Strength of stainless bolts

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Graham Knight
Posts: 52
Joined: Mon Feb 04, 2002 4:58 pm

Strength of stainless bolts

Post by Graham Knight » Fri Nov 24, 2017 12:53 am

Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners.easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham
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Norman Verona
Posts: 107
Joined: Sun May 17, 2015 4:21 am

Re: Strength of stainless bolts

Post by Norman Verona » Fri Nov 24, 2017 1:22 am

Graham,

 

Stainless steel is soft and shouldn t be used on anything, like suspension or steering which requires high tensile steel strength.

 

If you have used SS fixing on anything that takes load then I would strongly advise you change them for HS as soon as possible.

 

 

[b][i]Norman Verona[/i][/b]

11 Cherry Close, Royston, South Yorkshire S71 4LZ

Phone: 0044 (0)1226 728811

Mob: 0044 (0)741 9905 741

[b][i]Web: www.frenchblat.com[/i][/b]

 

[b]From:[/b] mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com] [b]On Behalf Of [/b]Graham Knight graham.knight5@gmail.com [mg-tabc] [b]Sent:[/b] 24 November 2017 08:54 [b]To:[/b] mg-tabc@yahoogroups.com [b]Subject:[/b] [mg-tabc] Strength of stainless bolts

 

 

Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners.easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham

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M. P.
Posts: 23
Joined: Wed Oct 14, 2015 9:50 pm

Re: Strength of stainless bolts

Post by M. P. » Fri Nov 24, 2017 1:31 am

Graham:  Norman has you pretty much spot on with his comments on this subject.  I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware.  There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5.  Grade 8 is available  but limited in availability and selections.  If I were you, I'd tend to follow Norm's advice.   Sent from Yahoo Mail on Android
On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc]mg-tabc-noreply@yahoogroups.com> wrote:   Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners.easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham #ygrps-yiv-1293846604 #ygrps-yiv-1293846604yiv1790549910 #ygrps-yiv-1293846604yiv1790549910 -- #ygrps-yiv-1293846604yiv1790549910ygrp-mkp { border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;} #ygrps-yiv-1293846604 #ygrps-yiv-1293846604yiv1790549910 #ygrps-yiv-1293846604yiv1790549910ygrp-mkp hr { border:1px solid #d8d8d8;} #ygrps-yiv-1293846604 #ygrps-yiv-1293846604yiv1790549910 #ygrps-yiv-1293846604yiv1790549910ygrp-mkp #ygrps-yiv-1293846604yiv1790549910hd { color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;} #ygrps-yiv-1293846604 #ygrps-yiv-1293846604yiv1790549910 #ygrps-yiv-1293846604yiv1790549910ygrp-mkp #ygrps-yiv-1293846604yiv1790549910ads { margin-bottom:10px;} #ygrps-yiv-1293846604 #ygrps-yiv-1293846604yiv1790549910 #ygrps-yiv-1293846604yiv1790549910ygrp-mkp .ygrps-yiv-1293846604yiv1790549910ad { padding:0 0;} #ygrps-yiv-1293846604 #ygrps-yiv-1293846604yiv1790549910 #ygrps-yiv-1293846604yiv1790549910ygrp-mkp 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Roger Furneaux
Posts: 292
Joined: Mon Dec 13, 1999 4:38 pm

Re: Strength of stainless bolts

Post by Roger Furneaux » Fri Nov 24, 2017 4:04 am

I don't think you will find stainless steel bolts in strength grades, only as A2 or A4, which refers to their corrosion resistance. SS is banned (don't know if it is actually enshrined in EU law) from being used in any safety related situations: apart from lack of ternsile strength it also suffers from work-hardening (maybe John Kallend can tell us more about this - are you there John?). On our cars, the only obvious places to use them are holding the running-boards, and in places where a chrome-plated brass screw was used originally (such as the dashboard). Polished SS looks as good as chrome and will never tarnish. FYI I keep good stocks of every bolt and stud used on our cars in zinc-plated HT steel and some SS. oc[b]T[/b]agonally Roger
On Fri, Nov 24, 2017 at 9:31 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: [u][/u] Graham: Norman has you pretty much spot on with his comments on this subject. I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware. There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5. Grade 8 is available but limited in availability and selections. If I were you, I'd tend to follow Norm's advice. Sent from Yahoo Mail on Android On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc]mg-tabc-noreply@yahoogroups.com> wrote: Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners. easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham
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Stephen D Stierman
Posts: 63
Joined: Fri Dec 26, 2003 5:04 am

