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DOM tubing vs. standard tubing

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Philly87

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Is there a difference? :confused:

School away please as I'm ready to buy the tubing for the cage.

Thanks,
Phil
 
Philly87 said:
Is there a difference? :confused:

School away please as I'm ready to buy the tubing for the cage.

Thanks,
Phil
Click to expand...



Have you tried a search on this subject? There is a ALOT of threads on DOM tube vs seam welded tube for cages. It's the great debate. Try that before we start the 7,053,729 thread on this subject. :D :haha:
 
Yeah the search feature will help you find your answer and more than you prolly want to know but the difference between DOM (drawn over mandrel) and HREW (hot rolled electric welded) is that the inside diameter of the DOM is the same throughout the length of the tube and it doesn't have a seam down the inside like HREW. Tube starts out as a flat plate and is bent and welded into tube.

I've got DOM and HREW on my cage. I'm working on another chassis for a single seater buggy and it will be all HREW. It really depends on what the prices are at the time I buy. Sometimes DOM price gets way above HREW and sometimes its close to the same. When stock is low at my supplier the price goes down.
 
Can we argue about pipe v. tube? I really think we need another endless debate about that one. :D
 
I'll try doing a search...

Right now I can get a 20 foot stick of 1 3/4" .120 wall for $32 a stick.

Fair price? It's not DOM.
 
One point that usually isn't debated is that DOM is better and often a requirement in professional racing/sports. If DOM is comparibly priced, use it. The argument seems to be whether HREW is good enough and whether the seam makes it more difficult to bend in some cases.
 
Philly87 said:
Is there a difference? :confused:

School away please as I'm ready to buy the tubing for the cage.

Thanks,
Phil
Click to expand...

HREW (Hot Rolled Electric Welded) and DOM (Drawn Over Mandrel) are made from the exact same material. Both start life as flat plate and then are rolled into a tube and welded. The difference now is that one is drawn over a mandrel which smoothes the inside seem and makes the thickness consistant throughout the length of the tube. DOM is slightly stronger because of this process but that brings on extra cost because of the extra work.

I would buy DOM if the price isn't that much more than HREW. Keep in mind that the more you buy you usually will get a better price structure. Plan on at least 100 feet to do a family style cage with minimal waste.
 
4X4HIGH said:
HREW (Hot Rolled Electric Welded) and DOM (Drawn Over Mandrel) are made from the exact same material. Both start life as flat plate and then are rolled into a tube and welded. The difference now is that one is drawn over a mandrel which smoothes the inside seem and makes the thickness consistant throughout the length of the tube. DOM is slightly stronger because of this process but that brings on extra cost because of the extra work.

I would buy DOM if the price isn't that much more than HREW. Keep in mind that the more you buy you usually will get a better price structure. Plan on at least 100 feet to do a family style cage with minimal waste.
Click to expand...

Scott chimes in with correct info. Both are seamed tube.

The other place where DOM can be stronger is that often they use a better grade of steel when making DOM.

Rene
 
In racing classes that allow both the use of HREW or DOM, you can always use a thinner piece of DOM vs HREW, typically if you are required to use .120 HREW you will be allowed to use .083 DOM, this in and of itself says something about the additional strength of DOM.

DOM is more dent resistant than HREW mostly because of the additional process used to create DOM.

In the real world I tell folks who ask me this, an HREW cage (assuming built properly) will save your life in a hard roll once. A DOM cage will probably survive that roll over and go on to save your butt once or maybe more than once.
 
blazinzuk said:
In racing classes that allow both the use of HREW or DOM, you can always use a thinner piece of DOM vs HREW, typically if you are required to use .120 HREW you will be allowed to use .083 DOM, this in and of itself says something about the additional strength of DOM.

DOM is more dent resistant than HREW mostly because of the additional process used to create DOM.

In the real world I tell folks who ask me this, an HREW cage (assuming built properly) will save your life in a hard roll once. A DOM cage will probably survive that roll over and go on to save your butt once or maybe more than once.
Click to expand...

Are you sure you aren't thinking of chromoly? What you said holds true in drag racing between chromoly and mild steel.
 
4X4HIGH said:
Are you sure you aren't thinking of chromoly? What you said holds true in drag racing between chromoly and mild steel.
Click to expand...

Time attack cars and road racing stuff.

Most rules allow you to run thinner tube if you go with DOM, you can run even thinner if you go with chromoly.

I know drag racing the rules are different( still haven't done a drag car cage) but I have done a couple SCCA type racers and a couple time attack cars
 
i dont even think erw is allowed in scca after 1994
 
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