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JRD
 Post subject: Old, odd JIS threads
PostPosted: Fri Jan 04, 2019 4:17 pm 
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Joined: Thu Jun 09, 2011 6:26 pm
Posts: 901
Location: Zionsville,PA
Someone posted this on a machining forum I'm on so I thought I would share since some folks may have pre-67 cycle with these "odd" threads.
Jeff

Pre Apr 1967 JIS
3mm.....0.6
4mm.....0.75
5mm.....0.9
8mm.....1.00
10mm...1.25
12mm...1.5

post Apr 1967 ISO
3mm.....0.5
4mm.....0.7
5mm.....0.8
8mm.....1.25
10mm...1.5
12mm...1.75

( corrected. thanks Dale )


Last edited by JRD on Fri Jan 04, 2019 6:44 pm, edited 1 time in total.

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mraxl
 Post subject: Re: Old, odd JIS threads
PostPosted: Fri Jan 04, 2019 6:17 pm 
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Joined: Tue Jun 07, 2011 6:36 am
Posts: 2694
Location: Dandridge, TN, USA
I believe post 1967 12mm should be 1.75.
https://en.wikipedia.org/wiki/ISO_metric_screw_thread

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JRD
 Post subject: Re: Old, odd JIS threads
PostPosted: Fri Jan 04, 2019 6:44 pm 
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Joined: Thu Jun 09, 2011 6:26 pm
Posts: 901
Location: Zionsville,PA
mraxl wrote:
I believe post 1967 12mm should be 1.75.
https://en.wikipedia.org/wiki/ISO_metric_screw_thread


Correct ( I just copied and pasted, didn't verify )

edited

pic from my chart in my home shop
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III
 Post subject: Re: Old, odd JIS threads
PostPosted: Sat Jan 05, 2019 3:59 am 
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Joined: Wed Jun 08, 2011 10:41 pm
Posts: 3489
Location: Mount Vision, NY
Great post Jeff, thanks
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