Re: Strength of stainless bolts

Post by Stephen D Stierman » Fri Nov 24, 2017 4:18 am

The beauty of stainless is that you can take a stainless bolt and with nothing more than a bench grinder, sandpaper and buffer, turn it into an oval head slotted windshield plinth bolt in a short time.  All those pesky, rather pricey, chrome plated bolts can be turned out without much trouble at all and they don't rust or corrode.Steve TC2911 From: "Roger Furneaux roger.46tc@gmail.com [mg-tabc]" mg-tabc-noreply@yahoogroups.com> [b]To:[/b] "imabystander@yahoo.com" imabystander@yahoo.com> [b]Cc:[/b] "mg-tabc-noreply@yahoogroups.com" mg-tabc-noreply@yahoogroups.com>; "mg-tabc@yahoogroups.com" mg-tabc@yahoogroups.com> [b]Sent:[/b] Friday, November 24, 2017 7:04 AM [b]Subject:[/b] Re: [mg-tabc] Strength of stainless bolts   I don't think you will find stainless steel bolts in strength grades, only as A2 or A4, which refers to their corrosion resistance. SS is banned (don't know if it is actually enshrined in EU law) from being used in any safety related situations: apart from lack of ternsile strength it also suffers from work-hardening (maybe John Kallend can tell us more about this - are you there John?). On our cars, the only obvious places to use them are holding the running-boards, and in places where a chrome-plated brass screw was used originally (such as the dashboard). Polished SS looks as good as chrome and will never tarnish. FYI I keep good stocks of every bolt and stud used on our cars in zinc-plated HT steel  and  some SS.  oc[b]T[/b]agonally Roger On Fri, Nov 24, 2017 at 9:31 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:
[u][/u]   Graham:  Norman has you pretty much spot on with his comments on this subject.  I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware.  There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5.  Grade 8 is available  but limited in availability and selections.  If I were you, I'd tend to follow Norm's advice.   Sent from Yahoo Mail on Android On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc]mg-tabc-noreply@yahoogroups.com> wrote:   Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners. easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham
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Graham Knight
Posts: 52
Joined: Mon Feb 04, 2002 4:58 pm

Re: Strength of stainless bolts

Post by Graham Knight » Fri Nov 24, 2017 4:38 am

Dear All, Thanks for your advice on this. Graham On 24/11/17 12:17, Stephen D Stierman morgan7709@sbcglobal.net [mg-tabc] wrote:
The beauty of stainless is that you can take a stainless bolt and with nothing more than a bench grinder, sandpaper and buffer, turn it into an oval head slotted windshield plinth bolt in a short time. All those pesky, rather pricey, chrome plated bolts can be turned out without much trouble at all and they don't rust or corrode. Steve TC2911 From: "Roger Furneaux roger.46tc@gmail.com [mg-tabc]" mg-tabc-noreply@yahoogroups.com [b]To:[/b] imabystander@yahoo.com imabystander@yahoo.com [b]Cc:[/b] mg-tabc-noreply@yahoogroups.com mg-tabc-noreply@yahoogroups.com; mg-tabc@yahoogroups.com mg-tabc@yahoogroups.com [b]Sent:[/b] Friday, November 24, 2017 7:04 AM [b]Subject:[/b] Re: [mg-tabc] Strength of stainless bolts I don't think you will find stainless steel bolts in strength grades, only as A2 or A4, which refers to their corrosion resistance. SS is banned (don't know if it is actually enshrined in EU law) from being used in any safety related situations: apart from lack of ternsile strength it also suffers from work-hardening (maybe John Kallend can tell us more about this - are you there John?). On our cars, the only obvious places to use them are holding the running-boards, and in places where a chrome-plated brass screw was used originally (such as the dashboard). Polished SS looks as good as chrome and will never tarnish. FYI I keep good stocks of every bolt and stud used on our cars in zinc-plated HT steel and some SS. oc[b]T[/b]agonally Roger On Fri, Nov 24, 2017 at 9:31 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: Graham: Norman has you pretty much spot on with his comments on this subject. I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware. There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5. Grade 8 is available but limited in availability and selections. If I were you, I'd tend to follow Norm's advice. Sent from Yahoo Mail on Android On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners. easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham
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diecuts2333
Posts: 38
Joined: Thu Oct 21, 2004 6:43 am

