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Bolts with no slashes are grade two. The grade of the bolt is indicated by=
the number of slashes plus two. I do not recommend grade two for suspensi=
on duty. =20
I've heard said that the trade-off with Grade 8 bolts is that they are stro=
nger but more brittle. Since I am not a mechanical engineer I cannot make =
a recommendation on substituting a grade 8 for a grade 5 but I would be con=
cerned that the increased brittle nature may be a detriment. Considering th=
e seriousness of the consequences of a suspension failure I would think aga=
in about making substitutions. And just about anything you need is availab=
le next business day from McMaster Carr (and other sources, certainly). Bu=
t you may have to buy more than you need and pay shipping.
I don't think fine thread vs coarse thread makes much difference.
Just my opinion.
=20
Dave Massey
=20
=20
-----Original Message-----
From: Bud R <levilevi@comcast.net>
To: Triumph Mail List <triumphs@autox.team.net>
Sent: Thu, Nov 24, 2016 12:38 pm
Subject: [TR] Threads and Bolts
Listerati,
I=E2=80=99m working on the Spitfire=E2=80=99s traverse leaf swing spring re=
ar suspension and can=E2=80=99t find locally the 7/16=E2=80=9D fine thread=
(20 tpi) by 3 1/2=E2=80=9D bolts that were holding the vertical link and t=
o the trunnions and to the swing spring bushings.
I can find the right sizes in a coarse thread (12 tpi) grade 8 bolt and tha=
ts my plan. The old ones are grade 5 or in one case a bolt with no slash ma=
rks on top. I don=E2=80=99t know what it is.
=20
Do these bolts need to be fine thread for any particular reason, e.g. for s=
afety, torque specs, etc.? Is a grade 8 bolt a good idea where it will be s=
tressed with all the up and down motion with the vertical link? Too brittle=
? Usually I go for grade 8 whenever possible but I=E2=80=99ve heard there a=
re instances where it might not be the best solution.
An aside for Thanksgiving:=20
My son and his wife teaching in Shanghai said the Chinese love to celebrate=
American holidays (they know them from American TV and movies) but their t=
ake on Thanksgiving is that you thank people who do nice things for you. So=
they got cards from their students thanking them for teaching. Kind of a d=
ifferent twist but a good one I thought.
Happy Thanksgiving to all.
Bud Rolofson
Extreme Parts Racing (more than just a haircut)
71TR6 CC57365 (Good 6)
71 Spitfire MK IV Race Car #3
69 Spitfire MK 3 (back up FE engine/dinghy car)
93 Minnie Winnie Race Support Vehicle=20
77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
** triumphs@autox.team.net **
Archive: http://www.team.net/archive
sey@cs.com
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<font color=3D'black' size=3D'4' face=3D'Arial, Helvetica, sans-serif'><fon=
t size=3D"4">Bolts with no slashes are grade two. The grade of the bo=
lt is indicated by the number of slashes plus two. I do not recommend=
grade two for suspension duty. <br>
<br>
I've heard said that the trade-off with Grade 8 bolts is that they are stro=
nger but more brittle. Since I am not a mechanical engineer I cannot =
make a recommendation on substituting a grade 8 for a grade 5 but I would b=
e concerned that the increased brittle nature may be a detriment. Consideri=
ng the seriousness of the consequences of a suspension failure I would thin=
k again about making substitutions. And just about anything you need =
is available next business day from McMaster Carr (and other sources, certa=
inly). But you may have to buy more than you need and pay shipping.</=
font><br>
<br>
<font size=3D"4">I don't think fine thread vs coarse thread makes much diff=
erence.<br>
<br>
Just my opinion.<br>
</font>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave Massey</font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Bud R <levilevi@comcast.net><br>
To: Triumph Mail List <triumphs@autox.team.net><br>
Sent: Thu, Nov 24, 2016 12:38 pm<br>
Subject: [TR] Threads and Bolts<br>
<br>
<div id=3D"AOLMsgPart_1.2_e9fc94a6-abdd-40f8-a252-0451dcf2ea86">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;" class=3D"aolReplacedBody">
<div>Listerati,</div>
<div><br>
</div>
I=E2=80=99m working on the Spitfire=E2=80=99s traverse leaf swing spring re=
ar suspension and can=E2=80=99t find locally the 7/16=E2=80=9D fine t=
hread (20 tpi) by 3 1/2=E2=80=9D bolts that were holding the vertical link =
and to the trunnions and to the swing spring bushings.
