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Hi, I recommend you use whatever Triumph used as far as grades and pitches i=
f it is suspension or safety related. As far as pitch, fine pitch is a bit s=
tronger and more resistant to loosening, but more likely to cross thread and=
corrosion affects it more due to the shallower grooves.
Take care
> On Nov 24, 2016, at 1:51 PM, Dave <dave1massey@cs.com> wrote:
>=20
> Bolts with no slashes are grade two. The grade of the bolt is indicated b=
y the number of slashes plus two. I do not recommend grade two for suspensi=
on duty. =20
>=20
> I've heard said that the trade-off with Grade 8 bolts is that they are str=
onger 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 conce=
rned that the increased brittle nature may be a detriment. Considering the s=
eriousness of the consequences of a suspension failure I would think again a=
bout making substitutions. And just about anything you need is available ne=
xt business day from McMaster Carr (and other sources, certainly). But you m=
ay have to buy more than you need and pay shipping.
>=20
> I don't think fine thread vs coarse thread makes much difference.
>=20
> Just my opinion.
>=20
> Dave Massey
>=20
>=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
>=20
> Listerati,
>=20
> I=E2=80=99m working on the Spitfire=E2=80=99s traverse leaf swing spring r=
ear 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 to=
the trunnions and to the swing spring bushings.
>=20
> I can find the right sizes in a coarse thread (12 tpi) grade 8 bolt and th=
ats 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 st=
ressed with all the up and down motion with the vertical link? Too brittle? U=
sually I go for grade 8 whenever possible but I=E2=80=99ve heard there are i=
nstances where it might not be the best solution.
>=20
> An aside for Thanksgiving:=20
> My son and his wife teaching in Shanghai said the Chinese love to celebrat=
e 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 t=
hey got cards from their students thanking them for teaching. Kind of a diff=
erent twist but a good one I thought.
>=20
> Happy Thanksgiving to all.
>=20
>=20
> Bud Rolofson
>=20
> Extreme Parts Racing (more than just a haircut)
>=20
> 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)
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
>=20
> ** triumphs@autox.team.net **
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/dave1ma=
ssey@cs.com
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>Hi, I recommend you use whatever Trium=
ph used as far as grades and pitches if it is suspension or safety related. A=
s far as pitch, fine pitch is a bit stronger and more resistant to loosening=
, but more likely to cross thread and corrosion affects it more due to the s=
hallower grooves.<br><br>Take care<div><br></div></div><div><br>On Nov 24, 2=
016, at 1:51 PM, Dave <<a href=3D"mailto:dave1massey@cs.com";>dave1massey@=
cs.com</a>> wrote:<br><br></div><blockquote type=3D"cite"><div><font colo=
r=3D"black" size=3D"4" face=3D"Arial, Helvetica, sans-serif"><font size=3D"4=
">Bolts with no slashes are grade two. The grade of the bolt is indica=
ted by the number of slashes plus two. I do not recommend grade two fo=
r suspension duty. <br>
<br>
I've heard said that the trade-off with Grade 8 bolts is that they are stron=
ger but more brittle. Since I am not a mechanical engineer I cannot ma=
ke a recommendation on substituting a grade 8 for a grade 5 but I would be c=
oncerned that the increased brittle nature may be a detriment. Considering t=
he seriousness of the consequences of a suspension failure I would think aga=
in about making substitutions. And just about anything you need is ava=
ilable next business day from McMaster Carr (and other sources, certainly).&=
nbsp; 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 diffe=
rence.<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">-----O=
riginal Message-----<br>
From: Bud R <<a href=3D"mailto:levilevi@comcast.net";>levilevi@comcast.net=
</a>><br>
To: Triumph Mail List <<a href=3D"mailto:triumphs@autox.team.net";>triumph=
s@autox.team.net</a>><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 rea=
r suspension and can=E2=80=99t find locally the 7/16=E2=80=9D fine thr=
ead (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 and=
thats my plan. The old ones are grade 5 or in one case a bolt with no slash=
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. f=
or safety, torque specs, etc.? Is a grade 8 bolt a good idea where it will b=
e stressed with all the up and down motion with the vertical link? Too britt=
le? 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.</div>
<div><br>
</div>
<div>An aside for Thanksgiving: </div>
<div>My son and his wife teaching in Shanghai said the Chinese love to celeb=
rate American holidays (they know them from American TV and movies) but thei=
r take on Thanksgiving is that you thank people who do nice things for you. S=
o they got cards from their students thanking them for teaching. Kind of a d=
ifferent 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"orphans=
: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-dec=
orations-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"orphans=
: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-dec=
orations-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"orphans=
: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-dec=
orations-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"orphans=
: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-dec=
orations-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"orphans=
: 2; text-align: -webkit-auto; text-indent: 0px; widows: 2; -webkit-text-dec=
orations-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"orphans=
: 2; 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"orphans=
: 2; text-indent: 0px; widows: 2; -webkit-text-decorations-in-effect: none;"=
>
<div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;"><br class=3D"Apple-interchange-newline">Bud Rolofson</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;"><br>
</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;">Extreme Parts Racing (more than just a haircut)</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;"><br>
</div>
<div>71TR6 CC57365 (Good 6)</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;">71 Spitfire MK IV Race Car #3</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;">69 Spitfire MK 3 (back up FE engine/dinghy car)</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;">93 Minnie Winnie Race Support Vehicle </div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-style: normal; font-variant: normal; font-weight: normal; let=
ter-spacing: normal; line-height: normal; text-transform: none; white-space:=
normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-stroke-width: 0=
px;">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: H=
elvetica; font-size: 12px; font-style: normal; font-variant: normal; font-we=
ight: normal; letter-spacing: normal; line-height: normal; text-transform: n=
one; white-space: normal; word-spacing: 0px; border-spacing: 0px; -webkit-te=
xt-stroke-width: 0px;"><br>
</div>
<div style=3D"border-collapse: separate; color: rgb(0, 0, 0); font-family: H=
elvetica; font-size: 12px; font-style: normal; font-variant: normal; font-we=
ight: normal; letter-spacing: normal; line-height: normal; text-transform: n=
one; white-space: normal; word-spacing: 0px; border-spacing: 0px; -webkit-te=
xt-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: n=
ormal; font-weight: normal; letter-spacing: normal; line-height: normal; orp=
hans: auto; text-align: start; text-indent: 0px; text-transform: none; white=
-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0=
px;"><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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/www.team.net/donate.html</a><br>
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s/triumphs/dave1massey@cs.com</a><br>
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</font></div></blockquote></body></html>=
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