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Standard vs. metric thread question #3255213
09/01/24 09:40 PM
09/01/24 09:40 PM
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Detroit area
6PAX Offline OP
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I'm looking at purchasing a shifter handle ball to replace the one that came with my Hurst Pro Matic shifter. The shifter handle is threaded 3/8-16. The threads on the shifter ball I want to get are metric and it comes with an M10x1.5 adapter. I understand that there is a slight difference in the thread size but the M10 adapter will thread onto the 3/8-16 thread on the handle. Since changing the gears with the Pro Matic shifter involves lifting up on the handle, my question is, will the metric adapter allow the shifter ball to tighten securely on the shifter handle to accommodate the lifting of the handle or will it be a little loose?

Re: Standard vs. metric thread question [Re: 6PAX] #3255215
09/01/24 09:55 PM
09/01/24 09:55 PM
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Rittman Ohio
fourgearsavoy Offline
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I really don't like any shift knob with an adaptor. They always come loose on a stick shift car twocents

Gus beer


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Re: Standard vs. metric thread question [Re: 6PAX] #3255237
09/01/24 11:43 PM
09/01/24 11:43 PM
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N.E. OHIO, USA
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Green Loctite or at the very least Red Loctite should secure it but as far as removing it with the Green Loctite (aka "bearing mount") that may raise a question or issue?

Re: Standard vs. metric thread question [Re: A12] #3255259
09/02/24 01:41 AM
09/02/24 01:41 AM
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Park Forest, IL
slantzilla Offline
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Loctite the adapter into the ball and use a thin locknut on the handle.


"Everybody funny, now you funny too."
Re: Standard vs. metric thread question [Re: 6PAX] #3255281
09/02/24 07:48 AM
09/02/24 07:48 AM
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Oregon
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earlymopar Offline
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Oregon
Your idea of using the M10 female thread on a 3/8 - 16 male thread is not going to work so well. The tap drill size for a 3/8-16 is 5/16" (.3125"). The tap drill size for an M10 is 9.25mm (.3645") which makes for a huge mis-match in the diametral fit between the 2 thread types. Going on to the thread fit, a 3/8-16" has one thread every 1/16" of an inch whereas the M10 has a thread every .050" of an inch. The threads being relatively close in conjunction with the huge diametral difference are all that is allowing you to get these parts to assemble but is still far from optimum.

Your existing threaded insert on the ball should be perfect for drilling out (with an "X" drill size of .397"), tapping it and adding a 3/8-16 heli-coil. Everything comes in one of their kits. "Heli-Coil 5521-6 3/8-16 Inch Coarse Thread Repair Kit"

Re: Standard vs. metric thread question [Re: earlymopar] #3255285
09/02/24 08:27 AM
09/02/24 08:27 AM
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ruderunner Offline
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This.

But, you'd think a knobs made for a shifter would have the correct threads to begin with.


Angry white pureblood male
Re: Standard vs. metric thread question [Re: ruderunner] #3255289
09/02/24 09:11 AM
09/02/24 09:11 AM
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rust belt
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Moparite Offline
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Not it they are made in China. Not sure what kind of ball you are looking at but you can get different ones with the thread you need here.

Re: Standard vs. metric thread question [Re: Moparite] #3255318
09/02/24 11:35 AM
09/02/24 11:35 AM
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north of coder
moparx Offline
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if the ball you are wanting can't be sourced in the link Moparite posted, using the helicoil fix posted above would be my choice, instead of trying to cob together a metric insert that will eventually fail, most likely sooner than later.
also, the thin "jam nut" is an excellent suggestion, as it will secure the ball in the position you want, as well as allowing for easy removal if needed, as opposed to using the green or red loctite.
just my personal life experience "playing with full size cars" for almost 60 years.
your mileage will vary.
beer

Re: Standard vs. metric thread question [Re: moparx] #3255362
09/02/24 02:13 PM
09/02/24 02:13 PM
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ILLINOIS
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volaredon Offline
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No... The REAL question is why in the hell did everyone have to bastardize everything and convert to metric to begin with

Re: Standard vs. metric thread question [Re: volaredon] #3255363
09/02/24 02:27 PM
09/02/24 02:27 PM
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Kirkland, Washington
Pacnorthcuda Offline
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Originally Posted by volaredon
No... The REAL question is why in the hell did everyone have to bastardize everything and convert to metric to begin with



Actually, in the big picture, Metric was first. And if you think about it, it makes more sense.

Re: Standard vs. metric thread question [Re: Pacnorthcuda] #3255367
09/02/24 02:57 PM
09/02/24 02:57 PM
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Sniper Offline
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Originally Posted by Pacnorthcuda
Originally Posted by volaredon
No... The REAL question is why in the hell did everyone have to bastardize everything and convert to metric to begin with



Actually, in the big picture, Metric was first. And if you think about it, it makes more sense.


Well, USS standards predated Metric standards by 34 years, I'd say no metric wasn't first.

Re: Standard vs. metric thread question [Re: Sniper] #3255394
09/02/24 05:07 PM
09/02/24 05:07 PM
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N.E. OHIO, USA
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Originally Posted by Sniper
Originally Posted by Pacnorthcuda
Originally Posted by volaredon
No... The REAL question is why in the hell did everyone have to bastardize everything and convert to metric to begin with



Actually, in the big picture, Metric was first. And if you think about it, it makes more sense.


