Will High Tensile bolts rust

Richard
Rockape's advice is spot on. Just follow his instructions and all will be well.
Skip

Rockape,
They are those brassy looking ones.

At the moment it is a temporary arrangement as it is a bit of a test case but I am thinking of doing something a bit more semi permanent so want to know if this is a good option.


Thanks for your reply, I will definitely spray some anti rust stuff on the them as they will be in for a few weeks if not longer.

Richard

Regardless of whether they are black, galv or zinc the exposed ends will get sandblasted under the car and rust.

My suggestion is Permatex No3 non-hardening aviation gasket sealer. I use it on every threadthing.

Carlsp,'
At least the mushrooms grow well :)

Richard

I have never seen high tensile stainless bolts, are they grade 8 stamped.

I work in the marine industry and havent come across PROPER HT SS bolts.
Problem with SS bolts is that it stretches under tension, more than carbon steel and when it stretches thread pitch changes leading to galling/binding.

Id suggest in your circumstance that HT is pointless as they are only as good as the thread they are going into, Im surmising they wont be anything special.

Fisho,
The nuts he is bolting into are HT as they are for the seats

May be if I explained what I was doing.

I took the back seat out to fit more things in - I have a SWB Pajero so nee dthe room.

One of the things I have is a box - a plastic one from Super Cheap at the moment which I strap down vai a ratchet strap.

As the number of tie down points are limited in the SWB or in useless places I have in the past attached a couple of angle brackets to the floor using the same holes as I am now. As the brackets were small I could use the same bolts as used fior the seat. They look like stainless steel. These bolts are M10 with a pitch of 1.25.

The only bolts I could find with the above specs were the high tensile ones I have mentioned.

So instead of strapping it down I decided to just bolt the box to the floor. If it goes well I will replace it with a metal and stronger box.

For now it seems Ok but want to confirm the bolts I am using are good for the job and rust is one of the issues I was concerned about. I will not leave the box in permanently as do want to put the back seats in sometimes but it could be there for months at a time.


RIchard

yeah I know they are for the seats, but as theyb are usually just spot welded onto the underside of the chassis sheet metal from memory, plus they dont actually hold the passengers weight Id be suprised if they were grade 8.8.

maybe your right, not important any way.

Richard-yes HT bolts will rust but as said before do as rockape said and coat them and theyll be there long after the car is gone!

Stainless sell will sove one problem but will create another one so dont go there.... (worked on pearl boats as a mech before you ask !!!)
Unless you plan to keep the car for a zillion years just give em a spray with all the "stuff" listed above and forget it, after all if you can still remove a bolt on a car that is 17 years old and it is original without any "sprays" from the factory you will have another 17 years left before ya have to worry ......
If they are "gold" looking they will be good, anodised will stop rust, the "grade" wont make squat differance to rusting and for normal use a standard grade bolt will be fine....

To all.
Many thanks for the great and VERY quick responses.

I hunted around the net for some time to get an answer to this before posting here.

I did not get the answer from the net but have certainly got one from here.

So once again thanks you you all,
Richard

In the back of my mind I seemed to remember that some High tensile bolts are not good when there is possible metal fatigue as constant vibration can bleep ter the bolt. Ie they do bent or stretch, they just break.

Honky

The Bleep took out part of the word which was not swearing.
The word was what happens when you drop say a glass or light bulb.
At least it left the "ter" in
Honky

Hello,
It seems to me that hi tensile bolts in this instance are probably overkill. If you are worried by possible rusting do as rockape says and they will be fine. The brassy look is some kind of electroplating which would offer some protection. To hunt up stainless hi tensile bolts to hold a box down would be serious overkill. A quick spray with Lanotec would do the job.
Guy

David,
I coated them withe some Laolin for now.

RIchard

No - not sure if I want to be :).


These are the back seats.

I think many people have done this.

The seats in the Paj fold up any way so am not doing much more.

Richard