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phactor9
Joined: 16 Jun 2011
Posts: 78
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 Posted: Fri Jul 27, 2012 12:15 pm Post subject: AN5H-31A prop bolts |
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I need six AN5H-31A prop bolts where the threads length is at least 7/8" and 20 threads-per-inch. I cannot find them after days of searching. Any ideas?
Phil H. [quote][b]
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dpeters160(at)gmail.com
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| Posted: Fri Jul 27, 2012 12:22 pm Post subject: AN5H-31A prop bolts |
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Dillsburg
On Friday, July 27, 2012, Phil <phactor9(at)yahoo.com (phactor9(at)yahoo.com)> wrote:
| Quote: | I need six AN5H-31A prop bolts where the threads length is at least 7/8" and 20 threads-per-inch. I cannot find them after days of searching. Any ideas?
>
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| Quote: | Phil H.
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byoungplumbing(at)gmail.c
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| Posted: Fri Jul 27, 2012 12:58 pm Post subject: AN5H-31A prop bolts |
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call aircraft spruce... the last time i needed prop bolts, i could not find them in their catalog.. but called them and they were on my door step in a week. i don't know if they had them in stock and not in the catalog,,, or they outsourced them. guess it don't matter, i had the bolts i needed.
boyd young
I need six AN5H-31A prop bolts where the threads length is at least 7/8" and 20 threads-per-inch. I cannot find them after days of searching. Any ideas?
Phil H.
[quote][b]
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smlplanet(at)msn.com
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| Posted: Fri Jul 27, 2012 7:11 pm Post subject: AN5H-31A prop bolts |
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Be careful when buying your bolts. There was an article on one of the other flying site some time back about the ones made over seas, they did not meet the standards stamped on the bolts and was not holding up and breaking. Aircraft Spruce, Lockwood or Leaf would be your best bet as you never know what your getting at local suppliers.
Date: Fri, 27 Jul 2012 13:14:32 -0700
From: phactor9(at)yahoo.com
Subject: AN5H-31A prop bolts
To: kolb-list(at)matronics.com
I need six AN5H-31A prop bolts where the threads length is at least 7/8" and 20 threads-per-inch. I cannot find them after days of searching. Any ideas?
Phil H.[quote]
arget=_blank>http://www.matronics.com/Navigator?Kolb-List
ttp://forums.matronics.com
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[b]
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racerjerry
Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY
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| Posted: Sat Jul 28, 2012 4:02 am Post subject: Re: AN5H-31A prop bolts |
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What engine / gearbox are these bolts this for?
AN5H denotes a 5/16 diameter bolt having 24 threads per inch – NOT 20.
5/16 x 20 is not a standard American thread, but this size could easily be confused with a metric 8 x 1.25 mm bolt – at least until you try to thread a standard nut onto it. The metric 1.25 pitch is equivalent to 20.32 threads per inch and in 8 mm diameter is VERY close in both diameter and pitch to your mystical “5/16 x 20” bolt.
Another completely different thought:
AN4H-31A, which is a 1/4 x 28 drilled head prop bolt, is a relatively common prop bolt for ultralight engines (at least it was listed in my old CPS catalog).
Common American Bolt sizes (diameter & threads per inch)
1/4 -20 (NC)
1/4 - 28 (NF) < AN4
5/16 -18 (NC)
5/16 -24 (NF) < AN5
3/8 -16 (NC)
3/8 -24 (NF) < AN6
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phactor9
Joined: 16 Jun 2011
Posts: 78
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| Posted: Sat Jul 28, 2012 4:27 am Post subject: AN5H-31A prop bolts |
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Hi Jerry:
You have "hit the bolt on the head", so to speak.
You are correct - I have determined I need the 8 x 1.25 x 80mm 10.9 grade bolt. They are very close indeed. Thank you for confirming what I just discovered in the last 24 hours. This is for the CRE mz201 with 1.77:1 belt reduc.
Phil H.
--- On Sat, 7/28/12, racerjerry <gki(at)suffolk.lib.ny.us> wrote:
[quote]
From: racerjerry <gki(at)suffolk.lib.ny.us>
Subject: Re: AN5H-31A prop bolts
To: kolb-list(at)matronics.com
Date: Saturday, July 28, 2012, 8:02 AM
--> Kolb-List message posted by: "racerjerry" <[url=/mc/compose?to=gki(at)suffolk.lib.ny.us]gki(at)suffolk.lib.ny.us[/url]>
What engine / gearbox are these bolts this for?
