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Strength rating of stainless steel/galvanized bolt #4643494
01/22/18 11:06 PM
01/22/18 11:06 PM
Joined: Nov 2009
Posts: 4,942
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,942
Houston, Texas
This has been my life long question that has never gotten answered. On a regular bolt they put markings on the head, but on a stainless steel and galvanized bolts they don't seem to put the same rating. Anyone have an answer? Thanks.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643542
01/22/18 11:57 PM
01/22/18 11:57 PM
Joined: Sep 2004
Posts: 7,528
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,528
Marshfield , MA
Most Galvy bolts are grade 2. Stainless I don't know about.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643560
01/23/18 12:19 AM
01/23/18 12:19 AM
Joined: May 2003
Posts: 9,336
Central Coast, Calif.
tom slick Online sleepy
tom slick  Online Sleepy
Joined: May 2003
Posts: 9,336
Central Coast, Calif.
Most stainless is less than grade 5.


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643672
01/23/18 07:41 AM
01/23/18 07:41 AM
Joined: Nov 2006
Posts: 19,920
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,920
MA, Mittelfranken.de
There is hardened stainless, this will tell you everything you want to know. BTW Some Ace hardware stores carry hardened stainless.

http://www.ssina.com/download_a_file/fasteners.pdf


ASE L1, Master. Deutsch Meisterbrief.
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643707
01/23/18 08:31 AM
01/23/18 08:31 AM
Joined: Jan 2017
Posts: 174
Michigan
64bawagon Offline
64bawagon  Offline
Joined: Jan 2017
Posts: 174
Michigan
Most hardware grade stainless is 18-8 and will be somewhere equivalent to a grade 5 in strength. there are many other grades of stainless that are available as specialties for specific applications but usually not available in general fastener sales. Anything is possible if you have enough quantity and $$$
Galvanized is simply a coating, most used on grade 2 items but could be used on higher grades. The fasteners have to be made to different specs to account for the thickness of the galvanized coating.


05 Duramax Chevy(SOLD), 64 Chevy wagon, 10 Jeep Wrangler, 17 Equinox (rental), 18 Silverado 1/2 ton
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643724
01/23/18 08:47 AM
01/23/18 08:47 AM
Joined: Feb 2003
Posts: 7,427
Jupiter, Florida
Cujet Offline
Cujet  Offline
Joined: Feb 2003
Posts: 7,427
Jupiter, Florida
With regard to aircraft hardware vs hardware store:

AN bolts (such as an AN4) are garden variety aircraft bolts
AN bolts (such as an AN4) made of CRES (corrosion resistant steel) (stainless) are designed to meet the exact same specs.

All AN Bolts meet minimum Tensile Strength Values of 125,000 PSI
Commercial Grade 8 Bolts Have a Comparitive Strength of 150,000 PSI
Commercial Grade 5 Bolts Have a Comparitive Strength of 120,000 PSI
Dropping to 110.000 PSI for Diameters Greater Than 1-Inch
Commercial Grade 2 Bolts Have a Comparitive Strength of 70.000 PSI
Dropping to 60.000 PSI for Diameters Greater Than 3/4"

The reason I bring this up is that "hardware store" 18-8 stainless or even marine stainless can be as low as 20,000 PSI depending on quality. Though it is much more typical to see hardware store stainless at 65,000 PSI tensile strength.

Last edited by Cujet; 01/23/18 08:49 AM.

People who count on their fingers should maintain a discreet silence.
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643789
01/23/18 09:38 AM
01/23/18 09:38 AM
Joined: Aug 2011
Posts: 2,022
Lakeside, CA
Blkstanger Offline
Blkstanger  Offline
Joined: Aug 2011
Posts: 2,022
Lakeside, CA
The only thing I would use Stainless on is something non critical. They do make a hardened stainless but it's not common and you wont find it in a regular hardware store. I like Cad plated if I need corrosion protection.