Re: Strength of stainless bolts

Post by diecuts2333 » Fri Nov 24, 2017 5:15 am

Agreed!   Stainless is low strength applications only.     Stainless is fine for holding on firewall bulkheads, wings, brackets, etc .  The closest I have come to using stainless without issue in suspension related areas are the 3 bolts in the steering coupling assy. that connects the TD steering column to the rack and pinion,  and still not happy about doing that......   Lee Jacobsen, Dearborn, MI    TC0780 -----Original Message----- From: 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> To: mg-tabc-noreply mg-tabc-noreply@yahoogroups.com>; mg-tabc mg-tabc@yahoogroups.com> Sent: Fri, Nov 24, 2017 4:31 am Subject: Re: [mg-tabc] Strength of stainless bolts #ygrps-yiv-1777647272 #ygrps-yiv-1777647272AOLMsgPart_2_5d5fc209-36ed-4402-98c1-c94618c9e6f2 td{color:black;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody .ygrps-yiv-1777647272aolmail_ygrp-photo-title{clear:both;font-size:smaller;height:15px;overflow:hidden;text-align:center;width:75px;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_ygrp-photo{background-position:center;background-repeat:no-repeat;background-color:white;border:1px solid black;height:62px;width:62px;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_photo-title a, #ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_photo-title a:active, #ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_photo-title a:hover, #ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_photo-title a:visited {text-decoration:none;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_attach-table div.ygrps-yiv-1777647272aolmail_attach-row {clear:both;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_attach-table div.ygrps-yiv-1777647272aolmail_attach-row div {float:left;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody p {clear:both;padding:15px 0 3px 0;overflow:hidden;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_ygrp-file {width:30px;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_attach-table div.ygrps-yiv-1777647272aolmail_attach-row div div a {text-decoration:none;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_attach-table div.ygrps-yiv-1777647272aolmail_attach-row div div span {font-weight:normal;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody div.ygrps-yiv-1777647272aolmail_ygrp-file-title {font-weight:bold;}#ygrps-yiv-1777647272 #ygrps-yiv-1777647272AOLMsgPart_2_5d5fc209-36ed-4402-98c1-c94618c9e6f2 td{color:black;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_ygrp-mkp hr {border:1px solid #d8d8d8;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_ygrp-mkp #ygrps-yiv-1777647272aolmail_hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_ygrp-mkp #ygrps-yiv-1777647272aolmail_ads {margin-bottom:10px;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_ygrp-mkp .ygrps-yiv-1777647272aolmail_ad {padding:0 0;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_ygrp-mkp .ygrps-yiv-1777647272aolmail_ad p {margin:0;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_ygrp-mkp .ygrps-yiv-1777647272aolmail_ad a {color:#0000ff;text-decoration:none;} Graham:  Norman has you pretty much spot on with his comments on this subject.  I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware.  There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5.  Grade 8 is available  but limited in availability and selections.  If I were you, I'd tend to follow Norm's advice.   Sent from Yahoo Mail on Android
On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:   Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners.easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham #ygrps-yiv-1777647272 #ygrps-yiv-1777647272AOLMsgPart_2_5d5fc209-36ed-4402-98c1-c94618c9e6f2 td{color:black;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_yiv1790549910 #ygrps-yiv-1777647272aolmail_yiv1790549910 -- #ygrps-yiv-1777647272aolmail_yiv1790549910ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_yiv1790549910 #ygrps-yiv-1777647272aolmail_yiv1790549910ygrp-mkp hr {border:1px solid #d8d8d8;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_yiv1790549910 #ygrps-yiv-1777647272aolmail_yiv1790549910ygrp-mkp #ygrps-yiv-1777647272aolmail_yiv1790549910hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#ygrps-yiv-1777647272 .ygrps-yiv-1777647272aolReplacedBody #ygrps-yiv-1777647272aolmail_yiv1790549910 #ygrps-yiv-1777647272aolmail_yiv1790549910ygrp-mkp 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M. P.
Posts: 23
Joined: Wed Oct 14, 2015 9:50 pm

