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#4643494 - 01/22/18 10:06 PM Strength rating of stainless steel/galvanized bolt
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4858
Loc: 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.
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#4643542 - 01/22/18 10:57 PM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
andyd Offline


Registered: 09/25/04
Posts: 7158
Loc: Marshfield , MA
Most Galvy bolts are grade 2. Stainless I don't know about.
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#4643560 - 01/22/18 11:19 PM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
tom slick Offline


Registered: 05/26/03
Posts: 9301
Loc: Central Coast, Calif.
Most stainless is less than grade 5.
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#4643672 - 01/23/18 06:41 AM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
Trav Offline


Registered: 11/20/06
Posts: 18896
Loc: 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
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#4643707 - 01/23/18 07:31 AM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
64bawagon Offline


Registered: 01/10/17
Posts: 167
Loc: 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.
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#4643724 - 01/23/18 07:47 AM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
Cujet Offline


Registered: 02/15/03
Posts: 7163
Loc: 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.


Edited by Cujet (01/23/18 07:49 AM)
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#4643789 - 01/23/18 08:38 AM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
Blkstanger Offline


Registered: 08/13/11
Posts: 1948
Loc: 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.
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#4643844 - 01/23/18 09:15 AM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
SHOZ Offline


Registered: 06/28/03
Posts: 5750
Loc: 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
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#4643931 - 01/23/18 10:12 AM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
andyd Offline


Registered: 09/25/04
Posts: 7158
Loc: 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.


Edited by andyd (01/23/18 10:15 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

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#4661985 - 02/10/18 01:36 PM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4858
Loc: 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


Edited by motor_oil_madman (02/10/18 01:40 PM)
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#4661991 - 02/10/18 01:44 PM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4858
Loc: 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.
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#4662029 - 02/10/18 02:25 PM Re: Strength rating of stainless steel/galvanized bolt [Re: SHOZ]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: 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?
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#4662032 - 02/10/18 02:27 PM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: 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."

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#4662033 - 02/10/18 02:28 PM Re: Strength rating of stainless steel/galvanized bolt [Re: Linctex]
SHOZ Offline


Registered: 06/28/03
Posts: 5750
Loc: 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.
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2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4662354 - 02/10/18 09:25 PM Re: Strength rating of stainless steel/galvanized bolt [Re: motor_oil_madman]
eljefino Online   content


Registered: 06/15/03
Posts: 32651
Loc: 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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