AN5H denotes a 5/16 diameter bolt having 24 threads per inch – NOT 20.
5/16 x 20 is not a standard American thread, but this size could easily be confused with a metric 8 x 1.25 mm bolt – at least until you try to thread a standard nut onto it. The metric 1.25 pitch is equivalent to 20.32 threads per inch and in 8 mm diameter is VERY close in both diameter and pitch to your mystical “5/16 x 20” bolt.
Another completely different thought:
AN4H-31A, which is a 1/4 x 28 drilled head prop bolt, is a relatively common prop bolt for ultralight engines (at least it was listed in my old CPS catalog).
Common American Bolt sizes (diameter & threads per inch)
1/4 -20 (NC)
1/4 - 28 (NF) < AN4
5/16 -18 (NC)
5/16 -24 (NF) < AN5
3/8 -16 (NC)
3/8 -24 (NF) < AN6
--------
Jerry King
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379399#379399
http======================== [quote][b]
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sat Jul 28, 2012 11:22 am Post subject: AN5H-31A prop bolts |
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Phil, Is it your prop maker's recommendation to use 10.9 spec bolts? Warp Drive, whose high inertia stresses prop bolts more than most, specs 8.8. Power Fin uses softer bolts yet with their props, spec'ing stainless steel bolts. Just wondering.
Rick Girard
Do not archive
On Sat, Jul 28, 2012 at 7:24 AM, Phil <phactor9(at)yahoo.com (phactor9(at)yahoo.com)> wrote:
| Quote: | Hi Jerry:
You have "hit the bolt on the head", so to speak.
You are correct - I have determined I need the 8 x 1.25 x 80mm 10.9 grade bolt. They are very close indeed. Thank you for confirming what I just discovered in the last 24 hours. This is for the CRE mz201 with 1.77:1 belt reduc.
Phil H.
--- On Sat, 7/28/12, racerjerry <gki(at)suffolk.lib.ny.us (gki(at)suffolk.lib.ny.us)> wrote:
| Quote: |
From: racerjerry <gki(at)suffolk.lib.ny.us (gki(at)suffolk.lib.ny.us)>
Subject: Re: AN5H-31A prop bolts
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Date: Saturday, July 28, 2012, 8:02 AM
--> Kolb-List message posted by: "racerjerry" <gki(at)suffolk.lib.ny.us>
What engine / gearbox are these bolts this for?
AN5H denotes a 5/16 diameter bolt having 24 threads per inch – NOT 20.
5/16 x 20 is not a standard American thread, but this size could easily be confused with a metric 8 x 1.25 mm bolt – at least until you try to thread a standard nut onto it. The metric 1.25 pitch is equivalent to 20.32 threads per inch and in 8 mm diameter is VERY close in both diameter and pitch to your mystical “5/16 x 20” bolt.
Another completely different thought:
AN4H-31A, which is a 1/4 x 28 drilled head prop bolt, is a relatively common prop bolt for ultralight engines (at least it was listed in my old CPS catalog).
Common American Bolt sizes (diameter & threads per inch)
1/4 -20 (NC)
1/4 - 28 (NF) < AN4
5/16 -18 (NC)
5/16 -24 (NF) < AN5
3/8 -16 (NC)
3/8 -24 (NF) < AN6
--------
Jerry King
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379399#379399
http========================
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tp://forums.matronics.com
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Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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phactor9
Joined: 16 Jun 2011
Posts: 78
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| Posted: Sat Jul 28, 2012 11:50 am Post subject: AN5H-31A prop bolts |
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Essentially, if I can only find 10.9 (metric) and not 8.8 (metric), I'll gladly take it. This leads me to ask (rhetorically) if 8.8 is preferred over 10.9 as a prop bolt. My other prop's bolts (thinner hub) are 10.9.
So, I finally got around to Googling "is 10.9 the same as grade 8"... (comparing metric classes to SAE grades).
Apparently, metric "Class 10.9" is almost the equivalent to SAE "Grade 8" - I'm just learning all this, too, but I'm sure I need M8 x 1.25 x 80mm head-drilled, so thanks to everyone that replied!
Read this...
"No they are not the same but very simular. Grade 8 is what the SAE came out with and grade 10.9 is the metric version. Grade 8 min tensile strenght is 150K PSI and 10.9 is 142.2K. Also the torque capacity of the grade 8 is higher then its metric conterpart."
