driveshaftshop bolts, is it safe? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

puma · 08-25-2014, 03:37 PM

i have installed an aluminum DSS driving shaft but the flange is a lot thicker than the stock one, is it safe to reuse the stock bolts even if there is like half the thread not used on the nut?

King Tut · 08-25-2014, 03:46 PM

That looks like enough thread engagement to me as long as they are not lock nuts and thus not utilizing the locking part at the top of the nut.

Carlitoz3 · 08-25-2014, 04:13 PM

How does that bad boy feel?
Looking into getting the same thing.

IceFyre13th · 08-25-2014, 04:43 PM

How much would it cost to go get new bolts and do it right compared to how much will it cost you when it fails.....?

kmbkk · 08-25-2014, 05:39 PM

Quote:

Originally Posted by Carlitoz3

How does that bad boy feel?
Looking into getting the same thing.

+1 I'm intersted as well!

ZionsWrath · 08-25-2014, 05:48 PM

does it torque to spec?

kodyo · 08-25-2014, 05:53 PM

When we do bolting in industry, we try to have at least 2-3 threads above the end of the nut. What you have would not be considered acceptable.

industrial · 08-25-2014, 06:09 PM

That would not fly on aircraft. 2-3 threads through the nut. I had a similar problem with my driveshaft. I ditched the stock washers and used loctite red, which is a pretty hokey fix, getting the right bolts would be the right thing to do. Holds fine but might be a PITA if you have to rotate your driveshaft.

Akari · 08-25-2014, 06:57 PM

Go spend $4 on bolts, that's not safe at all.

puma · 08-25-2014, 08:13 PM

yeah the thing is to find bolts with a grade high enough for the job. I don't have such a shop around.

I must admit i didn't even think about taking the washer off, that would give me something like 2 threads in addition.

King Tut · 08-25-2014, 08:38 PM

Quote:

Originally Posted by puma

yeah the thing is to find bolts with a grade high enough for the job. I don't have such a shop around.

I must admit i didn't even think about taking the washer off, that would give me something like 2 threads in addition.

You don't have a local hardware store with grade 8 bolts and nuts? I would go with a longer bolt, nut, and a lock washer if you are worried.

kodyo · 08-25-2014, 08:55 PM

They aren't standard bolts. They are partially threaded so shear load isn't taken through the thread. You'd probably be ok to use a little loctite and remove the washer if it gives you enough engagement.

Thorpedo · 08-25-2014, 09:57 PM

1 big vote for NOT acceptable.

White64Goat · 08-25-2014, 10:07 PM

Nope. Replace with correct length. Probably grade 8 if I had to guess.

08-25-2014, 03:37 PM	#1
puma crew chief Join Date: Mar 2014 Drives: Race car FR-S Location: Quebec Posts: 378 Thanks: 6 Thanked 189 Times in 82 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	driveshaftshop bolts, is it safe? i have installed an aluminum DSS driving shaft but the flange is a lot thicker than the stock one, is it safe to reuse the stock bolts even if there is like half the thread not used on the nut?

08-25-2014, 03:46 PM	#2
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	That looks like enough thread engagement to me as long as they are not lock nuts and thus not utilizing the locking part at the top of the nut. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

08-25-2014, 04:43 PM	#4
IceFyre13th Senior Member Join Date: Jun 2013 Drives: Mazdarati Location: Arizona Posts: 1,238 Thanks: 608 Thanked 1,369 Times in 675 Posts Mentioned: 8 Post(s) Tagged: 1 Thread(s)	How much would it cost to go get new bolts and do it right compared to how much will it cost you when it fails.....? __________________ It's only impossible if you stop to think about it.

08-25-2014, 05:48 PM	#6
ZionsWrath Thanks Join Date: Apr 2013 Drives: BRZ Location: NY Posts: 4,163 Thanks: 5,989 Thanked 3,100 Times in 1,498 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	does it torque to spec? __________________

08-25-2014, 09:57 PM	#13
Thorpedo The SquadWhisperer Join Date: Mar 2013 Drives: '13 Ultramarine FR-S (STX) Location: Nova Scotia, Canada Posts: 681 Thanks: 383 Thanked 477 Times in 207 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	1 big vote for NOT acceptable. __________________ 2013+14+15 Atlantic Region Motor Sports Autocross STX Champion 2013+14+15 Atlantic Region Motor Sports Overall Autocross Champion 2017 Bluenose Autosport Club Overall Rallycross Champion Powered by Great North Performance, Jani-King Canada, and OK Tire.

08-25-2014, 04:13 PM	#3
Carlitoz3 Senior Member Join Date: Apr 2013 Drives: 2013 MT Asphalt FRS Location: Baldwin Park, CA Posts: 1,051 Thanks: 237 Thanked 235 Times in 157 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	How does that bad boy feel? Looking into getting the same thing.

08-25-2014, 05:53 PM	#7
kodyo Senior Member Join Date: Jan 2013 Drives: Scion FR-S Location: Los Angeles Posts: 686 Thanks: 597 Thanked 257 Times in 174 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	When we do bolting in industry, we try to have at least 2-3 threads above the end of the nut. What you have would not be considered acceptable.

08-25-2014, 06:09 PM	#8
industrial Add lightness! Join Date: Apr 2012 Drives: 17' WRX Location: Boston Posts: 1,253 Thanks: 380 Thanked 888 Times in 411 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	That would not fly on aircraft. 2-3 threads through the nut. I had a similar problem with my driveshaft. I ditched the stock washers and used loctite red, which is a pretty hokey fix, getting the right bolts would be the right thing to do. Holds fine but might be a PITA if you have to rotate your driveshaft.

08-25-2014, 06:57 PM	#9
Akari Senior Member Join Date: Oct 2013 Drives: 2013 DGM BRZ Location: Auburn, WA Posts: 417 Thanks: 181 Thanked 149 Times in 97 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	Go spend $4 on bolts, that's not safe at all.

08-25-2014, 08:13 PM	#10
puma crew chief Join Date: Mar 2014 Drives: Race car FR-S Location: Quebec Posts: 378 Thanks: 6 Thanked 189 Times in 82 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	yeah the thing is to find bolts with a grade high enough for the job. I don't have such a shop around. I must admit i didn't even think about taking the washer off, that would give me something like 2 threads in addition.

08-25-2014, 08:55 PM	#12
kodyo Senior Member Join Date: Jan 2013 Drives: Scion FR-S Location: Los Angeles Posts: 686 Thanks: 597 Thanked 257 Times in 174 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	They aren't standard bolts. They are partially threaded so shear load isn't taken through the thread. You'd probably be ok to use a little loctite and remove the washer if it gives you enough engagement.

08-25-2014, 10:07 PM	#14
White64Goat Senior Member Join Date: Jun 2012 Drives: 13 BRZ CBS LTD MT, 02 WRX Location: Fred. Co. Md. Posts: 2,351 Thanks: 65 Thanked 1,113 Times in 628 Posts Mentioned: 19 Post(s) Tagged: 1 Thread(s)	Nope. Replace with correct length. Probably grade 8 if I had to guess.

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