MS20074-05-24 bolts

Well, I use 4 of these bolts in the "Jesus" bolt position whose job is to
keep my my entire rotor blade system from departing like a kids toy. Yes, I
want to be 500' in the air not even wondering if I got the bolts that I
thought I did.

Stu
"Maxwell" wrote in message
...

"cavelamb himself" wrote in message
...
wrote:
On Jan 3, 2:45 pm, "Stuart & Kathryn Fields" wrote:

Recent quote for 16 of these bolts was about $20.00 each!! Anyone out
there
with a less expensive source?


Since I presume you're dealing with an experimental aircraft, and a
MS20074 bolt is a coarse thread (the only coarse thread aircraft
structural bolt I know of), 125 ksi, drilled head hex bolt, why not
just use a grade 5 or grade 8 auto bolt? They are quite good quality
if you buy from the right source. Try some of the race car suppliers
maybe.

Regards,
Bud


It might be quite good quality - or it might be junk.

How are you going to know???

If you go with a quailty manufacturer that will certify the grade, specify
rolled threads, and have them individually magnafluxed, you should be good
to go.

In that case I doubt I'd bitch about the $80 cost for 4 bolts.


Stuart & Kathryn Fields wrote:
Well, I use 4 of these bolts in the "Jesus" bolt position whose job is to
keep my my entire rotor blade system from departing like a kids toy. Yes, I
want to be 500' in the air not even wondering if I got the bolts that I
thought I did.

Stu
"Maxwell" wrote in message
...
"cavelamb himself" wrote in message
...
wrote:
On Jan 3, 2:45 pm, "Stuart & Kathryn Fields" wrote:

Recent quote for 16 of these bolts was about $20.00 each!! Anyone out
there
with a less expensive source?

Since I presume you're dealing with an experimental aircraft, and a
MS20074 bolt is a coarse thread (the only coarse thread aircraft
structural bolt I know of), 125 ksi, drilled head hex bolt, why not
just use a grade 5 or grade 8 auto bolt? They are quite good quality
if you buy from the right source. Try some of the race car suppliers
maybe.

Regards,
Bud

It might be quite good quality - or it might be junk.

How are you going to know???
If you go with a quailty manufacturer that will certify the grade, specify
rolled threads, and have them individually magnafluxed, you should be good
to go.

Well there is a little more to it. I'm assisting other builders and the
bolt count goes up @ 4/ ship and it adds up quickly. I'm sure that there is
a source somewhere at more like $10/bolt I bought "Supertanium" bolts for
less than $20 each and these are a high strength Titatanium alloy in the
200ksi region.
The MS are of the grade 5 variety, coarse thread and the only thing special
is the drilled head. $20 each is excessive.
Stu
"Gig601XLBuilder" wrote in message
...
In that case I doubt I'd bitch about the $80 cost for 4 bolts.


Stuart & Kathryn Fields wrote:
Well, I use 4 of these bolts in the "Jesus" bolt position whose job is
to keep my my entire rotor blade system from departing like a kids toy.
Yes, I want to be 500' in the air not even wondering if I got the bolts
that I thought I did.

Stu
"Maxwell" wrote in message
...
"cavelamb himself" wrote in message
...
wrote:
On Jan 3, 2:45 pm, "Stuart & Kathryn Fields" wrote:

Recent quote for 16 of these bolts was about $20.00 each!! Anyone
out there
with a less expensive source?

Since I presume you're dealing with an experimental aircraft, and a
MS20074 bolt is a coarse thread (the only coarse thread aircraft
structural bolt I know of), 125 ksi, drilled head hex bolt, why not
just use a grade 5 or grade 8 auto bolt? They are quite good quality
if you buy from the right source. Try some of the race car suppliers
maybe.

Regards,
Bud

It might be quite good quality - or it might be junk.

How are you going to know???
If you go with a quailty manufacturer that will certify the grade,
specify rolled threads, and have them individually magnafluxed, you
should be good to go.

On Jan 4, 10:05*am, "Stuart & Kathryn Fields" wrote:
The MS are of the grade 5 variety, coarse thread and the only thing special
is the drilled head. *$20 each is excessive.

How about you buy a full box of Grade 8 bolts, test half or quarter of
them to destruction in shear and tension, and then reject the box if
any fail below expected values. If they pass, test the rest to the
implementation design limits and then drill the heads on your drill
press using a carbide bit. That might work.

Bob K.

"Bob Kuykendall" wrote in message
...

How about you buy a full box of Grade 8 bolts, test half or quarter of
them to destruction in shear and tension, and then reject the box if
any fail below expected values. If they pass, test the rest to the
implementation design limits and then drill the heads on your drill
press using a carbide bit. That might work.

