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Can you cut a M8x1,25 to M6x1,0?
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Adriel Rowley
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PostPosted: Wed Oct 05, 2022 1:49 pm    Post subject: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Can you cut a M8x1,25 to M6x1,0?

The length of thread being reduced is 6mm, then cutting further for a length of 10mm total.

Thanks in advance! Very Happy
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PostPosted: Wed Oct 05, 2022 1:55 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Huh?

Are you asking if you can make a M8 bolt with a 1.25 pitch a M6 with a 1.0 pitch?
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PostPosted: Wed Oct 05, 2022 2:37 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Yes you can, you'd need to turn the m8 thread down to 6mm though before you cut the m6 thread.
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PostPosted: Wed Oct 05, 2022 2:47 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

What are you trying to build/modify/fix?

Step studs are pretty common and available. Especially m8 down to m6. I have a few in a pile on the bench. They send them with new aluminum cases to use with old non-doghouse oil coolers.

Brian
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PostPosted: Wed Oct 05, 2022 2:48 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

ACE Hardware has a nice selection of metric bolts and step studs.
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PostPosted: Wed Oct 05, 2022 4:36 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Yes, you can
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PostPosted: Wed Oct 05, 2022 5:34 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

I can, doesn't mean you can.
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PostPosted: Wed Oct 05, 2022 6:31 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Glenn wrote:
Huh?

Are you asking if you can make a M8 bolt with a 1.25 pitch a M6 with a 1.0 pitch?


Oops, sorry I was not clear. Yes, that is correct, except a stud.
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PostPosted: Wed Oct 05, 2022 6:32 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

UK Luke 72 wrote:
Yes you can, you'd need to turn the m8 thread down to 6mm though before you cut the m6 thread.


Thank you. I don't have a lathe, hmmm.
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PostPosted: Wed Oct 05, 2022 6:38 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Brian_e wrote:
What are you trying to build/modify/fix?

Step studs are pretty common and available. Especially m8 down to m6. I have a few in a pile on the bench. They send them with new aluminum cases to use with old non-doghouse oil coolers.

Brian


Brian, thank you for the help and asking.

I am adding a Maxi spin on filter to Ruby's 1200cc engine. Being the engine is in fantastic shape (about 125psi of compression despite over 250,000 miles) I am nervous about drilling and tapping the case.

The length of the stud needs to be at least 40mm, 9mm longer than the oil cooler step studs (10mm case depth, 25mm thickness of the oil pump and oil filter casting, plus enough to get nuts on).
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PostPosted: Wed Oct 05, 2022 6:42 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Glenn wrote:
ACE Hardware has a nice selection of metric bolts and step studs.


Oh? Okay, thank you for letting me know!

I will see if can bum a ride over there (why buy most everything online). My friend says he is enabling me to get transportation from others, then gets upset when I buy a water pump pick online when he take me to Harbor Fright, then when ask when can we go, says not transporting me because that be enabling. Rolling Eyes Laughing Wish knew why neurotypicals are so confusing.
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PostPosted: Wed Oct 05, 2022 6:43 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

modok wrote:
Yes, you can


Thank you.
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PostPosted: Wed Oct 05, 2022 6:43 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

bsairhead wrote:
I can, doesn't mean you can.


Laughing

You have ice handy? Laughing

Thanks for the chuckle, needed it.
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https://www.thesamba.com/vw/forum/viewtopic.php?p=9252810#9252810

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PostPosted: Wed Oct 05, 2022 6:46 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Adriel Rowley wrote:
Brian_e wrote:
What are you trying to build/modify/fix?

Step studs are pretty common and available. Especially m8 down to m6. I have a few in a pile on the bench. They send them with new aluminum cases to use with old non-doghouse oil coolers.

Brian


Brian, thank you for the help and asking.

I am adding a Maxi spin on filter to Ruby's 1200cc engine. Being the engine is in fantastic shape (about 125psi of compression despite over 250,000 miles) I am nervous about drilling and tapping the case.

The length of the stud needs to be at least 40mm, 9mm longer than the oil cooler step studs (10mm case depth, 25mm thickness of the oil pump and oil filter casting, plus enough to get nuts on).



https://belmetric.com/?gclid=Cj0KCQjw1vSZBhDuARIsA...YsEALw_wcB
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Adriel Rowley
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PostPosted: Wed Oct 05, 2022 6:53 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

Dale M. wrote:
Adriel Rowley wrote:
Brian_e wrote:
What are you trying to build/modify/fix?

Step studs are pretty common and available. Especially m8 down to m6. I have a few in a pile on the bench. They send them with new aluminum cases to use with old non-doghouse oil coolers.

Brian


Brian, thank you for the help and asking.

I am adding a Maxi spin on filter to Ruby's 1200cc engine. Being the engine is in fantastic shape (about 125psi of compression despite over 250,000 miles) I am nervous about drilling and tapping the case.

The length of the stud needs to be at least 40mm, 9mm longer than the oil cooler step studs (10mm case depth, 25mm thickness of the oil pump and oil filter casting, plus enough to get nuts on).



https://belmetric.com/?gclid=Cj0KCQjw1vSZBhDuARIsA...YsEALw_wcB


Thank you.

Weird, now only have the 25mm and 31mm lengths:https://belmetric.com/m6-to-m8-stepped-stud-class-8-8-steel/?.
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PostPosted: Wed Oct 05, 2022 8:11 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

You would be better off to just tap the oil pump holes to 8mm. You can minimize the aluminum cuttings and your adding a filter so it would trap anything left and there is probably worse stuff in the sump already since you didn't have a filter!
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PostPosted: Wed Oct 05, 2022 9:43 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

You cannot just drill and install 8mm studs where there 6mm studs go. The 8mm oil pump holes are offset from the 6mm Stud holes.
I built a jig many years ago out of a 8mm steel pump cover and welding tubing pieces to so drill would go straight when drilling offset holes.
It is really is best to do this in a mill.
If it was mine and did want to take engine apart, I would just use longer 6mm bolts.
It does work and has been done before. Pump is not going to rotate.
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PostPosted: Wed Oct 05, 2022 10:03 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

I agree, maybe some thick washers.
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PostPosted: Wed Oct 05, 2022 10:26 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

jsturtlebuggy wrote:
You cannot just drill and install 8mm studs where there 6mm studs go. The 8mm oil pump holes are offset from the 6mm Stud holes.
I built a jig many years ago out of a 8mm steel pump cover and welding tubing pieces to so drill would go straight when drilling offset holes.


I just use a old 8mm pump body so it gets perfectly centered!
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PostPosted: Thu Oct 06, 2022 9:40 pm    Post subject: Re: Can you cut a M8x1,25 to M6x1,0? Reply with quote

RCP Phx wrote:
You would be better off to just tap the oil pump holes to 8mm. You can minimize the aluminum cuttings and your adding a filter so it would trap anything left and there is probably worse stuff in the sump already since you didn't have a filter!


Why I am going to put some 1990s vintage oil in and run for a while. I was going to do this previously, had to move in a hurry, didn't have time to button up the valve train and put the cover on, thought the engine was level, however, it was not, filled the floor of Ruby with oil, now don't have to worry about the pan rusting further. Laughing
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