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 The friggen upper arm bolt again
#790857
02/19/07 08:39 PM
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Joined: Sep 2002
Posts: 3,634
OP
Roll Me Over
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Ok. So I'm finally making some legs on this... I cannot find ANYWHERE a 12x1.5 pitch that is grade 10.9 <img src="/forums/images/graemlins/angry.gif" alt="" /> So - Do you think there is any harm done with going with 1.75 pitch? For those out the loop on my saga - this is for a longer bolt (70mm instead of stock 55mm) to accomodate more shims to fix my wheel camber.
concreteprinter.com
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Re: The friggen upper arm bolt again
[Re: bretwalda]
#790858
02/19/07 08:53 PM
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Joined: Jan 2001
Posts: 3,876
Roll Me Over
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Ah? Why would the pitch make any difference if you change the nut to match as well? Or is the nut welded in place on a genII
89 2dr 3.0 AT, manual hubs. 33x12.5 MT gen 2 coils,Cranked front tbars Dons rocker protection, Front/Rear Bumpers. ARB rear locker, 2" BL, Beefed up skid plates/trailing arms. Gen II uca, 2 Bouncy seats www.youtube.com/TagGeorge
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Re: The friggen upper arm bolt again
[Re: Tag]
#790859
02/19/07 08:57 PM
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Joined: Sep 2002
Posts: 3,634
OP
Roll Me Over
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cuz the pitch determines its holding power (pull-out strength? not sure of the correct terminology) I would imagine this is an area that undergoes alot of brute force <img src="/forums/images/graemlins/confused.gif" alt="" />
concreteprinter.com
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Re: The friggen upper arm bolt again
[Re: bretwalda]
#790860
02/19/07 09:10 PM
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Joined: Dec 2004
Posts: 5,231
Trail Leader
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cuz the pitch determines its holding power (pull-out strength? not sure of the correct terminology) I would imagine this is an area that undergoes alot of brute force <img src="/forums/images/graemlins/confused.gif" alt="" /> Ditto...lot of stresses and vibration going on there and tighter pitch on the threads means more ability to hold (given that all else is equal, of course). Tag, I'll be doing the UCA mod next week. I considered using the bolts you suggested from Fastenal, until I saw the difference in pitch than the stock bolts. The stock bolts have a much greater holding strength than the bolts you went with, so I decided to order UCA bolts/nuts for a Gen II. Will let you know how it goes.
?_________ |_|_|\____\___ l-----[O]≡≡≡≡[O] ()_)()_)-----)_) Stay the Trail! 
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Re: The friggen upper arm bolt again
[Re: CapnCrunch]
#790861
02/19/07 09:15 PM
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Joined: Jan 2001
Posts: 3,876
Roll Me Over
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Oh well isnt that just great news for me! I just went by how strong the bolt was. Oh well I was considering trying to find some longer ones any way. The current bolt I have do not leave much bolt sticking through.
89 2dr 3.0 AT, manual hubs. 33x12.5 MT gen 2 coils,Cranked front tbars Dons rocker protection, Front/Rear Bumpers. ARB rear locker, 2" BL, Beefed up skid plates/trailing arms. Gen II uca, 2 Bouncy seats www.youtube.com/TagGeorge
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Re: The friggen upper arm bolt again
[Re: bretwalda]
#790863
02/20/07 06:04 AM
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Joined: Jan 2007
Posts: 26
Getting the Wheeling Fever
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Ok. So I'm finally making some legs on this... I cannot find ANYWHERE a 12x1.5 pitch that is grade 10.9 <img src="/forums/images/graemlins/angry.gif" alt="" /> They should have it...and they're local to me so if they want to charge you an arm and a leg for shipping send me a PM and I'll pick it up and mail it to you. Chris
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Re: The friggen upper arm bolt again
[Re: Chris009]
#790864
02/20/07 11:49 AM
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Joined: Dec 2006
Posts: 109
Wheeler
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Ok. So I'm finally making some legs on this... I cannot find ANYWHERE a 12x1.5 pitch that is grade 10.9 <img src="/forums/images/graemlins/angry.gif" alt="" /> They should have it...and they're local to me so if they want to charge you an arm and a leg for shipping send me a PM and I'll pick it up and mail it to you. Chris I use this place when I cant get it local. They have it all. http://www.boltdepot.com/product.aspx?cc=25&cs=81&cm=19&cd=1318
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Re: The friggen upper arm bolt again
[Re: guzzilapd]
#790865
02/21/07 06:48 AM
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Joined: Sep 2002
Posts: 3,634
OP
Roll Me Over
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Nope and nope on the last 2 - thanks for diggin tho guys. I'm gonna inquire on yours Ray but I'm doubtful - everywhere its the same - you can either get 12x1.75 grade 10.9 or 12x1.5 grade 8.8 and that leaves me hanging.
So...any opinions? KevinC? Frank? FastEddy? NathanC? all others? 1.75 pitch a risky go or no??
concreteprinter.com
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Re: The friggen upper arm bolt again
[Re: bretwalda]
#790866
02/21/07 02:17 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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I wouldn't want to make the call for you, but there is some reading material available to help you decide. There are probably better sources available than the ones I've listed, but the general suggestion is that there used to be many different thread types (for various reasons) and now most manufacturers are on the ISO engineering standards. As an example, fine pitches were/are used where thread height is too great to use - as with thin-walled pipe. Metric screws
The diameter of a ISO preferred series screw is specified in millimetres (mm) prefixed by the capital letter M, as in "M6" for a 6 mm diameter screw.
The pitch of metric threads varies according to the diameter, but not absolutely regularly. Some examples: a M3 thread has a 0.5 mm pitch, M4: 0.7 mm, M6: 1 mm, M10-12: 1.5 mm, M14-16: 2 mm, M18-22: 2.5 mm.
The diameter of a metric screw is the outer diameter of the thread. The tapped hole (or nut) into which the screw fits, has an internal diameter which is the size of the screw minus the pitch of the thread. Thus, an M6 screw, which has a pitch of 1 mm, is made by threading a 6 mm shaft, and the nut or threaded hole is made by tapping threads in a 5 mm hole.
Metric screw threads are also available in "fine pitch" versions, sometimes several pitches for one diameter (example: M18/fine in 1, 1.5 and 2 mm pitches). The fine thread series is deprecated and not recommended for use in new designs. The fine metric threads were once found in equipment made in the Far East , but that has changed with the standardisation of the ISO preferred thread series.
Note that M12 x 1.75 is the ISO default: web page 2 web page 3If you poke around, you should be able to find an engineering table that would compare the holding strength of various thread sizes. Here's a list of ISO standards - if you can identify the correct one, you'll find your answer, but you'll probably have to pay for a copy: web page 4 If I had to choose between bolt strength and thread pitch, I'd choose bolt strength. I'd also use lockwashers AND nylock nuts (I have them on my A-arm bolts). Frank
Last edited by FrankR; 02/21/07 03:05 PM.
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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