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

Sun Jan 16 15:09:16 MST 2022

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*
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> *80*
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> *90*
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> *100*
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> *110*
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> *120*
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> *130*
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> *140*
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> *150*
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> *160*
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> *170*
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> *180*
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> *190*
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> *200*
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> *210*
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> *220*
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> *230*
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> *240*
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> *250*
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> *260*
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> *270*
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> *280*
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> *290*
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> *300*
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> *310*
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>
> 2 > 3/4"
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> 60
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> 2 to 3/4"
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> 74
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> P
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> 70-90
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> 80-100
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> R or "45-55"
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> 90-110
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> S
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> 100-120
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> T
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> 110-130
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> 8.8 to 16mm
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> 116
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> 8.8 > 16mm
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> 120
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> 120
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> 125
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> U
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> 120-140
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> 130-150
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> 140-160
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> 10.9
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> 151
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> 150-170
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> 160-180
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> 12.9
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> 180
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> 8740
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> 180-210
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> ARP 2000
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> 220
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> L19
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> 260
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> 625 Plus
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> 260-280
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> ARP 325
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> 260-280
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> Aermet
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> 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.
>
>
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
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>
>
>
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