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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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 Posted: Tue May 29, 2007 6:29 pm Post subject: bolts for props |
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Ok, I need a bit of help regarding prop bolts. The ones in my plane are a 8.8 which is metric, right? Somehow I am having trouble believing a generic Metric bolt is the proper bolt for the job. I need to put a spacer between the warp and the drive. The trip to MV really beat up the aileron gap seal, and I could use some noise reduction. Someone please confirm that I can buy the 6 inch 8.8 metric at Nampa without committing suicide.
Larry, Oregon
[quote][b]
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jindoguy(at)gmail.com
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| Posted: Tue May 29, 2007 7:02 pm Post subject: bolts for props |
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Larry, 8.8 metric is the same strength as grade 5 except that 8.8 is an alloy steel fastener like grade 6 (AN bolts). They are very ductile, so as prop bolts they can absorb the stresses placed upon them.
I recently had to call a prop maker to get their recommendation for bolts. Metric 8.8 or stainless steel were the only bolts they would recommend. Since the drive was threaded UNC I couldn't use 8.8, but commercial stainless was available and satisfied the prop maker even though the yield and ultimate strength were 40% less than 8.8 metric (but comparable to the stainless metric hardware).
Rick
On 5/29/07, Larry Cottrell <lcottrell(at)fmtcblue.com (lcottrell(at)fmtcblue.com)> wrote:[quote] Ok, I need a bit of help regarding prop bolts. The ones in my plane are a 8.8 which is metric, right? Somehow I am having trouble believing a generic Metric bolt is the proper bolt for the job. I need to put a spacer between the warp and the drive. The trip to MV really beat up the aileron gap seal, and I could use some noise reduction. Someone please confirm that I can buy the 6 inch 8.8 metric at Nampa without committing suicide.
Larry, Oregon
[quote][b] http://www.matronics.com/Navigator?Kolb-List http://forums.matronics.com
when you live at the airport. [quote][b]
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d-m-hague(at)comcast.net
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| Posted: Tue May 29, 2007 7:44 pm Post subject: bolts for props |
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At 11:01 PM 5/29/2007, Richard Girard wrote:
| Quote: | Larry, 8.8 metric is the same strength as grade 5 except that 8.8 is an
alloy steel fastener like grade 6 (AN bolts). They are very ductile, so as
prop bolts they can absorb the stresses placed upon them...
|
An 8.8 metric bolt also alloy steel, and so is grade 5 and grade 8. AN
bolts aren't grade 6 (there is no such thing, well actually there is but
you'll never see one); they're simply AN bolts. Strengthwise they're
equivalent to grade 5 but the quality control is much better than
commercial grade 5 bolts. Tensile strength of an AN bolt is slightly
better than a coarse thread grade 5 since the thread root diameter is
slightly larger.
I'm not thrilled with the idea of using a generic stainless metric bolt to
hold a prop on, unless I saw the manufacturer's specs (since metric
stainless fasteners aren't graded like the alloy steel ones are.
-Dana
--
--
Okay, who put a "stop payment" on my reality check?
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jindoguy(at)gmail.com
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| Posted: Tue May 29, 2007 8:48 pm Post subject: bolts for props |
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Dana, When I was researching bolt characteristics, the varying grading bodies define both grade 5 and 8 as carbon steels, the 8.8 metric and grade 6 (read the dashes on the head, grade 5 has three, grade 6 has four, grade 8 has six) i.e. AN bolts, are listed as alloy steel. I did not go so far as to get the specific alloy, my memory from a recent class was one of the 4000 series alloys but I haven't confirmed that.
As for the the stainless steel bolts, I used industrial grade bolts which are made to a standard and for which data was available to show that the bolts were equivalent to the metric bolts supplied by the prop maker (and are his standard bolt, by the way).
Rick
On 5/29/07, Dana Hague <d-m-hague(at)comcast.net (d-m-hague(at)comcast.net)> wrote:[quote] --> Kolb-List message posted by: Dana Hague <d-m-hague(at)comcast.net (d-m-hague(at)comcast.net)>
At 11:01 PM 5/29/2007, Richard Girard wrote:
| Quote: | Larry, 8.8 metric is the same strength as grade 5 except that 8.8 is an
alloy steel fastener like grade 6 (AN bolts). They are very ductile, so as
prop bolts they can absorb the stresses placed upon them...
|
An 8.8 metric bolt also alloy steel, and so is grade 5 and grade 8. AN
bolts aren't grade 6 (there is no such thing, well actually there is but
you'll never see one); they're simply AN bolts. Strengthwise they're
equivalent to grade 5 but the quality control is much better than
commercial grade 5 bolts. Tensile strength of an AN bolt is slightly
better than a coarse thread grade 5 since the thread root diameter is
slightly larger.
I'm not thrilled with the idea of using a generic stainless metric bolt to
hold a prop on, unless I saw the manufacturer's specs (since metric
stainless fasteners aren't graded like the alloy steel ones are.
-Dana
--
--
Okay, who put a "stop payment" on my reality check?
when you live at the airport. [quote][b]
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