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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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 Posted: Wed Dec 04, 2019 11:19 am Post subject: 18 headstuds-how to tell them apart? |
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I’m installing my head studs in the case and I have all these studs but would like to use the same ones for stretch. Is there any way to tell them apart?
Cro-mo? Steel? Factory? Etc?
I remember reading that the factory ones had a taper on the ends? is this correct?
I don’t wanna mix a cro-mo with a factory one by accident. That would present a problem!!
(Type 1 AE case with 10mm studs) |
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Brian_e
Samba Member
Joined: July 28, 2009
Posts: 3284
Location: Rapid City, SD
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| Posted: Wed Dec 04, 2019 11:26 am Post subject: Re: 18 headstuds-how to tell them apart? |
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New ones are black oxide coated, and OG ones are usually rusty. 
I can check when I get home tonight.
Brian
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www.type-emotorsports.com |
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Wed Dec 04, 2019 11:29 am Post subject: Re: 18 headstuds-how to tell them apart? |
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| Brian_e wrote: |
New ones are black oxide coated, and OG ones are usually rusty.
I can check when I get home tonight.
Brian |
I’m pretty sure I read the stockers were tapered on the ends but can’t find the thread now😡 These have all been run over the wire wheel and sitting in a bag of oil for the past year so it’s hard to tell from the looks of them.
Thank you |
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jpaull
Samba Member
Joined: February 22, 2005
Posts: 3462
Location: Paradise, Ca
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Wed Dec 04, 2019 12:25 pm Post subject: Re: 18 headstuds-how to tell them apart? |
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Really? Why?
I would think the cromoly ones don’t have the proper stretch that an oe one would. |
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jpaull
Samba Member
Joined: February 22, 2005
Posts: 3462
Location: Paradise, Ca
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| Posted: Wed Dec 04, 2019 1:09 pm Post subject: Re: 18 headstuds-how to tell them apart? |
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| 67 Sunroof wrote: |
Really? Why?
I would think the cromoly ones don’t have the proper stretch that an oe one would. |
These are the head studs of choice in CB's builders choice kits, and Military Spec 4140 Chromo. If the "proper stretch" was really a issue, CB would not recommend them. They are slightly longer, so you will need to trim them to size. It will be easier to use your 50 year old studs that have been heat cycled a million times though. |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76909
Location: Sneaking up behind you
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| Posted: Wed Dec 04, 2019 2:19 pm Post subject: Re: 18 headstuds-how to tell them apart? |
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| jpaull wrote: |
| 67 Sunroof wrote: |
Really? Why?
I would think the cromoly ones don’t have the proper stretch that an oe one would. |
These are the head studs of choice in CB's builders choice kits, and Military Spec 4140 Chromo. If the "proper stretch" was really a issue, CB would not recommend them. They are slightly longer, so you will need to trim them to size. It will be easier to use your 50 year old studs that have been heat cycled a million times though. |
Didn't take long to cut them.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare |
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jpaull
Samba Member
Joined: February 22, 2005
Posts: 3462
Location: Paradise, Ca
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| Posted: Wed Dec 04, 2019 2:49 pm Post subject: Re: 18 headstuds-how to tell them apart? |
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| Glenn, nice example. You have some sealent under the washers too which is a great thing to note to prevent leaks. |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 76909
Location: Sneaking up behind you
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| Posted: Wed Dec 04, 2019 2:55 pm Post subject: Re: 18 headstuds-how to tell them apart? |
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| jpaull wrote: |
| Glenn, nice example. You have some sealent under the washers too which is a great thing to note to prevent leaks. |
I used a nut as a guide and a simple hacksaw. Then chamfered the surface on a bench grinder and finally ran the nut up and down to clean up the threads. I put a small dab of grease on the end and finally installed the cut end into the case.
I then ran the washers on a belt sander to ensure they were flat.
Yes, a bit of Rightstuff under the washers and then cleaned off the excess.
Don't want any oil leaks.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
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rugblaster
Samba Member
Joined: March 31, 2016
Posts: 1170
Location: San Angelo, Texas
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| Posted: Wed Dec 04, 2019 3:24 pm Post subject: Re: 18 headstuds-how to tell them apart? |
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Use a automatic center punch. If you have an example of a stock stud, choose a place behind the threads and put a punch mark on it. Then punch the suspected chromoly stud and compare the two. Chromoly is a good bit harder, and may not make a mark at all. That is predicated on the idea that the suspect studs are, in fact, chromoly and not chinaesum alloy.
Tech inspectors use this method when determining if certain race cars do, in fact, have moly chassis/roll cages.
If you have ever worked with chromoly, grinding, bending or cutting, it is hard as a whore's heart.
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