...at this link:
http://hondaswap.com/general-tech-maintenance/grade-8-vs-class-10-9-bolts-54419/
Here's a chart (not clear)
http://www.boltdepot.com/fastener-information/Materials-and-Grades/Bolt-Grade-Chart.aspx
This chart is clearer:
http://www.k-tbolt.com/bolt_chart.html
Again, read this...
"we grade our bolts (hardness) gr 2, gr 5, gr 8. Metric bolts come in 8.8, 9.8, 10.9 and 12.9. Seeing one of those numbers on the head tells you right away that what youre looking at is a metric bolt. 8.8 is the equivalant of grade 5, and 10.9 is pretty much the same as our grade 8. Its not at all uncommon to see metric on american cars, but most american cars have both U.S. and metric bolts on them.
...at this link:
http://www.ffcars.com/forums/44-2004-roadster-archives-read-only/113163-bolts-grade-5-grade-8-grade-10-9-a.html
More info than you need, but it's free 
Phil H.
--- On Sat, 7/28/12, Richard Girard <aslsa.rng(at)gmail.com> wrote:
| Quote: |
From: Richard Girard <aslsa.rng(at)gmail.com>
Subject: Re: Re: AN5H-31A prop bolts
To: kolb-list(at)matronics.com
Date: Saturday, July 28, 2012, 3:21 PM
Phil, Is it your prop maker's recommendation to use 10.9 spec bolts? Warp Drive, whose high inertia stresses prop bolts more than most, specs 8.8. Power Fin uses softer bolts yet with their props, spec'ing stainless steel bolts. Just wondering.
Rick Girard
Do not archive
On Sat, Jul 28, 2012 at 7:24 AM, Phil <phactor9(at)yahoo.com (phactor9(at)yahoo.com)> wrote:
| Quote: | Hi Jerry:
You have "hit the bolt on the head", so to speak.
You are correct - I have determined I need the 8 x 1.25 x 80mm 10.9 grade bolt. They are very close indeed. Thank you for confirming what I just discovered in the last 24 hours. This is for the CRE mz201 with 1.77:1 belt reduc.
Phil H.
--- On Sat, 7/28/12, racerjerry <gki(at)suffolk.lib.ny.us (gki(at)suffolk.lib.ny.us)> wrote:
| Quote: |
From: racerjerry <gki(at)suffolk.lib.ny.us (gki(at)suffolk.lib.ny.us)>
Subject: Re: AN5H-31A prop bolts
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Date: Saturday, July 28, 2012, 8:02 AM
--> Kolb-List message posted by: "racerjerry" <gki(at)suffolk.lib.ny.us>
What engine / gearbox are these bolts this for?
AN5H denotes a 5/16 diameter bolt having 24 threads per inch – NOT 20.
5/16 x 20 is not a standard American thread, but this size could easily be confused with a metric 8 x 1.25 mm bolt – at least until you try to thread a standard nut onto it. The metric 1.25 pitch is equivalent to 20.32 threads per inch and in 8 mm diameter is VERY close in both diameter and pitch to your mystical “5/16 x 20” bolt.
Another completely different thought:
AN4H-31A, which is a 1/4 x 28 drilled head prop bolt, is a relatively common prop bolt for ultralight engines (at least it was listed in my old CPS catalog).
Common American Bolt sizes (diameter & threads per inch)
1/4 -20 (NC)
1/4 - 28 (NF) < AN4
5/16 -18 (NC)
5/16 -24 (NF) < AN5
3/8 -16 (NC)
3/8 -24 (NF) < AN6
--------
Jerry King
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379399#379399
http========================
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| Quote: |
get="_blank">http://www.matronics.com/Navigator?Kolb-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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[quote][b]
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Sat Jul 28, 2012 1:33 pm Post subject: AN5H-31A prop bolts |
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| Quote: | | ...8.8 is the equivalant of grade 5, and 10.9 is pretty much the same as our grade 8... |
Correct. FWIW, AN bolts are roughly equivalent to grade 5 or metric 8.8, but with more stringent quality control. Using bolts that are too strong can be almost as bad as too weak in some applications, as the stronger bolts can be more brittle than the softer ones.
The fine thread of AN bolts can be unsuitable for redrives where the bolts thread into holes tapped into an aluminum prop hub as the fine threads can easily strip out of the aluminum. With nuts, they're fine. I've drilled out the tapped M6 holes in a PPG redrive to a clearance hole for 1/4" AN4 bolts with locknuts when the metric bolts (which were not drilled for safety wire) kept loosening, and you could do the same with M8 to 5/16 AN5.
-Dana
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Many people are alive only because it’s illegal to shoot them.
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