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Willys M Jeeps Forums :: View topic - Bolts for campanion flange at parking brake
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Bolts for campanion flange at parking brake

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Joined: Sep 28, 2008
Posts: 275
Location: Caldwell, Texas

PostPosted: Sat Jul 04, 2020 1:10 pm    Post subject: Bolts for campanion flange at parking brake Reply with quote

When re-installing my parking brake drum and companion flange for the drive shaft I noticed that the 4 bolts that hold the brake drum, companion flange and u-joint were not in very good shape. The bolt is supposed to be 3/8 X 1 3/8 NF. The shank on the both is about 7/8 and the treads about 1/2 inches.
The only grade 8 bolts I have found locally are 3/8 x 1 1/2 but have no shank, they are threaded from the bolt head to the end.

I think that the extra 1/8 inch in length is probably not a problem but I don't know if it is important that the bolt have the un-threaded shank or not.

Does the shank or lack there of make a difference?
R G Mutchler
M-38 MC13312
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Joined: Oct 02, 2014
Posts: 770
Location: South Carolina, Dorchester County

PostPosted: Mon Jul 06, 2020 7:25 pm    Post subject: Reply with quote

Hi Ralph,
I think the shank is there for a reason. As I'm a rookie --- don't ask me why (that's a Wes question). I didn't look up your bolts in the ORD9, but suspect maybe they're also fine thread?

I've had better luck finding fine threaded bolts with shanks than those with coarse thread.

A quick search didn't turn up exactly what you're looking for, but here's some stainless steel with shanks not as long as you need:

or these:

I believe I've seen what you need before. I'll keep looking.

Good luck!
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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Joined: Apr 04, 2005
Posts: 14979
Location: Wisconsin

PostPosted: Tue Jul 07, 2020 12:08 am    Post subject: Reply with quote

Bolts used particularly in shear applications normally have a smooth close tolerance shank to take that kind of loading. Find the correct bolts.

Do Not Use Stainless substitutes they are considerably weaker and softer then standard cadmium plated steel bolts.

7373177, 5305-00-737-3177 WO# A6084, SP# 6-73-122, Bolt, hex-hd steel, 3/8-24NF-3 x 1 3/8. (3/8 bolt dia, 24 threads per inch, National Fine Threads, Class 3 bolt, 1 3/8" long.)

The only number that offered any help was the Spicer/Dana # 6-73-122 yielded a page with a Spicer/Dana parts catalog dated 2004. You should download a PDF copy!

The only other direction I could steer you is to an AN6- bolt with the same length shank as the spicer bolt. Just measure that smmoth shank which is also often referred to as grip length and compare it to an AN6- Catalog for the closest matching grip length. Keep in mind that your grip length should never be greater than the combined thickness of the joined materials!

A larger & more readable file is here:
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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