<div><br>
</div>
<div>I can find the right sizes in a coarse thread (12 tpi) grade 8 bolt an=
d thats my plan. The old ones are grade 5 or in one case a bolt with no sla=
sh marks on top. I don=E2=80=99t know what it is.<br>
<div>
<div>Do these bolts need to be fine thread for any particular reason, e.g. =
for safety, torque specs, etc.? Is a grade 8 bolt a good idea where it will=
be stressed with all the up and down motion with the vertical link? Too br=
ittle? Usually I go for grade 8 whenever possible but I=E2=80=99ve heard th=
ere are instances where it might not be the best solution.</div>
<div><br>
</div>
<div>An aside for Thanksgiving: </div>
<div>My son and his wife teaching in Shanghai said the Chinese love to cele=
brate American holidays (they know them from American TV and movies) but th=
eir take on Thanksgiving is that you thank people who do nice things for yo=
u. So they got cards from their students thanking them for teaching. Kind o=
f a different twist but a good one I thought.</div>
<div><br>
</div>
<div>Happy Thanksgiving to all.</div>
</div>
</div>
<div><br>
</div>
<div>
<span class=3D"Apple-style-span" style=3D"border-collapse: separate; border=
-spacing: 0px;">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;"><span class=3D"Apple-style-span" style=3D"orpha=
ns: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-=
decorations-in-effect: none;">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;"><span class=3D"Apple-style-span" style=3D"orpha=
ns: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-=
decorations-in-effect: none;">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;"><span class=3D"Apple-style-span" style=3D"orpha=
ns: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-=
decorations-in-effect: none;">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;"><span class=3D"Apple-style-span" style=3D"orpha=
ns: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-=
decorations-in-effect: none;">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;"><span class=3D"Apple-style-span" style=3D"orpha=
ns: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-=
decorations-in-effect: none;">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;"><span class=3D"Apple-style-span" style=3D"orpha=
ns: 2; text-indent: 0px; widows: 2; -webkit-text-decorations-in-effect: non=
e;">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;"><span class=3D"Apple-style-span" style=3D"orpha=
ns: 2; text-indent: 0px; widows: 2; -webkit-text-decorations-in-effect: non=
e;">
<div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;"><br class=3D"Apple-interchange-newline">Bud Rolofson</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;"><br>
</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;">Extreme Parts Racing (more than just a haircut)</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;"><br>
</div>
<div>71TR6 CC57365 (Good 6)</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;">71 Spitfire MK IV Race Car #3</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;">69 Spitfire MK 3 (back up FE engine/dinghy car)</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;">93 Minnie Winnie Race Support Vehicle </div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-style: normal; font-variant: normal; font-weight: normal; l=
etter-spacing: normal; line-height: normal; text-transform: none; white-spa=
ce: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-wid=
th: 0px;">77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)=
</div>
</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-=
weight: normal; letter-spacing: normal; line-height: normal; text-transform=
: none; white-space: normal; word-spacing: 0px; border-spacing: 0px; -webki=
t-text-stroke-width: 0px;"><br>
</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-=
weight: normal; letter-spacing: normal; line-height: normal; text-transform=
: none; white-space: normal; word-spacing: 0px; border-spacing: 0px; -webki=
t-text-stroke-width: 0px;"><br>
</div>
</span><br class=3D"Apple-interchange-newline"></div>
</span><br class=3D"Apple-interchange-newline"></div>
</span><br class=3D"Apple-interchange-newline"></div>
</span><br class=3D"Apple-interchange-newline"></div>
</span><br class=3D"Apple-interchange-newline"></div>
</span><br class=3D"Apple-interchange-newline"></div>
</span><br class=3D"Apple-interchange-newline"></div>
</span><br class=3D"Apple-interchange-newline" style=3D"color: rgb(0, 0, 0)=
; font-family: Helvetica; font-size: 18px; font-style: normal; font-variant=
: normal; font-weight: normal; letter-spacing: normal; line-height: normal;=
orphans: auto; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-w=
idth: 0px;"><br class=3D"Apple-interchange-newline">
</div>
<br>
</div>
</div>
<br>
** <a href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.net</a> *=
*<br>
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ons/triumphs/dave1massey@cs.com</a><br>
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</font>
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