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best material for making new trailing arms

General Tech Talk

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best material for making new trailing arms

Post by Snarba »

Hi all what the best size and type of material for making nu trailing arms. I want to make longer ones and have them bent down near the end that joins the diff. tah
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Post by dreamz »

somthing unbreakable mate, ive snaped 2 in the last 2 weeks :oops:
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Post by Slunnie »

I reckon anything unbreakable also. I ended up buying 50x25 MS tube and will make them a little later. I'll be pissed if that stuff gets bent. :lol:
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Post by BIG GQ »

4140
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Post by Snarba »

is 4140 tube? is it steel or alloy? what dimensions? sorry I just wanna arm myself with the facts before I go out shopping ;)
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Post by HotFourOk »

4140 is an alloy with chromium, molybdenum, manganese low alloy steels noted for toughness, good torsional strength and good fatigue strength. :D

It usually is supplied in Tube... should be able to get solid bar tho, depends what you want.
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Post by ludacris »

What is the going price for a length of 4140.

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Post by slowhilux »

Made mine out of 45mm O.D, 6.5mm wall thickness chromoly. All the paint is missing from the underside, still straight tho
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Post by awill4x4 »

Chrome/Moly 4140 is generally used as a machining grade material in hollow and solid bar. Tube sizes of Chrome/Moly are 4130 grade.
If anyone needs 4130 Chrome/Moly tubing in Vic, the place I work for is probably the largest user of 4130 Chrome/Moly in Vic outside of the defence department.
Be aware though, that there is some cheap Chinese and Indian tubing in the market, we only use American or German tubing tubing to what is called a "Mil T" spec condition N. (suitable for military and motorsport use)
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Post by ludacris »

What is mecaval or something like that.

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Post by just cruizin' »

4140 is used for pump shafts etc and is available in most common sizes of solid bar and hollow and would be available from most speciality metal suppliers such as Interlloy 3344 3300 and what was called Assab 3375 5801 now Bohler something
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Post by X-Eng »

4140 is a good material, but more difficult to weld (properly!) than mild steel.

I would be inclined just to go for steel CDS tube as used for cages & frames. Very easy to work and so long as it is big enough with sufficient wall thickness, plenty tough enough.

Mine are 1.5" diameter, 0.25" wall - and I've never had a problem.

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Post by mud4b »

i have used 41mm solid for my rear link arms (1.2m long) and 45mm od hollow bar for the front (10mm wall, just over 1m in length).


the rear links are used for sliders and have gouges in the bottom but have never bent.

the front ill let you know as ive only just done it and have not used em yet.
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Post by Snarba »

thanx everyone.... :D
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