Rear leaf spring forward link bolt

AA Ford Discussion Group relating to the repair and restoration of your AA Ford.
JPP
Posts: 161
Joined: July 8th, 2011, 4:36 am
Body Type: 82-A
Model Year: 1929
Location: Townsend,MA

Rear leaf spring forward link bolt

Post by JPP » December 22nd, 2014, 11:36 am

I am trying to determine the pitch of the forward shackle 3/4 nut. This is the lower bolt as the top bolt does not have a nut. And yes this is not the center pivot bolt, as I believe that is much bigger. So I tried a 3/4 16, not sure if this is the one, snug to start. Help.

Bob C
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Joined: April 24th, 2003, 11:50 am
Body Type: Mail truck, Stake tr
Model Year: 1931
Location: SO CAL

Re: Rear leaf spring forward link bolt

Post by Bob C » December 22nd, 2014, 4:41 pm

I measured one and can up with 16 TPI also.

Bob

ModelAkid
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Re: Rear leaf spring forward link bolt

Post by ModelAkid » December 22nd, 2014, 5:33 pm

If the threads are rusty you will need to clean them up with a thread die. I have to clean up threads with taps & dies all the time when I am working on old cars & trucks.

Stakebed
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Model Year: 1929
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Re: Rear leaf spring forward link bolt

Post by Stakebed » December 22nd, 2014, 5:48 pm

or like one of mine was cross threaded... :shock:

ModelAkid
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Re: Rear leaf spring forward link bolt

Post by ModelAkid » December 22nd, 2014, 6:41 pm

"or like one of mine was cross threaded..."

I hate when that happens! In that case a thread die is the only chance to restore the threads.

JPP
Posts: 161
Joined: July 8th, 2011, 4:36 am
Body Type: 82-A
Model Year: 1929
Location: Townsend,MA

Re: Rear leaf spring forward link bolt

Post by JPP » December 23rd, 2014, 3:49 am

Thanks for all the help.

spdway1

Re: Rear leaf spring forward link bolt

Post by spdway1 » December 23rd, 2014, 1:48 pm

Snyders sells the bolt and nut.

JPP
Posts: 161
Joined: July 8th, 2011, 4:36 am
Body Type: 82-A
Model Year: 1929
Location: Townsend,MA

Re: Rear leaf spring forward link bolt

Post by JPP » December 23rd, 2014, 5:41 pm

Thanks for the insight, but a $1.80 nut will due for my needs.

Stakebed
Posts: 1187
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Body Type: Grainbox
Model Year: 1929
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Re: Rear leaf spring forward link bolt

Post by Stakebed » December 23rd, 2014, 7:44 pm

speaking of these bolts - how much wear is too much wear? $40 a pop is quite hefty if I can get by...

Does anyone have any dimensions of these bolts?

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Neil Wilson
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AA Rear Spring Shackle Bolts

Post by Neil Wilson » December 23rd, 2014, 8:13 pm

FYI

There were two styles of shackle bolts used for the AA rear springs. Attached are pictures. The square headed bolt was used starting April 1928 through May 1929. Otherwise, the hex. head bolt was used.
  • AA's without emergency brakes used three bolts per side (upper and lower shackle bolts and rear upper seat bolt).
    AA's with emergency brakes used two bolts per side (upper and lower shackle bolts).
The upper shackle bolt used AA-5782 Lock to prevent the bolt from turning. Otherwise, bolts uses a 3/4-16 (9/16 x 1-1/2) castle nut. The nuts were tightened to a sung fit and then backed of for the cotter to fit (they were not tightened).
Attachments
A-21320 Bolt 2c2.jpg
A-21320 Bolt 2c2.jpg (101.83 KiB) Viewed 5218 times
A-21320 Bolt 1c2.jpg
A-21320 Bolt 1c2.jpg (123.08 KiB) Viewed 5218 times
Regards, Neil Wilson
______________________________________
neil@aafords.com - use this email for contact
https://aafords.com/ - Ford Model AA Truck Club @ aafords.com

Stakebed
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Location: Illinois

Re: Rear leaf spring forward link bolt

Post by Stakebed » December 24th, 2014, 5:04 am

I've got several bolts that the threads are great and head is great but the shoulder is worn.

Would it be possible to lathe down the shoulder portion and slip a 1" OD bushing over it and JB weld or somehow secure the bushing from rotating?

1" bushings are much cheaper than $40 for a new bolt (i would need all 4...)

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spectria
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Location: Quincy, Ca.

Re: Rear leaf spring forward link bolt

Post by spectria » December 24th, 2014, 11:44 am

The shear strength would not be lessened by reducing the diameter to fit a bushing as long as it remained larger than the threaded portion.. Just freeze the bolt and heat the bushing with a .003" interference and there will be no rotating going on...
I'd rather have a used/new correct bolt...
Dave in Quincy, Ca. I love Pics!!!! Post them All!!! :)
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Drew Mashburn
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Re: Rear leaf spring forward link bolt

Post by Drew Mashburn » December 24th, 2014, 1:55 pm

Stakebed:

If you're not planning on carrying a lot of weight, I imagine your method would work perfectly well. And, should it not work out, well......great topic for further discussion.

Go for it!
-- Drew
Drew Mashburn

Stakebed
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Re: Rear leaf spring forward link bolt

Post by Stakebed » December 24th, 2014, 9:27 pm

Yea i may put 1000lbs max on the bed.

ill see how much i can get bushings for.

heres what i can come up with

http://www.grainger.com/product/BUNTING ... 1?$smthumb$

id pay less than $40 for the package of 3 with my discount.

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spectria
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Body Type: Mail Truck, Stakebed
Model Year: 1931
Location: Quincy, Ca.

Re: Rear leaf spring forward link bolt

Post by spectria » December 24th, 2014, 11:06 pm

I think you need a one piece hard steel sleeve. If you have access to a lathe, you can make them.
Dave in Quincy, Ca. I love Pics!!!! Post them All!!! :)
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