Re: Strength of stainless bolts

Post by M. P. » Fri Nov 24, 2017 6:33 am

Yep Roger, I stand corrected, although most sites offering SS fasteners list them according to their equivalency to Grade 3, 5, 8.8, 10.9 etc...  McMaster Carr who is arguably one of the most common hardware suppliers in the States offers SS hardware in 18-8  Hardness B74  Tensile 70,000psi,  316   Hardness B70   Tensile 70,000psi, Alloy 20  Hardness B80  Tensile 80,000psi, A286  hardness C24  Tensile 130,000psi, HS 17-4PH  Hardness C28  Tensile 130,000psi and 410  Hardness Grade 5 equiv

 The Grade 8 or better equivalent SS hardware typically is not in open stock but is specialty order to mainly the Chemical Industry where high corrosion resistance is required along with high strength.  

Ref: 

[b]SAE Grade 8[/b] bolt capability in yield (stretch) = 130,000 lbs / in2 , SAE Grade 8 bolt capability in tension (failure) = 150,000 lbs / in2, 

SAE Grade 5 bolt capability in yield (stretch) = 92,000 lbs / in2,  SAE Grade 5 bolt capability in tension (failure) = 120,000 lbs / in2 

Metric Class 8.8  tension 110,000psi ,  Metric Class 10.9  Tension = 150,000psi,  Metric class 12.9 Tension = 174,000psi

I wonder if there is a document available that gives the BSW/BSF head markings/strength identification by location on our cars and likewise the mad metric head markings by location on the mechanicals as well.  That would be interesting as a comparison tool.  

Bottom line availability says that for low to medium strength applications SS is a viable option at the owners discretion...All others better to be safe than sorry....

On Friday , November 24 , 2017 06 : 04 : 13 AM CST, Roger Furneaux roger.46tc@gmail.com> wrote:
I don't think you will find stainless steel bolts in strength grades, only as A2 or A4, which refers to their corrosion resistance. SS is banned (don't know if it is actually enshrined in EU law) from being used in any safety related situations: apart from lack of ternsile strength it also suffers from work-hardening (maybe John Kallend can tell us more about this - are you there John?). On our cars, the only obvious places to use them are holding the running-boards, and in places where a chrome-plated brass screw was used originally (such as the dashboard). Polished SS looks as good as chrome and will never tarnish. FYI I keep good stocks of every bolt and stud used on our cars in zinc-plated HT steel  and  some SS.  oc[b]T[/b]agonally Roger On Fri, Nov 24, 2017 at 9:31 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: [u][/u]   Graham:  Norman has you pretty much spot on with his comments on this subject.  I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware.  There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5.  Grade 8 is available  but limited in availability and selections.  If I were you, I'd tend to follow Norm's advice.   Sent from Yahoo Mail on Android On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc]mg-tabc-noreply@yahoogroups.com> wrote:   Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners. easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham
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Usaj24@earthlink.net
Posts: 14
Joined: Fri Jun 17, 2016 3:11 pm

