Home made Roll cage steel question

Discussion in 'Track Prep & Tech' started by 10mm socket, Sep 19, 2017.

  1. 10mm socket Paid Member Paid Member

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    Morning guys and gals,
    I'm considering building my own roll cage to msa /fia regs. I see the minimum steel type they req is cold drawn steel with a minimum strength yield of 350 N/mm2, I can get some quality cold formed steel tube s355 grade with a yield of 355 N/mm2.... a high strength constructional / mechanical tubing.

    I see it like this, they are asking for strength and this cfs is stronger than there minimum standard.

    Please discuss
     
  2. Jon Olds Forum Junkie

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    I would be looking at the MSA regs aka the 'blue book'
    Jon
     
  3. 10mm socket Paid Member Paid Member

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    Thanks Jon, I have. That's where the reference has come from
     
  4. Nige

    Nige Paid Member Paid Member

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    The dimensions are also critical, it`s not just the strength. The Blue Book specifies tube OD and thicknesses, if you go away from that you aren`t complying. If you aren`t competing the question is, does it really matter ?

    But for the minimal price difference I always buy the CDS tube in the dimensions specified by the MSA
     
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  5. Sirguydo

    Sirguydo Fastest milkman in the West Paid Member

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    Nige do you have a spare 1200mm piece knocking about as I'd like to weld a harness bar in mine ?
     
  6. 10mm socket Paid Member Paid Member

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    What an odd question or statement.....however you meant. If I'm interested in building a complying roll cage, it's probably because I'm interested in competing in a msa/ fia ruled sport.
     
  7. Nige

    Nige Paid Member Paid Member

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    I was meaning that if the tube is strong enough and above the specs, the o/d and i/d isn`t an issue if it`s oversized.

    eg, if the tube should be 44.45mm x 2.64mm but your supplier has 45mm x 2.75mm then that would be suitable but not listed in the Blue Book. Make sense ?
     
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  8. 10mm socket Paid Member Paid Member

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    Perfectly clear.... thanks.
     
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  9. 10mm socket Paid Member Paid Member

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    Do all cage pieces have to made of 45mm or is it just the main cube sides, then braces be 38mm
     
  10. Nige

    Nige Paid Member Paid Member

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    The Mandatory pieces can be 45mm x 2.5mm or 50mm x2 mm

    Optional can be 38mm x 2.5mm or 40mm x 2mm

    More details and diagrams in the Blue Book Section K
     
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  11. 10mm socket Paid Member Paid Member

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    Thanks nige, what are the mandatory items..I can't then listed.
    Oh, I've just found a stockist of reasonably priced cds tube, but they're out of stock for another 4 weeks
     
  12. notenoughtime

    notenoughtime Moderator Moderator

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    You need 1200mm? 45mm or 38mm

    45mm x 2.75mm main hoops and 38mm x 2.5mm

    I can order it 4-5 days
     

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