanatly use fiber loc nuts, lock washers scratch the paint underneath (unless you need a good ground)
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