Grade 8 bolt question?
Senior User
Joined: Mar 2004
Posts: 448
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no
grade 8 is the same size as other bolts, so the threads will not be damaged
you can however damage things if the correct torque for the application is ignored
grading is not only the hardness, but mainly the tensile strength............you can drill holes in grade 8 bolts with standard HSS drills, for safety wire/cotter pins
grade 8 is the same size as other bolts, so the threads will not be damaged
you can however damage things if the correct torque for the application is ignored
grading is not only the hardness, but mainly the tensile strength............you can drill holes in grade 8 bolts with standard HSS drills, for safety wire/cotter pins
Posting Guru
Joined: Nov 2003
Posts: 1,230
Likes: 0
From: East Flat Rock NC
Arnold Kenyon
I've never really gave it much thought, but I have had trucks that seemed to
go though the cheap starters, and have to change three a week of the ones
they call life time! So I started putting " STUDs" in, and used good lock washers and new nuts anytime its pulled!
P.S. Sure makes a starter install go real fast, I really like this method.
Wally Womack
I've never really gave it much thought, but I have had trucks that seemed to
go though the cheap starters, and have to change three a week of the ones
they call life time! So I started putting " STUDs" in, and used good lock washers and new nuts anytime its pulled!
P.S. Sure makes a starter install go real fast, I really like this method.
Wally Womack
Posting Guru
Joined: Nov 2003
Posts: 1,230
Likes: 0
From: East Flat Rock NC
Arnold Kenyon
The studs I've used, I always just tried to match them up, In the Past I have
kept the studs less than 3 inch. They sure help hold the starter, while starting
the nuts! If you ever had to change the starter more that one a day they are
priceless,
Wally Womack
The studs I've used, I always just tried to match them up, In the Past I have
kept the studs less than 3 inch. They sure help hold the starter, while starting
the nuts! If you ever had to change the starter more that one a day they are
priceless,
Wally Womack
Senior User
Joined: Sep 2005
Posts: 359
Likes: 1
From: Saint Paul, MN
Just remember to use anti-seize on all bolts that thread into aluminum. After time the chemical reaction between the two different metals will gall the threads. I learned the hard way. I used a distributor hold down bolt in an aluminum manifold without anti-seize. After time I was able to pull the bolt straight out without turning it. The aluminum threads were stuck to the steel bolt.
Thread Starter
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Senior User
Joined: Nov 2004
Posts: 413
Likes: 0
From: Enid, OK
That may be what happened to the threads in the transmission. The threads pulled out and I had not tightened the bolt up enough to justify that. I guess it is time for the heli coil.
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Senior User
Joined: Sep 2005
Posts: 359
Likes: 1
From: Saint Paul, MN
I couldn't even use a heli-coil. One day I bumped my distributor and it moved. I turned the bolt but it wouldn't tighten. When I pulled it out, it looked like someone had drilled a hole. No threads. I had to tap to the next size. What a PITA pulling the intake just to tap one hole. I use anti-seize from now on.
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