Well, USS standards predated Metric standards by 34 years, I'd say no metric wasn't first.



Are we talking in the USA or in general world history? Don't know if the following is true or correct but "I found it on the internet so it MUST BE TRUE.

1832
United States customary units form a system of measurement units commonly used in the United States and most U.S. territories, since being standardized and adopted in 1832. The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country.


30 March 1791
The metric system was officially invented on 30 March 1791 when the French Assembly accepted a proposal for a uniform standard of weights and measures. It was passed into French Law on 7 April 1795. The metric system is an international decimal system of weights and measures. It was officially adopted in France on December 10, 1793. The metric system succeeded the decimalized system based on the meter introduced in France in the 1790.


Re: Standard vs. metric thread question [Re: A12] #3255485
09/02/24 11:29 PM
09/02/24 11:29 PM
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Round Lake Beach, Illinoisy
Rhinodart Offline
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Anything the French developed should never be anything the US should use... tsk


The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

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Re: Standard vs. metric thread question [Re: Rhinodart] #3255497
09/03/24 01:13 AM
09/03/24 01:13 AM
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N.E. OHIO, USA
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Originally Posted by Rhinodart
Anything the French developed should never be anything the US should use... tsk


Totally agree!

Re: Standard vs. metric thread question [Re: A12] #3255507
09/03/24 07:39 AM
09/03/24 07:39 AM
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Sniper Offline
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Originally Posted by A12
Originally Posted by Sniper
Originally Posted by Pacnorthcuda
Originally Posted by volaredon
No... The REAL question is why in the hell did everyone have to bastardize everything and convert to metric to begin with



Actually, in the big picture, Metric was first. And if you think about it, it makes more sense.


Well, USS standards predated Metric standards by 34 years, I'd say no metric wasn't first.



Are we talking in the USA or in general world history? Don't know if the following is true or correct but "I found it on the internet so it MUST BE TRUE.

1832
United States customary units form a system of measurement units commonly used in the United States and most U.S. territories, since being standardized and adopted in 1832. The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country.


30 March 1791
The metric system was officially invented on 30 March 1791 when the French Assembly accepted a proposal for a uniform standard of weights and measures. It was passed into French Law on 7 April 1795. The metric system is an international decimal system of weights and measures. It was officially adopted in France on December 10, 1793. The metric system succeeded the decimalized system based on the meter introduced in France in the 1790.



We were talking about metric vs SAE threads,

Inches/feet/yards/miles have been around for longer than there was the country called France, much less a metric system.

Re: Standard vs. metric thread question [Re: Sniper] #3255522
09/03/24 09:52 AM
09/03/24 09:52 AM
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N.E. OHIO, USA
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https://en.wikipedia.org/wiki/United_States_Standard_thread shruggy


United States Standard thread (USS thread), also known as Sellers Standard thread,[1] Franklin Institute thread[1] and American Standard thread,[2] is a standard for inch based threaded fasteners and washers.[3]

The USS standard is no longer supported. It, together with the SAE fastener standard, was incorporated into the Unified Thread Standard. However, the term, USS, continues to be used occasionally today to describe inch based threaded fasteners with a coarse thread pitch and inch based washers that are a little bit larger than the corresponding SAE washer. The Unified Thread Standard uses the term UNC (Unified Coarse) to describe a fastener that previously would have been designated USS and UNF (Unified Fine) to describe a fastener that would have previously been designated SAE.

Re: Standard vs. metric thread question [Re: Sniper] #3255524
09/03/24 10:03 AM
09/03/24 10:03 AM
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If I remember correctly, one system is based on units or increments of 12's and the other is based on units of 10's. God gave most humans 10 fingers and ten toes to make things easier to count, just saying. I can live with both systems and understand fractions, but the metric is much easier to work with when it comes to crawling out from under the car to get the next size up or down wrench when that 10mm wrench doesn't fit. wink

Re: Standard vs. metric thread question [Re: A12] #3255542
09/03/24 11:14 AM
09/03/24 11:14 AM
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moparx Offline
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Originally Posted by A12
Originally Posted by Rhinodart
Anything the French developed should never be anything the US should use... tsk


Totally agree!


Inspector Clouseau would disagree, i'm sure................ whistling panic boogie biggrin
beer

Re: Standard vs. metric thread question [Re: 6PAX] #3255588
09/03/24 03:02 PM
09/03/24 03:02 PM
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Find a friend with a lathe and make a proper adapter. Make several extra to sell on eBay to cover the cost of beer


In theory, there is no difference between theory and practice. In practice, there is.
Re: Standard vs. metric thread question [Re: GomangoCuda] #3255713
09/04/24 12:49 AM
09/04/24 12:49 AM
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Fulton County, PA
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CMcAllister Offline
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Trying to jam metric threads onto standard threads, or vice versa, is a recipe to tear up everything.

Same with metric tools on standard fasteners, or vice versa.

Don't be a hilljack who doesn't understand what the numbers mean, and uses the "close enough" and/or "well, it fit" system.


If the results don't match the theory, change the theory.
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