+++++++++++++++++++++++++++++++++++

I did that with my prop bolts. Better buy twice as many plus a dozen extra
carbide bits. Anybody wanna buy about six grade 8 prop bolts with busted
carbide bits imbedded in the hex heads?

Rich S.

Rich S. wrote:
"Bob Kuykendall" wrote in message
...

How about you buy a full box of Grade 8 bolts, test half or quarter of
them to destruction in shear and tension, and then reject the box if
any fail below expected values. If they pass, test the rest to the
implementation design limits and then drill the heads on your drill
press using a carbide bit. That might work.

+++++++++++++++++++++++++++++++++++

I did that with my prop bolts. Better buy twice as many plus a dozen extra
carbide bits. Anybody wanna buy about six grade 8 prop bolts with busted
carbide bits imbedded in the hex heads?

Rich S.



I have to report the same levels of sucess!

Those tiny little bits break when they start to come out the bottom side.

BTW, Why Grade 8?
Seems like those might be a but - brittle?


Richard

cavelamb himself wrote:


I have to report the same levels of sucess!

Those tiny little bits break when they start to come out the bottom side.

BTW, Why Grade 8?
Seems like those might be a but - brittle?


Richard

Because a grade 8 bolt on a bad day still beats a grade 5 for strength
on its best day. Someone showed the numbers on that issue either here or
one of the list-servers I subscribe to.

Dave

"Stuart & Kathryn Fields" wrote in message
...
Well, I use 4 of these bolts in the "Jesus" bolt position whose job is to
keep my my entire rotor blade system from departing like a kids toy. Yes,
I want to be 500' in the air not even wondering if I got the bolts that I
thought I did.

Stu
"Maxwell" wrote in message
...

"cavelamb himself" wrote in message
...
wrote:
On Jan 3, 2:45 pm, "Stuart & Kathryn Fields" wrote:

Recent quote for 16 of these bolts was about $20.00 each!! Anyone out
there
with a less expensive source?


Since I presume you're dealing with an experimental aircraft, and a
MS20074 bolt is a coarse thread (the only coarse thread aircraft
structural bolt I know of), 125 ksi, drilled head hex bolt, why not
just use a grade 5 or grade 8 auto bolt? They are quite good quality
if you buy from the right source. Try some of the race car suppliers
maybe.

Regards,
Bud


It might be quite good quality - or it might be junk.

How are you going to know???

If you go with a quailty manufacturer that will certify the grade,
specify rolled threads, and have them individually magnafluxed, you
should be good to go.



Well in that case I think I would consider having them independently
inspected even if I purchased AN certified hardware. I don't think it is
horribly expensive.

On Jan 4, 10:12*am, "Stuart & Kathryn Fields" wrote:
Well, *I use 4 of these bolts in the "Jesus" bolt position whose job is to
keep my my entire rotor blade system from departing like a kids toy. *Yes, I
want *to be 500' in the air not even wondering if I got the bolts that I
thought I did.

Stu"Maxwell" wrote in message

...





"cavelamb himself" wrote in message
...
wrote:
On Jan 3, 2:45 pm, "Stuart & Kathryn Fields" wrote:

Recent quote for 16 of these bolts was about $20.00 each!! *Anyone out
there
with a less expensive source?

Since I presume you're dealing with an experimental aircraft, and a
MS20074 bolt is a coarse thread (the only coarse thread aircraft
structural bolt I know of), 125 ksi, drilled head hex bolt, why not
just use a grade 5 or grade 8 auto bolt? They are quite good quality
if you buy from the right source. Try some of the race car suppliers
maybe.

Regards,
Bud

It might be quite good quality - or it might be junk.

How are you going to know???

If you go with a quailty manufacturer that will certify the grade, specify
rolled threads, and have them individually magnafluxed, you should be good
to go.- Hide quoted text -

- Show quoted text -

I agree that I would want top quality for the "Jesus" nut as we used
to call them. I also agree with the others that I wouldn't complain
about $80 for them. Not the place to try and save money in my opinion.
As for not knowing what you have, ARP makes bolts for racing cars that
are made to the same AMS (aerospace metallurgical standard) specs as
aircraft. I doubt that they will be any cheaper however. They make big
end rod bolts to 300 ksi using Aermet 100, the strongest structural
metal available. They probably cost as much or more as any MS bolt. As
I said, MS20074 bolts are only 125,000 psi strength bolts, and since
they are coarse thread, are not as strong as an AN bolt in tension.

http://www.arp-bolts.com/

Regards,
Bud