metric nut and bolt strength

Started by TheTransporter, August 07, 2007, 06:01:31 PM

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TheTransporter

August 07, 2007, 06:01:31 PM
so what is 8.8 equal to in american standard strength wise? :dunno:
you think nobody cares about you? try missing a couple of car payments.

79coyotefrg

#1
August 07, 2007, 06:03:00 PM
its  8.8   meaning its  slightly  harder than grade 8
AR-TTORA founder 22R bored.060,LCE stage II race cam http://pure-gas.org/    32/36weber, :driving: Marlin 1200 NON ceramic clutch, L52SHD+dualcase #2919, cable-locker, Yukon 5.29 gears, 35's, Allpro ebrake, front springs, and high steer, F150rears    RIP Nitro 9-29-07 :(  I sure miss him :down: MarlinCrawlerInc IS NOT affiliated with TrailGear in any way

TheTransporter

#2
August 07, 2007, 06:42:24 PM
somehow I don't think thats right.
you think nobody cares about you? try missing a couple of car payments.

Duffil

#3
August 07, 2007, 07:10:05 PM
Nope sorry.  Metric Grade 8.8 is SAE Grade 5.  Metric 10.9 is equivalent to SAE Grade 8.

TheTransporter

#4
August 07, 2007, 07:24:59 PM
no store that I have found carries anything bigger than 8.8. Where can I find stronger metric fasteners at? :dunno:
you think nobody cares about you? try missing a couple of car payments.

Duffil

#5
August 07, 2007, 07:32:11 PM
Quote from: TheTransporter on August 07, 2007, 07:24:59 PM
no store that I have found carries anything bigger than 8.8. Where can I find stronger metric fasteners at? :dunno:
well, I know any napa can order them.  Do you have a Fastenal or similar locale to you? Grainger?

TheTransporter

#6
August 07, 2007, 08:01:27 PM
yea, we have Grainger and Napa
you think nobody cares about you? try missing a couple of car payments.

~tc~

#7
August 07, 2007, 08:14:10 PM
Quote from: Duffil on August 07, 2007, 07:10:05 PM
Nope sorry.  Metric Grade 8.8 is SAE Grade 5.  Metric 10.9 is equivalent to SAE Grade 8.

That is correct. Note that JIS (Japanese) calls them Grade 8 and Grade 10 respectively.

Ace Hardware around here carries some 10.9, but mostly coarse thread, and if you're going into a factory hole, it's probably fine thread. I usually get them from Fastenal. The common size is M12-1.25x30mm IIRC - order A BUNCH, they are good to have as spares. Used for the CV flange to stub axle, brake caliper, tranny crossmember, and a couple other places (17mm wrench size).

Socket head cap screws are also available in a stronger yet 12.9, but I would be concerned about them being too brittle and actually fracturing easier in our type of usage.
'93 4Runner, V6/MT ARB's, armor, 33's, no lift!

President, CO Chapter TTORA www.cottora.org

emsvitil

#8
August 07, 2007, 10:15:46 PM
Ed
SoCal
86 SR5 XtraCab
22RE  W56B
31x10.50R15

Duffil

#9
August 08, 2007, 12:52:39 AM
Quote from: ~tc~ on August 07, 2007, 08:14:10 PM
That is correct. Note that JIS (Japanese) calls them Grade 8 and Grade 10 respectively.

Ace Hardware around here carries some 10.9, but mostly coarse thread, and if you're going into a factory hole, it's probably fine thread. I usually get them from Fastenal. The common size is M12-1.25x30mm IIRC - order A BUNCH, they are good to have as spares. Used for the CV flange to stub axle, brake caliper, tranny crossmember, and a couple other places (17mm wrench size).

Socket head cap screws are also available in a stronger yet 12.9, but I would be concerned about them being too brittle and actually fracturing easier in our type of usage.

