scutter
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| posted on 26/1/12 at 02:45 PM |
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Threaded bar pull strength
Ok people, does anyone know what the pull strength of a 5/16" threaded bar would be?
Working on 1 1/2 Dia thread engagement, I'm thinking of using it for my anti-rollbar droplinks.
ATB Dan.
The less I worked, the more i liked it.
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tegwin
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| posted on 26/1/12 at 02:49 PM |
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How long is a piece of string?!
It all depends what grade of metal it is made from and what process has been used to form the thread (rolled, cut etc)
If you are just talking abut off the shelf studding... I would not! Better off with a piece of suitable steel with suitable rod ends screwed in/on to
it.
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daviep
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| posted on 26/1/12 at 02:49 PM |
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Depends on grade and thread pitch.
Davie
A truly great library contains something in it to offend everyone.
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Litemoth
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| posted on 26/1/12 at 04:10 PM |
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Grade 8:8 steel would be 800 Newtons per square mm.
For example ...here's a metre of M12 for four and a half quid-ish
LINKY
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britishtrident
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| posted on 26/1/12 at 04:26 PM |
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At 5/16" thread dia you really need internally threaded drop links as a length of 5/16" threaded rod will buckle in compression
McGill Motorsport shop on eBay will sell you ready made adjustable drop links in various sizes for very little money.
Alternative get a couple of long drop links for a tintop and set to work with a suitable thread cutting die (look at Rover 75 front drop links on
ebay but beware poor quailty ones the rubber dust boots are crap.
To join a RH male thread to another RH male thread you can use a special very long nut called a Studding connector you can buy them fom Wickes
Stores or off ebay. These days you can only get them in standard metric threads.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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MikeRJ
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| posted on 26/1/12 at 09:52 PM |
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quote:
Originally posted by Litemoth
Grade 8:8 steel would be 800 Newtons per square mm.
For example ...here's a metre of M12 for four and a half quid-ish
The typical "all thread" that you get from B&Q etc is nowhere near 8.8. It's actual grade is somewhere between Brie and
Camembert.
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britishtrident
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| posted on 26/1/12 at 10:13 PM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by Litemoth
Grade 8:8 steel would be 800 Newtons per square mm.
For example ...here's a metre of M12 for four and a half quid-ish
The typical "all thread" that you get from B&Q etc is nowhere near 8.8. It's actual grade is somewhere between Brie and
Camembert.
Well below Stinking Bishop on the Wallace & Grommit tensile test scale then :-)
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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hillbillyracer
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| posted on 27/1/12 at 12:00 AM |
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Yeah, we keep it at work & some folk say it's expensive, it's cheaper from so & so, but it's 8.8 grade & the others
likely aint.
As said it's not the tensile strength you need to worry about, the same force will be in compression on the other link & the bar will bend
under far lower compression loads than stretch/snap under tension.
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scutter
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| posted on 27/1/12 at 10:57 AM |
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Cheers folks, I'd forgotten about compression for some reason, looks like a piece of hex bar is gonna get some attention.
ATB Dan.
The less I worked, the more i liked it.
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britishtrident
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| posted on 27/1/12 at 12:12 PM |
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Hex bar is relatively expensive then you have face it off drill and tap it as already said you can buy in ready made but also you weld or
braze threaded inserts in to plain tube. Both ready made links and inserts are easily and cheaply available off ebay.
Also I would sugest 3/8" UNF as 5/16" would only be suitable for short links and softer anti-roll bars.
Link
toMcGill eBay shop.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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scutter
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| posted on 27/1/12 at 12:31 PM |
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Cheers, I'm playing with 5/16 as i've already got the rose joints.
What do we think of running some good quality studding inside a piece of steel tube and welding it in situ?
I'm only looking at 1 1/4" between the ends of the 2 rose joints.
ATB Dan.
The less I worked, the more i liked it.
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DIY Si
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| posted on 27/1/12 at 03:24 PM |
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If it's such a short length, could you not just cut the head off a bolt?
Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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britishtrident
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| posted on 27/1/12 at 03:47 PM |
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No I understand, you have female threaded rose joints ? At such a short length you will probably get away with threaded bar, but I would cut
down a fully threaded Grade S set screw rather than iffy tensile threaded bar.
Grade S is a close equivalent of metric HT grade 8.8
Don't weld to high tensile bolts it is just asking for failure.
Namerick will sell you decent quality 5/16" dia 3" long UNF machine set screws
http://www.namrick.co.uk/acatalog/Home_U_N_F__HT_Hex_Set_Screws_17.html
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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scutter
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| posted on 29/1/12 at 04:51 PM |
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Hmmm, I wonder if the aircraft has any 5/16 screws Looking at 2 1/2" in total so it's an idea.
Cheers folks.
The less I worked, the more i liked it.
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