[Fot] Bolts and Threads

[Steve Yott]

Bud,

McMaster Carr has everything you need and they have really fast shipping.
There would be nothing wrong with using grade 8 bolts in this application.  

 

Steve Yott

 

www.mcmaster.com <http://www.mcmaster.com>  

 

From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Bud R
Sent: Thursday, November 24, 2016 10:17 AM
To: fot <fot at autox.team.net>
Subject: Re: [Fot] Bolts and Threads

 

Oops the coarse thread is 14 tpi not 12.


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 

77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)

 

 

 

 

 

 

 

 

 

 

 

On Nov 24, 2016, at 9:03 AM, Bud R <levilevi at comcast.net
<mailto:levilevi at comcast.net> > wrote:





The Collective,

 

I'm working on the Spitfire's traverse leaf swing spring rear suspension and
can't find locally the 7/16"  fine thread (20 tpi) by 3 1/2" bolts that were
holding the vertical link and to the trunnions and to the swing spring
bushings.

 

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't know what it is.

 

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
brittle? Usually I go for grade 8 whenever possible but I've heard there are
instances where it might not be the best solution.

 

An aside for Thanksgiving: 

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
take 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
different twist but a good one I thought.

 

Happy Thanksgiving to all.

 

Thanks,
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 

77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)

 

 

 

 

 

 

 

 

 

 

 

 

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