:headscratch: JIS simply means Japanese Industrial Standard. A JIS bolt will have a smaller head than a typical metric bolt; ie: 14mm JIS vs 17mm STD. if by CV flange to stub axle you mean the spindle bolts, those are 10mm (14mm head) the caliper mounting bolts are 14mm (17mm head)

79coyotefrg

#10
August 08, 2007, 07:30:37 PM
Quote from: 79coyotefrg on August 07, 2007, 06:03:00 PM
its  8.8   meaning its  slightly  harder than grade 8
Quote from: Duffil on August 07, 2007, 07:10:05 PM
Nope sorry.  Metric Grade 8.8 is SAE Grade 5.  Metric 10.9 is equivalent to SAE Grade 8.
hmm  well  i know i had  sheered off a driveshaft bolt that was  us grade 8  and replaced it with a  stock toyota bolt with 8.8 on the head  and its never broke ,  well till i got my dual cases  and replaced them all with  the  same bolts Marlin sells  that i got from a 88 truck

oh well learn somethin new everyday
AR-TTORA founder 22R bored.060,LCE stage II race cam http://pure-gas.org/    32/36weber, :driving: Marlin 1200 NON ceramic clutch, L52SHD+dualcase #2919, cable-locker, Yukon 5.29 gears, 35's, Allpro ebrake, front springs, and high steer, F150rears    RIP Nitro 9-29-07 :(  I sure miss him :down: MarlinCrawlerInc IS NOT affiliated with TrailGear in any way

Duffil

#11
August 08, 2007, 07:37:42 PM
Quote from: 79coyotefrg on August 08, 2007, 07:30:37 PM
hmm  well  i know i had  sheered off a driveshaft bolt that was  us grade 8  and replaced it with a  stock toyota bolt with 8.8 on the head  and its never broke ,  well till i got my dual cases  and replaced them all with  the  same bolts Marlin sells  that i got from a 88 truck

oh well learn somethin new everyday
that's because of the shoulder size on a toy driveshaft bolt.  a reg 3/8 bolt will have a little slop in it, and consequently blow apart when the flanges twist.

I had one of my customers do that:
him: Hey, Rex what size are toy driveshaft bolts.
me:  they have a special sixed shoulder.  go to the dealer.
him: Nope, I'll get some grade 8 from ACE hardware.
next day
him: hey, you know, I broke those bolts.  can you get me some from Toyota?
me: :rofl: :haha:

~tc~

#12
August 08, 2007, 08:23:58 PM
Quote from: Duffil on August 08, 2007, 12:52:39 AMif by CV flange to stub axle you mean the spindle bolts

No, I mean the bolts (well, studs from the factory) that hold the CV flange to the stub axle flange. If you knock those studs out, and replace with bolts it makes changing CV's MUCH easier. The bolts you need are exactly the same as the caliper and crossmember bolts.
'93 4Runner, V6/MT ARB's, armor, 33's, no lift!

President, CO Chapter TTORA www.cottora.org

Duffil

#13
August 08, 2007, 08:27:41 PM
Quote from: ~tc~ on August 08, 2007, 08:23:58 PM
No, I mean the bolts (well, studs from the factory) that hold the CV flange to the stub axle flange. If you knock those studs out, and replace with bolts it makes changing CV's MUCH easier. The bolts you need are exactly the same as the caliper and crossmember bolts.
What are you working on? sorry, but I am not following what you mean by CV to stub axle flange.  The only CV that I know of on an SA truck is on the front driveshaft.

TheTransporter

#14
August 09, 2007, 05:37:10 PM
I think he is talking about an IFS truck.
you think nobody cares about you? try missing a couple of car payments.

Duffil

#15
August 09, 2007, 06:30:05 PM
Quote from: TheTransporter on August 09, 2007, 05:37:10 PM
I think he is talking about an IFS truck.
:smack:

~tc~

#16
August 09, 2007, 08:10:05 PM
Yes, I am - sorry for the confusion
'93 4Runner, V6/MT ARB's, armor, 33's, no lift!

President, CO Chapter TTORA www.cottora.org

TheTransporter

#17
August 09, 2007, 08:48:39 PM
so are all the 8.8 bolts that hold the leaf springs on strong enough. I think they would be due to the size of them, but i could be wrong.
you think nobody cares about you? try missing a couple of car payments.
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