[Fot] ARP and other additions to the bolt material strength chart

fubog1 fubog1 at aol.com
Mon Jan 17 06:09:11 MST 2022


 Good thread & all good info here.A great source of more than you probably wanted to know about the subject is the late great Carrol Smiths book "Screw to Win" ("nuts, bolts, fasteners and plumbing" being the official title).For those who may not be familiar with his "To Win" series, they are an excellent resource...

Glen Efinger
 
 
-----Original Message-----
From: Enquiries Road & Track via Fot <fot at autox.team.net>
To: vfracing at aol.com
Cc: fot at autox.team.net <fot at autox.team.net>
Sent: Sun, Jan 16, 2022 5:09 pm
Subject: Re: [Fot] ARP and other additions to the bolt material strength chart

one should not forget, that  the torque applied to a bolt /nut is designed to stretch the fastner and that stretch plays a role in its ability not to loosen in service
Simplistically, the stronger and larger the fastener, the higher the torque needed. swapping fasteners without understanding this, and using öriginal"torque values, can end in disaster
also, the tension induced in any fastener is directly linked to the lubricant used and quality of the thread form. in many cases, original makers specified the lubricant (if any) that should be applied to their set torque valve. high 'strength" fasteners like ARP, often come with highly specialized lubricant and the induced tension is greatly altered if you change that.  that can be easily proven when measuring the stretch on a bolt for any given torque value
many modern makers are using fasteners in engines etc that are not finally "tightened" with a conventional torque wrench, but rather an angular value is used to ensure the fastener is stretched to the exact amount needed. 
in extremely sensitive applications (not usually a car) , bolts are directly stretched with hydraulic pullers and the nut then tightened to come predefined value


Terry

On Mon, Jan 17, 2022 at 4:10 AM Phil Gott via Fot <fot at autox.team.net> wrote:

Good point, Ken;
This chart was made so that  the used original fasteners can be replaced with new ones of equal or greater strength!
Regards
Phil


-----Original Message-----
From: kknight at klaenv.com
To: vfracing at aol.com
Sent: Sun, Jan 16, 2022 10:49 am
Subject: RE: [Fot] ARP and other additions to the bolt material strength chart

All great information to have, well done sir.    Everyone should remember that bolts are consumable items.  Any stressed bolt in a race engine or suspension has a life expectancy.  No one should be using ANY critical fastener in a race motor that is original.  A few dollars spent could save thousands!  If it is critical in your suspension your butt is on the line if it fails.  Better safe than sorry.  Good racing all.  Ken   From: Fot <fot-bounces at autox.team.net> On Behalf Of Phil Gott via Fot
Sent: Sunday, January 16, 2022 6:58 AM
To: fot at autox.team.net
Subject: [Fot] ARP and other additions to the bolt material strength chart  Amici:  Joe Boruch suggested that ARP bolt materials be added to the chart and Mike Harmuth suggested pdf format, so here they are!  Also added is the sometimes used British nomenclature of noting the tensile strength range, measured in tons per square inch, instead of a letter designation.  Remember, tensile strength is not the only consideration.  Ductility and fatigue life are also critical, as are thread formation and location.  For example, note that wheel studs, critically loaded components, are not made of the strongest material.  SAE wheel studs have a tensile strength similar to a grade 5 bolt but have a special composition all their own to withstand millions of reverse loading cycles without fatigue.  Enjoy!  Phil Gott  
| Bolt Grade | Minimum Tensile Strength (000 psi) |  |
|  |  |
| AN*** | SAE* | British** | ARP**** | Metric* | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 | 160 | 170 | 180 | 190 | 200 | 210 | 220 | 230 | 240 | 250 | 260 | 270 | 280 | 290 | 300 | 310 |  |  |
|   | 2 > 3/4" |   |   |   |   | 60 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   | 2 to 3/4" |   |   |   |   |   | 74 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | P |   |   |   |   | 70-90 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | Q |   |   |   |   |   | 80-100 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | R or "45-55" |   |   |   |   |   |   | 90-110 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | S |   |   |   |   |   |   |   | 100-120 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | T  |   |   |   |   |   |   |   |   | 110-130 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   |   | 8.8 to 16mm |   |   |   |   |   |   | 116 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   |   | 8.8 > 16mm |   |   |   |   |   |   |   | 120 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   | 5 |   |   |   |   |   |   |   |   |   |   | 120 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
| All |   |   |   |   |   |   |   |   |   |   |   | 125 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | U |   |   |   |   |   |   |   |   |   | 120-140 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | V |   |   |   |   |   |   |   |   |   |   | 130-150 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | W |   |   |   |   |   |   |   |   |   |   |   | 140-160 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   | 8 |   |   |   |   |   |   |   |   |   |   |   |   |   | 150 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   |   | 10.9 |   |   |   |   |   |   |   |   |   |   | 151 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | X |   |   |   |   |   |   |   |   |   |   |   |   | 150-170 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   | Y |   |   |   |   |   |   |   |   |   |   |   |   |   | 160-180 |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   |   | 12.9 |   |   |   |   |   |   |   |   |   |   |   |   | 177 |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   | Titanium |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 180 |   |   |   |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   | 8740 |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 180-210 |   |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   | ARP 2000 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 220 |   |   |   |   |   |   |   |   |   |  |  |
|   |   |   | L19 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 260 |   |   |   |   |   |  |  |
|   |   |   | 625 Plus |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 260-280 |   |   |   |  |  |
|   |   |   | ARP 325 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 260-280 |   |   |   |  |  |
|   |   |   | Aermet |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 290-310 |  |  |
| Sources:  *Bolt Depot Inc. and **Trojansf.co.uk/technical/fastener-grades and ***Skyshop and ****ARP web page.  ARP bolt grades are registered trademarks of ARP or CRS Holdings Inc. |  |  |
|  |  |

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