Bolt head marking research-the story so far in a spreadsheet

[Ralph]

Thanks to all for the info and pictures.
Mark,I noticed your picture of the unmarked dowel bolts-as are mine-it is nice to get questions answered directly...
Your system seems to have worked well for you and I have used the bag n tag also.Even when a bolt is unusable-I bag it for a direct replacement reference-saves a lookup in the manuals...
Chuck, I've seen the Ford recessed flanged bolts.Maybe Mark can help us on the MB style at the transmission tub plate.
Here is the odd mark on the tierod end clamps which (appear)original,though I cannot be sure...on my MB

Here is a shot of an E C frame to steering gear bolt/washer/nut set.The bolt head is not shown,I took the pic to show the original flat washer and the HD 'shakeproof' lockwasher.Only one set survived...

[Mark Tombleson]

Those front axles came as an assembly (as purchased) and those were the four bolts they came with for the MB.



Chuck, I have bolts like that (with the S) on my generator between the seats that came from Auto-Lite.




Same generator as above used three C over TR bolts on it's mount.


The master cylinder cover plate had modern bolts so I used CAT bolts and ground the head.


Same thing with the steering wheel support... ground CAT bolts.


The generator mount had a marking on one bolt, but I could not tell what it said.


No markings on the original bolts for the pedal shaft clamps.

[Ralph]

Mark thanks for the tierod clamp bolt pic.Another question answered.
....brake pedals and steering column support all E C here,but determining what is 'correct' may never be possible....I will get some Cat bolts also...I can see why your radio associated cover bolts would have come from Autolite...
My MB shows signs of once having some sort of radio but no PTO rig.Sure do thank you for all the pics.

[sutts]

Yes, thanks Mark for all those great pics. You must have had some real headaches restoring such a rare example.

Here are some pics of the bolts that appear original on my Feb 43 MB. Others to follow.

All air cleaner bracket bolts CTR:


Hood bond strap bolts CTR:


Horn bracket to firewall CTR:


Fan CTR:


Hood catches micture of CTR and EC:


Steering sector housing AA:


Headlight hinges to grill EC:



And a couple more from the great collection that Ian posted:






Cheers.

Dave

[Ralph]

Dave
Some of your bolts have survived in nice shape.I see you have a couple original rubber grommets too..and is that a surviving windshield wingbolt retainer chain?Good pics,thanks

[sutts]

Dave
Some of your bolts have survived in nice shape.I see you have a couple original rubber grommets too..and is that a surviving windshield wingbolt retainer chain?Good pics,thanks

Thanks Ralph, yes, I was lucky with those - EC marked for the hinges:


Side and corner handles EC too:

[sutts]

Hi Mark,

The 3 bolts (each side) that hold the tranny cross member to the frame shown in your picture:



Can you confirm please that those were unmarked?

Thanks

[Beers]

My Feb '43 has much of the same as Sutts (which makes sense) and a couple of slight variations from Mark's later MZ-1.

I'll have to grab some photos, but just looking at what appears to be untouched/original -

Bumperettes - A

Foot Rests - EC
Headlight Bracket to Grill - EC

Fuel Filter bracket to firewall - AA
Transfer Case oil pan - AA

Master Cylinder access cover - C/TR
Horn Bracket to firewall - C/TR
Air Filter bracket to firewall - C/TR
Axle Bumper brackets (front and rear) - C/TR

Have mostly EC bolts on the Side Handles, which appears consistent with the others, but have one "F" marked that snuck in!

[Beers]

Has anyone found a manufacturer to correspond with a bolt head...BC, EC, TR, A, AA or other?

I think the TR bolts were made by the Towne-Robinson Fastener Company, which went out of business in the early '90s.

http://globalfastenernews.com/main.asp? ... cleID=9161

Here's an interesting U.S. Dept. of Defense Handbook on fastener/bolt markings. Towne-Robinson is referenced on page 191.

http://www.efcog.org/wg/ism_qa_scqtt/do ... 20List.pdf

Paul

[Mark Tombleson]

Yes, no markings on all six. They are original as far as I can tell... I first worked on the tranny in 1982 and remember they were a bear to get off.




I had several original C over TR on the tranny cover.


And one that was just marked C.


EC on all three grab handles.


The bolts on the front and back differential covers are A.


I had to check and see if EC was also on the rear brake fitting.


I do have a few that seemed correct but were marked R over C, CX and one with a K that also looked correct, but didn't want to reinstall them as they didn't seem to fit in the group. I do have some that are very odd and don't seem to fit in the program, though they are not modern bolts.

[sutts]

More great info, thanks guys, I'm in bolt heaven.

Great to hear from you Beers, I'd forgotten just how close our vehicles are in numbers. I was assuming the fuel filter would be CTR like the other firewall attachments so it was very good to see your posting - never assume!

Thanks for the extra pics Mark and the confirmation on the cross member - I only have 2 bolts remaining and they are badly rusted and unreadable.

Cheers,

Dave

[Beers]

One more -

Parking brake cable bracket to firewall - C/TR

Dave, I'm a bit on the fence on the fuel filter bracket - like you said, everything else attached to the firewall seems to be C/TR. The use of the AA bolts seem more chassis/drivetrain related. I've never taken the filter bracket off (just the bowl), so maybe when I remove it I'll have a better idea if it appears to have ever been removed and if someone just happened to use two AA bolts to put it back on.

Great topic BTW! With only one factory used by Willys, it seems like we could put together fairly consistent guidelines on what bolts/markings went where based on timeframe.

Paul

[sutts]

Thanks Beers. Mark has A bolts on his fuel filter and you have AA. Unfortunately mine aren't original.

Someone suggested that the A and AA markings were an indication of strength, rather than a manufacturer.
That theory kind of makes sense since the frame, transmission, transfer case and engine all demand high grade bolts while things like the handles and panels can get away with cheaper grades.
We've also seen key fender to frame and bumperette bolts marked A. The CTR on the pintle hook blows that theory slightly though!

I would like to see what we're getting on original MB engine oil sumps - recessed like Ford? Ian's picture of the museum MB that I posted earlier shows recessed heads on the oil pan but I think I see grey on the engine so perhaps it's a replacement GPW block?

Cheers,

Dave

[Michael O.]

I recently begun disassembly of my fairly complete '44 MB and most of the bolts follow the same pattern of others who have posted here. There are a few I wish to add. I apologize that I don't have photos ready to post at this time.

Of the three long bolts that mounts the steering gear box to the frame, the longest one is a C/TR and the other two are EC.

The bolts on the rear seat retaining brackets (the little L shaped brackets) are C/TR.

I will post more when I get a chance to get out to the garage tomorrow.

[Ralph]

Michael,
Thanks for adding...on that longest frame to steering gear,a question-or four...
1. Is there a TRS present?
2. Is the thread the same as the other two E C bolts ( 7/16-20 NF ) ?
3. Is the bolt head the same (wrench size) as the other two E C bolts? (5/8) ?
4. Is there a washer under its head?
Thanks