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06-12-2013, 03:06 PM
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#1 |
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Registered User
 Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
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Which grade of bolts
When replacing old tired bolts and nuts, which grade do you use for things that hang off the motor? Like power steering pumps, alternators... Grade 2, 5, or 8?
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06-12-2013, 03:11 PM
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#2 |
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Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: Which grade of bolts
Grade 8 or OEM usually.
Grades 8 doesn't cost that much more. I would avoid grade 2. Often OEM bolts have grade identifier. |
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06-12-2013, 03:12 PM
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#3 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,134
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Re: Which grade of bolts
Grade 8 as much as possible. Not that much more expensive.
__________________
'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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06-12-2013, 03:13 PM
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#4 |
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Registered User
Join Date: Mar 2011
Location: bolivar, mo
Posts: 839
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Re: Which grade of bolts
I always use grade 8 anywhere possible---need it or not.
__________________
1997 shortie stepside 1968 short stepside 1966 mustang 1966 chevelle ss Dont always go the cheapest route--You can save yourself into the poorhouse! My Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=489030 |
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06-12-2013, 03:14 PM
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#5 |
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Registered User
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Which grade of bolts
YES grade 8. If it is in high moisture areas, stainless is good too. They are in between 5 and 8 for hardness but also resist rust. I use a few of them but they are pricier.
__________________
1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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06-12-2013, 03:17 PM
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#6 |
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Registered User
Join Date: May 2013
Location: Godfrey, IL
Posts: 220
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Re: Which grade of bolts
Grade 8 - always.
I've lowered suspension on more than a dozen vehicles (granted, they were s-10's  ) But you always use Grade 8
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06-12-2013, 03:19 PM
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#7 |
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Registered User
Join Date: Apr 2013
Location: homestead florida
Posts: 312
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Re: Which grade of bolts
always grade 8
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06-12-2013, 03:28 PM
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#8 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Which grade of bolts
aircraft grade stainless for most things that mount on the motor been doing it over 50years(pop worked for grumman) never had a problem with stuff fallin off due to bolt failures// i think grade 8 is way overrated for most things that guys use them for
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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06-12-2013, 04:07 PM
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#9 |
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Registered User
Join Date: Apr 2011
Location: formerly NY currentlyNC
Posts: 389
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Re: Which grade of bolts
factory used grade 5 for everything except high stress stuff like flywheel,clutch,and u joints...no reason not to upgrade to 8...but don't feel you have to run out and buy a grade 8 bolt when you have a 5 that fits
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06-12-2013, 04:10 PM
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#10 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: Which grade of bolts
Grade 5 for brackets off the engine (alt, power steering, A/C, etc). Grade 8 is overkill for those.
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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06-12-2013, 04:11 PM
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#11 |
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Registered User
Join Date: Apr 2011
Location: formerly NY currentlyNC
Posts: 389
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Re: Which grade of bolts
don't know where the coffee cup came from...I never clicked on it !
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06-12-2013, 04:28 PM
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#12 |
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Registered User
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Which grade of bolts
There are some things that may not be considered here. That is that grade 5 has changed. The bolts USED to be all US made when our trucks were assembled. US made unplated bolts had a higher tolerence than the foreign made of the time. They would be +30% -5% as I recall. That has changed.
I have had 3/8 grade 5 bolts break at 25 ft/lbs of torque DRY. Also the grade 5 of the day were not zinc plated in most cases which reduces strength by about 15%.... Spend the extra 15¢ a bolt and get grade 8.
__________________
1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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06-12-2013, 05:14 PM
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#13 |
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Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Which grade of bolts
stainless for the engine!
__________________
John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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06-12-2013, 07:47 PM
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#14 |
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Registered User
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
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Re: Which grade of bolts
Looks like I will be using grade 8.
Follow up question: Where do you buy them? Locally I have been picking up grade 2, 5, and 8 at Orscheln' and Race Brothers - both farm supply stores that sell the different grades in bulk bins. Grade 5 is $2.99 per pound, grade 8 is $3.99. Should I be worried about buying from the bulk bins? Posted via Mobile Device |
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06-12-2013, 07:50 PM
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#15 | |
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Registered User
Join Date: Feb 2003
Location: Marshfield, MO
Posts: 355
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Re: Which grade of bolts
Quote:
Posted via Mobile Device |
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06-12-2013, 08:31 PM
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#16 |
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Registered User
Join Date: Mar 2011
Location: bolivar, mo
Posts: 839
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Re: Which grade of bolts
Nope,, just inspect what you buy. people have a tendency to look and put back "somewhere".
__________________
1997 shortie stepside 1968 short stepside 1966 mustang 1966 chevelle ss Dont always go the cheapest route--You can save yourself into the poorhouse! My Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=489030 |
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