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  1. #1

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    OS 1/4-28 Prop nut

    I need a few OS 1/4-28 prop nuts. What other things do i need to look for besides the thread size?


    Would a nut with following specifications be alright?


    Description : Property Class : 5, Thread Direction : Right Hand, Rockwell Hardness : C32 max., Meets/Exceeds : ASME/ANSI B18.2.2 1987 (R1999),SAE J995, Grade : 5, Type : Full, Material : Low Carbon Steel, Item : Hex Nut, Finish : Black Oxide, Application : General Purpose


    http://www.zorotools.com/g/Grade-5%2...Nuts/00071179/


  2. #2
    1QwkSport2.5r's Avatar
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    RE: OS 1/4-28 Prop nut


    ORIGINAL: Kiteflyer

    I need a few OS 1/4-28 prop nuts. What other things do i need to look for besides the thread size?


    Would a nut with following specifications be alright?


    Description : Property Class : 5, Thread Direction : Right Hand, Rockwell Hardness : C32 max., Meets/Exceeds : ASME/ANSI B18.2.2 1987 (R1999),SAE J995, Grade : 5, Type : Full, Material : Low Carbon Steel, Item : Hex Nut, Finish : Black Oxide, Application : General Purpose


    http://www.zorotools.com/g/Grade-5%2...Nuts/00071179/

    That would certainly work, but why not just use a spinner nut instead? It doubles as a prop washer and prop nut in one, and looks better too IMO.
    GlowHead Brotherhood #3
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  3. #3

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    RE: OS 1/4-28 Prop nut

    1QwkSport2.5r, you are right, but i am getting them for a few engines with missing nuts that won't be seeing service anytime soon.

  4. #4

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    RE: OS 1/4-28 Prop nut

    That's the same thread as my ASP52.....  I use Spinners too... I can't put my finger on it, but I believe they run just a little smoother with a Aluminium spinner nut. 

    I've heard of nuts coming loose, and nuts breaking in a hard impact, but never on their own... as long as it locks down tight, I'd have thought any nut would do if it fits the thread?

  5. #5
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    RE: OS 1/4-28 Prop nut

    The actual type of nut is not particularly relevant, just make sure it's a good-quality steel nut. The 1/4-28 thread is the thing to be concerned with. It's not the most common thread size, so you most likely won't find it in the bin at your favorite hardware store. You can find 1/4-28 nuts in aircraft supply catalogs.

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  6. #6

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    RE: OS 1/4-28 Prop nut

    I found 1/4 x 28 nuts at the local hardware store. They may be labeled 1/4 fine vs 1/4 x 20 which is 1/4 coarse.

  7. #7
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    RE: OS 1/4-28 Prop nut

    I think the original nuts are grade 8 rather than grade 5 but am not sure.

    A Thunder Tiger nut http://www3.towerhobbies.com/cgi-bin...?&I=LXAPGN&P=0 is $1.79 for one and $1.70 if you order 5. Tower used to sell one brand for less than a dollar each but no more.

    You can find the grade 8 nuts at http://www.mcmaster.com/#hex-nuts but they only sell quantities of 100. Prices are $3.21 to $6.78 plus shipping so they are pretty reasonable for a lifetime supply.
    - Carrell

  8. #8
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    RE: OS 1/4-28 Prop nut

    The ones at the hardware store are a good idea. They are softer than the crank threads so you will wear out the nuts before you wear out the expensive crankshaft. Same thing applies to the drain plug in your passenger car. They are made of a very soft material and get replaced several times before the hardened pan threads give out even if you dont realize it when you pick your car up from the shop( I used to manage a Tire and Lube Express).
    Club Saito # 677-Team Boca Bearings-Star Collectibles Muscatine-Glowhead Brotherhood #19

  9. #9
    downunder's Avatar
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    RE: OS 1/4-28 Prop nut

    I have to agree with jeffie on the hardware store nuts. They may be the softest of all but if you strip the threads on them then you're WAY overtightening them. On occasion I've made T nuts from aluminium bar stock and have never come close to stripping them.


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