Woodhouse 468x60 Banner
SAE Grade 5 vs Metric 8.8
Last Post 20 Mar 2001 08:42 PM by Lemke. 2 Replies.
Printer Friendly
  •  
  •  
  •  
  •  
  •  
Sort:
PrevPrev NextNext
You are not authorized to post a reply.
Author Messages
ScottNutterUser is Offline
New Member
New Member
Posts:6


--
20 Mar 2001 11:47 AM
    I am prepping an 83 RX7 for ITA and of course some of the bolts along with the roll cage bolts will end up being new. I would like to use metric bolts because in some instances it's the right thing to do and in others for convienience of knowing that I only need my metric tools at the track. The GCR states sizes and grades in english/SAE standards, dimensions are easy but is the metric specification of 8.8 the equivilant to grade 5 or do I need to get 10.9 bolts?

    Thanks
    DavardUser is Offline
    Veteran Member
    Veteran Member
    Posts:1249


    --
    20 Mar 2001 07:32 PM
    Since M10.9 is roughly equivalent to grade 8, I believe that 8.8 is similar to grade 5.

    Tensile strength of a grade 5 is 120,000psi, where grade 8 is 150,000psi at an elevated temp, although I don't remember what that temp is. Grade 8 bolts are more brittle than grade 5.

    Maybe you can find some specs for metric fasteners that would compare to this data.

    ------------------
    David Avard
    '90 Mazda Protege LX
    LemkeUser is Offline
    New Member
    New Member
    Posts:


    --
    20 Mar 2001 08:42 PM
    FYI...

    8.8 = approx. 116,000 psi (800N/mm2)
    9.8 = approx. 130,000 psi (9000N/mm2)
    10.9 = approx. 145,000 psi (1000N/mm2)
    12.9 = approx. 174,000 psi (1200N/mm2)



    ------------------
    Lemke Design+Fabrication
    You are not authorized to post a reply.


    Sunoco 88x31 Button Rugged Radio 88
    saferacer
    Woodhouse Motorsports SPS 88x31 Button
    Race-Technology CarboTech 88x31 Button
    HoosierTire88x31 Vorshlag 88x31 Button
    UltraRev 88x31 Traqmate 88x31 Button
    Apex Detail Button Hyperfuels 88x31 Button

    Advertise on SCCAForums.com and reach thousands of visitors per day!

    SafeRacer FREE SHIPPING over $99

    Shop for Pirelli tires at Tire Rack. blank




    Sunoco Bottom 468x60 Banner