Re: Strength of stainless bolts

Post by Usaj24@earthlink.net » Fri Nov 24, 2017 8:05 am

Sent from my iPad
On Nov 24, 2017, at 11:01 AM, "Usaj24@earthlink.net" Usaj24@earthlink.net> wrote:
A-2 S/S is comparable  to domestic 302 & 304  in corrosion resistance. A-4 is comparable to type 316 for CR. For higher strength, fatigue resistant, durable & tougher S/S fasteners, do not overlook ARP's "Stainless 300", 140k psi YS & 170-190k psi UTS.Their Custom 450 S/S is rated at 150k psi & 170k psi UTS. Suitable for head bolts.                ARP's grade 5 = 90k psi YS, grade 8= 120k psi & 150k psi ARP 8740 chrome moly= 180k YS, 170-190k UTS. Differences in ratings due to different quality sub grades of 8740. Then there are the 17-4 PH & XM 19 series for applications requiring high mechanical & corrosion resistant properties, widely used in the marine hardware industry. BillTC 4926Sent from my iPad On Nov 24, 2017, at 9:33 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:   Yep Roger, I stand corrected, although most sites offering SS fasteners list them according to their equivalency to Grade 3, 5, 8.8, 10.9 etc...  McMaster Carr who is arguably one of the most common hardware suppliers in the States offers SS hardware in 18-8  Hardness B74  Tensile 70,000psi,  316   Hardness B70   Tensile 70,000psi, Alloy 20  Hardness B80  Tensile 80,000psi, A286  hardness C24  Tensile 130,000psi, HS 17-4PH  Hardness C28  Tensile 130,000psi and 410  Hardness Grade 5 equiv

 The Grade 8 or better equivalent SS hardware typically is not in open stock but is specialty order to mainly the Chemical Industry where high corrosion resistance is required along with high strength.  

Ref: 

[b]SAE Grade 8[/b] bolt capability in yield (stretch) = 130,000 lbs / in2 , SAE Grade 8 bolt capability in tension (failure) = 150,000 lbs / in2, 

SAE Grade 5 bolt capability in yield (stretch) = 92,000 lbs / in2,  SAE Grade 5 bolt capability in tension (failure) = 120,000 lbs / in2 

Metric Class 8.8  tension 110,000psi ,  Metric Class 10.9  Tension = 150,000psi,  Metric class 12.9 Tension = 174,000psi

I wonder if there is a document available that gives the BSW/BSF head markings/strength identification by location on our cars and likewise the mad metric head markings by location on the mechanicals as well.  That would be interesting as a comparison tool.  

Bottom line availability says that for low to medium strength applications SS is a viable option at the owners discretion...All others better to be safe than sorry....

On Friday , November 24 , 2017 06 : 04 : 13 AM CST, Roger Furneaux roger.46tc@gmail.com> wrote: I don't think you will find stainless steel bolts in strength grades, only as A2 or A4, which refers to their corrosion resistance. SS is banned (don't know if it is actually enshrined in EU law) from being used in any safety related situations: apart from lack of ternsile strength it also suffers from work-hardening (maybe John Kallend can tell us more about this - are you there John?). On our cars, the only obvious places to use them are holding the running-boards, and in places where a chrome-plated brass screw was used originally (such as the dashboard). Polished SS looks as good as chrome and will never tarnish. FYI I keep good stocks of every bolt and stud used on our cars in zinc-plated HT steel  and  some SS.  oc[b]T[/b]agonally Roger On Fri, Nov 24, 2017 at 9:31 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: [u][/u]   Graham:  Norman has you pretty much spot on with his comments on this subject.  I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware.  There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5.  Grade 8 is available  but limited in availability and selections.  If I were you, I'd tend to follow Norm's advice.   Sent from Yahoo Mail on Android On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc]mg-tabc-noreply@yahoogroups.com> wrote:   Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners. easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham
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Usaj24@earthlink.net
Posts: 14
Joined: Fri Jun 17, 2016 3:11 pm

