Can Rust Free Machine Screw be Shortened And Still Be Rust Free?

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Forum topic by stefang posted 04-26-2013 05:27 PM 2967 views 0 times favorited 21 replies Add to Favorites Watch
View stefang's profile


16347 posts in 3599 days

04-26-2013 05:27 PM

I would sure appreciate some help with this. Thanks.

-- Mike, an American living in Norway.

21 replies so far

View madts's profile


1887 posts in 2604 days

#1 posted 04-26-2013 05:32 PM

If it is made from stainless steel, then yes. Otherwise no. Use NeverSeize or loctite on the end for protection.

-- Thor and Odin are still the greatest of Gods.

View Loren's profile


10477 posts in 3912 days

#2 posted 04-26-2013 05:38 PM

Or brass.

Standard zinc coated screws and bolts will rust where you
cut or grind them. If it’s just for aesthetic reasons and
a stainless screw is not available, the end can be polished
and coated with a little lacquer or maybe shellac.

View Jim Jakosh's profile

Jim Jakosh

22043 posts in 3370 days

#3 posted 04-26-2013 05:49 PM

If they are rust free, does that mean stainless? Most regular steel screws will rust if left outside in the elements- except good quality high nickel stainless. If you cut them off then they will rust faster because it is raw. You could paint the end with a good silver paint or put an acorn nut on it to seal the end.


-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View MeanGene's profile


15 posts in 3235 days

#4 posted 04-26-2013 06:47 PM

“Rust -free” are typically steel screws coated with zinc. If the coating is scraped of or exposed (cut end), the exposed area will rust. Coating the exposed area with paint or a rust inhibitor will help. But any iron product will eventiuallly rust when exposed to moisture for a prolonged period. Stainless screws contain a percentage of chromium and nickel which make the screws rust resistant throughout, not just on the surface of the screw.

View junebug's profile


102 posts in 2669 days

#5 posted 04-26-2013 07:59 PM

can always spray the ends of the screw with this and see how it works!!

We use an industrial version of this product with good results at work

View stefang's profile


16347 posts in 3599 days

#6 posted 04-26-2013 08:08 PM

Thanks to Madts and Loren.

Jim and Gene I’m talking about the stainless steel ones. I know from experience that they can still rust some eventually, but I suppose, like you say Jim, that the rough surface where it’s cut will just rust faster than the rest it if it isn’t protected with some surface coating.

This came up because my son is revamping a unique bike he got some years ago which was a prototype with a special aluminum frame. It is pretty cool. He is mounting even higher quality components on it and also hydraulic brakes, and the assembly for that is where the screw will be used. Unlike myself he is extremely particular with even the smallest details of what he is doing. I admire that, but I get a lot of questions, some of which I can’t answer, like this one. So I appreciate the help.

-- Mike, an American living in Norway.

View stefang's profile


16347 posts in 3599 days

#7 posted 04-26-2013 08:11 PM

Thanks Junebug, I can’t get it in Norway.

-- Mike, an American living in Norway.

View Dave's profile


11429 posts in 3104 days

#8 posted 04-27-2013 03:07 AM

Mike place the highest polish on the part you remove. This will prevent it longer.

-- Superdav "No matter where you go - there you are."

View stefang's profile


16347 posts in 3599 days

#9 posted 04-27-2013 08:17 AM

Dave, but if I polish the part I remove how will that help the part to be used?, Lol. Thanks Dave I do get it and I will do it.

-- Mike, an American living in Norway.

View Tim Dahn's profile

Tim Dahn

1579 posts in 3829 days

#10 posted 04-27-2013 10:49 AM

Stainless surgical instruments are protected from there harsh environments by a process called passivation (also called pickling), read here about Passivation of stainless. It seems the key here is to be sure the end of the bolt/screw has no contaminants and is polished passivation, can be done with citric acid.

-- Good judgement comes from experience and experience comes from poor judgement.

View stefang's profile


16347 posts in 3599 days

#11 posted 04-27-2013 12:00 PM

Thanks Tim. The job is already done. Luckily I didn’t have to cut off much, so I was able to do it very accurately on the grinder. After grinding, I polished the ends to a chrome like finish just as you suggest.

-- Mike, an American living in Norway.

View Dave's profile


11429 posts in 3104 days

#12 posted 04-27-2013 12:47 PM

Mike sorry I speak redneck, sorry. You get it. ;)

-- Superdav "No matter where you go - there you are."

View BertFlores58's profile


1698 posts in 3187 days

#13 posted 04-27-2013 01:52 PM

During my days as worker on ship engine, stainless steel is pure when you can not magnetize it though there are so many grades of strentgh. Alloyed with chrome and vanadium will rust but it is really strong that the rust will not destroy it in years. As long as the bolts or nuts are tight, it will not rust inside but those exposed to air will rust or corrode due to age. A simple coat of any sort that will prevent exposure to air then there will be no rust. Watch for those coated metals… even rethreading or just filing the bolts or nuts, the coating will be destroyed. In your place, take A2 type of stainless steel, markings on the bolts or packets will class it. Also try to use magnets.

By the way, scissors are classsed stainless steel, but they are magnetized because of hardening and tempering.
Hope this would help you.

-- Bert

View MrRon's profile


5351 posts in 3508 days

#14 posted 04-27-2013 03:47 PM

You could also use titanium, K-monel or CRES, Cl 304, cond A.

View stefang's profile


16347 posts in 3599 days

#15 posted 04-27-2013 05:15 PM

Thanks Bert and Ron. The jobs done, but I did learn a lot from you guys. I don’t know much about wood and even less about metal, so it always good to have a little more knowledge for future reference.

-- Mike, an American living in Norway.

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