Hi Amigo's,
I know the thread for FN'S are 1:100 x 12tpi.
What is the Major and minor dimentions? All help greatly appreciated.
Dan

Not to complicate your question.....While I thread the barrels for mauser actions 1.100 X 12 TPI I've always labored under the impression that the real thread is actually metric .....it's 28 X 2 and the 1.1 X 12 is close enough to get the job done as very few of us have a lathe to cut metric threads.

I was also told once that the threads in Mausers are 55 deg as opposed to our 60 deg thread form.

Maybe someone can elaborate on this.

Vap,

Mausers are threaded with a Whitworth thread; not quite standard, not quite metric...

I just looked in my Kuhnhausen and he states that the threads are 1.1x12. Nothing about a metric equivalent.

He goes on to state that"All Mauser 91-98 barrels have non-metric 55Ëš Whitworth Std. threads".

He goes on to say that most US made sporter barrels for these receivers are 60Ëš std. vee thread and they can be threaded into the reciever but he doesn't recommend it. He says to either use a barrel with the correct threads or chase the receiver threads.

1.1x12 55 degree is the actual..

i've only had to recut for Oberndorf mauser to 55, while 60 worked fine in all the rest...
jeffe

I've never understood the reluctance to cut a proper 55 degree thread when it is so easy to do. Everyone acts like it is black magic to grind a 55 degree tool.

quote:

Originally posted by z1r:
I've never understood the reluctance to cut a proper 55 degree thread when it is so easy to do. Everyone acts like it is black magic to grind a 55 degree tool.

There you go injecting logic and reason into this!

Brownell’s sells the bits already ground if someone is too lazy to do their own.

These specifications for Mauser threads, 1.1x12, 55 degree, Witworth Standard, are they being used
on the currently produced Mausers also?????

How hard is it to grind a 55 degree threading tool? Rocket science it's not!

quote:

Originally posted by DanH:
Hi Amigo's,
I know the thread for FN'S are 1:100 x 12tpi.
What is the Major and minor dimentions? All help greatly appreciated.
Dan

Dan H...so far we've established the thread you asked about but no one has answered your question.
If you go to the machinery's handbook and look up whitworth threads you should find all the specs for the 1.10 X 12 including major diameter, minor diameter of ID and OD threads. This should also include the 55 degree thread form. Using a pitch mike to measure these threads cannot be done however ...you'll have to measure pitch over wires.

I don't worry about thread root diameter for the simple reason that I thread each barrel to the best fit for the action I am working on. They are NOT all the same. One that stands out is the 1909 arg. actions. They do have a smaller minor diameter ( thread root diameter ) than most other Mausers. I don't use the one size fits all approch.

Thanks Gentelmen. Thats why I love this place. I should get the barrel tomorrow or next day. After I finish with it I will let you know how she shoots. Its getting springtime in the rockies early this year looks like
Dan