Fwd: [mg-tabc] Strength of stainless bolts

Post by Usaj24@earthlink.net » Fri Nov 24, 2017 8:36 am

Sent from my iPad Begin forwarded message:
[b]From:[/b] "Usaj24@earthlink.net" Usaj24@earthlink.net> [b]Date:[/b] November 24, 2017 at 11:04:54 AM EST [b]To:[/b] mg-tabc@yahoogroups.com [b]Subject:[/b] [b]Re: [mg-tabc] Strength of stainless bolts[/b]
Sent from my iPad On Nov 24, 2017, at 11:01 AM, "Usaj24@earthlink.net" Usaj24@earthlink.net> wrote: A-2 S/S is comparable  to domestic 302 & 304  in corrosion resistance. A-4 is comparable to type 316 for CR. For higher strength, fatigue resistant, durable & tougher S/S fasteners, do not overlook ARP's "Stainless 300", 140k psi YS & 170-190k psi UTS.Their Custom 450 S/S is rated at 150k psi & 170k psi UTS. Suitable for head bolts.                ARP's grade 5 = 90k psi YS, grade 8= 120k psi & 150k psi ARP 8740 chrome moly= 180k YS, 170-190k UTS. Differences in ratings due to different quality sub grades of 8740. Then there are the 17-4 PH & XM 19 series for applications requiring high mechanical & corrosion resistant properties, widely used in the marine hardware industry. BillTC 4926Sent from my iPad On Nov 24, 2017, at 9:33 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote:   Yep Roger, I stand corrected, although most sites offering SS fasteners list them according to their equivalency to Grade 3, 5, 8.8, 10.9 etc...  McMaster Carr who is arguably one of the most common hardware suppliers in the States offers SS hardware in 18-8  Hardness B74  Tensile 70,000psi,  316   Hardness B70   Tensile 70,000psi, Alloy 20  Hardness B80  Tensile 80,000psi, A286  hardness C24  Tensile 130,000psi, HS 17-4PH  Hardness C28  Tensile 130,000psi and 410  Hardness Grade 5 equiv

 The Grade 8 or better equivalent SS hardware typically is not in open stock but is specialty order to mainly the Chemical Industry where high corrosion resistance is required along with high strength.  

Ref: 

[b]SAE Grade 8[/b] bolt capability in yield (stretch) = 130,000 lbs / in2 , SAE Grade 8 bolt capability in tension (failure) = 150,000 lbs / in2, 

SAE Grade 5 bolt capability in yield (stretch) = 92,000 lbs / in2,  SAE Grade 5 bolt capability in tension (failure) = 120,000 lbs / in2 

Metric Class 8.8  tension 110,000psi ,  Metric Class 10.9  Tension = 150,000psi,  Metric class 12.9 Tension = 174,000psi

I wonder if there is a document available that gives the BSW/BSF head markings/strength identification by location on our cars and likewise the mad metric head markings by location on the mechanicals as well.  That would be interesting as a comparison tool.  

Bottom line availability says that for low to medium strength applications SS is a viable option at the owners discretion...All others better to be safe than sorry....

On Friday , November 24 , 2017 06 : 04 : 13 AM CST, Roger Furneaux roger.46tc@gmail.com> wrote: I don't think you will find stainless steel bolts in strength grades, only as A2 or A4, which refers to their corrosion resistance. SS is banned (don't know if it is actually enshrined in EU law) from being used in any safety related situations: apart from lack of ternsile strength it also suffers from work-hardening (maybe John Kallend can tell us more about this - are you there John?). On our cars, the only obvious places to use them are holding the running-boards, and in places where a chrome-plated brass screw was used originally (such as the dashboard). Polished SS looks as good as chrome and will never tarnish. FYI I keep good stocks of every bolt and stud used on our cars in zinc-plated HT steel  and  some SS.  oc[b]T[/b]agonally Roger On Fri, Nov 24, 2017 at 9:31 AM, 'M. P.' imabystander@yahoo.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: [u][/u]   Graham:  Norman has you pretty much spot on with his comments on this subject.  I would add that if your UK supplier does not state the type or grade of SS they are selling you thst the hardware is pretty much for holding panel in place or as decorative hardware.  There are different grades of SS in different strengths but no ally you won't find anything better than a grade 5.  Grade 8 is available  but limited in availability and selections.  If I were you, I'd tend to follow Norm's advice.   Sent from Yahoo Mail on Android On Fri, Nov 24, 2017 at 1:53 AM, Graham Knight graham.knight5@gmail.com [mg-tabc]mg-tabc-noreply@yahoogroups.com> wrote:   Hi, I occasionally make use of stainless steel bolts on my car - mostly bought from http://stigfasteners. easywebstore.co.uk/. I can find nothing on their site about precisely what grade of SS is used. Are SS bolts generally as strong as high-tensile steel? Graham
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