99 Jeep WJ 4.7 190,000 Maxlife 10w30, Fram Ultra.
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643844
01/23/18 10:15 AM
01/23/18 10:15 AM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
Illinois
I use a lot of 316 stainless. Especially for exhaust where I use a SS bolt and a hardened regular steel nut. SS on SS and exhaust will sometimes gall. But if I want a non corrosion bolt anywhere else the 316 SS is what I use.

Mechanical Requirements for Stainless Steel & Non-Ferrous Fasteners


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4643931
01/23/18 11:12 AM
01/23/18 11:12 AM
Joined: Sep 2004
Posts: 7,528
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,528
Marshfield , MA
As usual, this knowledge was gained the hard way. I used a garden variety 3/8 stainless bolt as the pivot on an alternator. Tightening it up, it sheared. I was beginning to think I would grow old and die under that darned Jeep before I drilled it out. Lesson learned. No more stainless. When I part out a BMW, I save every nut and bolt. The hardware is mostly cad plated. or phosphor coated. Makes the stuff holding the Rat together look like junk.

PS when drilling stainless go very slowly and use tons of oil or you will blue the drill bit and ruin it.

Last edited by andyd; 01/23/18 11:15 AM.

'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4661985
02/10/18 02:36 PM
02/10/18 02:36 PM
Joined: Nov 2009
Posts: 4,942
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,942
Houston, Texas
Reason I ask is on my boat trailer they used a standard zinc plated grade 5 bolt to hold on the leaf springs and the front and rear cross members. These are heavily corroded. I'm putting new leaf springs on and would prefer something other than a zinc plated bolt

Last edited by motor_oil_madman; 02/10/18 02:40 PM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4661991
02/10/18 02:44 PM
02/10/18 02:44 PM
Joined: Nov 2009
Posts: 4,942
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,942
Houston, Texas
Should I just go with a cadium plated grade 8? I'm just don't want to be cutting these off in 3 years of salt water immersion.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Strength rating of stainless steel/galvanized bolt [Re: SHOZ] #4662029
02/10/18 03:25 PM
02/10/18 03:25 PM
Joined: Dec 2016
Posts: 6,235
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,235
Waco, TX
Originally Posted By: SHOZ
I use a lot of 316 stainless. Especially for exhaust where I use a SS bolt and a hardened regular steel nut. SS on SS and exhaust will sometimes gall.


Why don't you use common brass nuts designed for exhaust systems instead?


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4662032
02/10/18 03:27 PM
02/10/18 03:27 PM
Joined: Dec 2016
Posts: 6,235
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,235
Waco, TX
Originally Posted By: motor_oil_madman
Should I just go with a cadium plated grade 8? I'm just don't want to be cutting these off in 3 years of salt water immersion.


I do an ANNUAL inspection of my boat trailer,
and replace any fasteners that need replacing on a yearly basis if needed.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Strength rating of stainless steel/galvanized bolt [Re: Linctex] #4662033
02/10/18 03:28 PM
02/10/18 03:28 PM
Joined: Jun 2003
Posts: 5,921
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,921
Illinois
Originally Posted By: Linctex
Originally Posted By: SHOZ
I use a lot of 316 stainless. Especially for exhaust where I use a SS bolt and a hardened regular steel nut. SS on SS and exhaust will sometimes gall.


Why don't you use common brass nuts designed for exhaust systems instead?
I have a quantity of the correct metric hardened nuts from the local farm store, buy them by the pound. Brass in metric threads are not common here.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman] #4662354
02/10/18 10:25 PM
02/10/18 10:25 PM
Joined: Jun 2003
Posts: 33,096
ME
eljefino Online content
eljefino  Online Content
Joined: Jun 2003
Posts: 33,096
ME
Originally Posted By: motor_oil_madman
Reason I ask is on my boat trailer they used a standard zinc plated grade 5 bolt to hold on the leaf springs and the front and rear cross members. These are heavily corroded. I'm putting new leaf springs on and would prefer something other than a zinc plated bolt


If your spring shackle's zinc coated as well I would put back in what came out so you don't get galvanic corrosion. Boat trailers are high maintenance due to the harsh environment they live in.


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