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Thread: Ivoprop ifa bolts

  1. #1
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    Default Ivoprop ifa bolts

    Hi Kitfox gang...im looking for bolts and nut for my ivoprop IFA
    I Check with ivo compagnie...they send me that
    Dear JF,
    Ultralight model Electric adjust uses
    8 mm bolt that is 80 mm under the head, 1.25 metric pitch,
    8.8 metric hardness. It will say 8.8 on the head.
    Regards, Roni

    So i dont know nothing about bolts size..how lenght are the thread?
    Can have it in AN bolts at spruce???

    Thank's
    JF

  2. #2
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    Default Re: Ivoprop ifa bolts


  3. #3
    Senior Member Dave S's Avatar
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    Default Re: Ivoprop ifa bolts

    Roni,

    There may be more than one supplier out there for metric bolts which could be used for the prop. I had to sort through this also when I got to looking for prop bolts.

    For the metric bolt sizes. The Length (80mm) is the total lenght of the bolt shank including the threaded and non threaded part. The lenght of the threaded portion is standardized so if you get an 80 MM bolt, the threaded portion is not mentioned, but is assumed to be the same number of threads as other 80 mm bolts.

    The pitch is determined by Rotax as that is what the prop flange is threaded for.

    The hardness for metric bolts will be 8.8, 10.9 or 12.9. The hardness is critical as bolts which are too hard carry some risk of cracking in certain applications. 8.8 is medium carbon steel, quenched and tempered. The harder bolts have a slightly higher yield strength and tensile strength, but they are also more brittle.

    The other thing a person can run into with metric bolts is stainless steel.....not to be used for this but easily identified as the heads have an "A" embossed on the top

    I ended up getting bolts from Fastenall - don't know if they distribute in Canada or not but I bet there is someone who does.

    One thing to always check for, due to washers, and other items affecting thickness of the prop hub stack, is to assure that the bolts do not bottom out on the unthreaded shank of the bolt against the engine prop flange.

    The other thing I found out is it is hard to find any metric bolts with drilled heads for safety wire, consequently, I believe most folks use jam nuts on the back of the prop hub for securement.

    Fly well,

    DS
    Dave S
    Kitfox 7 Trigear (Flying since 2009)
    912ULS Warp Drive

    St Paul, MN

  4. #4
    Senior Member Dave S's Avatar
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    Default Re: Ivoprop ifa bolts

    OK,

    I am busted - I see the reference Jim showed has drilled 80 mm

    Dave S
    Kitfox 7 Trigear (Flying since 2009)
    912ULS Warp Drive

    St Paul, MN

  5. #5
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    Default Re: Ivoprop ifa bolts

    Thank's again...That is what i need..but for 912 ul,i need nut on the other side of the flange..maybe im to stupid 😜.. but i cant find $&@" nut for That bolts.. i write...m8x1.25.. m8 ....1.25 ??? Nothing


    What is a right way to find a nut?

    Many thank's
    JF

  6. #6
    Senior Member Dave S's Avatar
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    Default Re: Ivoprop ifa bolts

    JF - Got mine ordered from a local Fastenall store - they might also have an on-line source and likely other companies do also - I ordered a bag of 50 or so of the m8x1.25 nylock nuts figuring I would not reuse them more than once.
    Dave S
    Kitfox 7 Trigear (Flying since 2009)
    912ULS Warp Drive

    St Paul, MN

  7. #7
    Senior Member jrevens's Avatar
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    Default Re: Ivoprop ifa bolts

    Hi JF...

    Google search with "M8 x 1.25 nut" and you will get a lot of results.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  8. #8
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    Default Re: Ivoprop ifa bolts

    Roger!!!

    Thank's
    That is really help

    Jf

  9. #9
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    Default Re: Ivoprop ifa bolts

    yes......it is hard to find that nut..i oder 50x from ebay ,but they are black plated..

    thank's guy's

  10. #10
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    Default Re: Ivoprop ifa bolts

    I bought a half dozen from the local Lowes Building Center, found them in the metric section. My prop flange had threads in it, so these (Chinese?) bolts were probably plenty good enough. Actually, when you think about it, a lock nut on a hiem joint is just a regular nut..... I would rather have a locking type nut on the prop though. JImChuk

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