25mm rings 1" scope

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25mm rings 1" scope

Post by valkyrie » 07 Sep 2017, 10:51 pm

Just wondering if its ok to use 25mm rings on a scope with a 1" tube? Any help appreciated
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Re: 25mm rings 1" scope

Post by Gwion » 08 Sep 2017, 5:42 am

Yes, mate. Don't over think it. The 25mm rings are for 1" tubes. Same same.
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Re: 25mm rings 1" scope

Post by straightshooter » 08 Sep 2017, 8:12 am

To be pedantic 1" = 25.4mm.
As an aside
If you put a 1" (25.4mm) scope tube in 26mm rings problems will arise.
Similarly a 26mm scope tube won't fit in 1" rings.
Avoid rings that say they are 1" and 26mm.
The rings can only be truly compatible with one tube size or the other or neither but not both.
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Re: 25mm rings 1" scope

Post by Gwion » 08 Sep 2017, 8:27 am

Yes, I know what an inch is but no manufacturer marks 25.4mm on their products and for all intents and purposes 25mm & 1" are the same.
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Re: 25mm rings 1" scope

Post by Cooper » 08 Sep 2017, 11:34 am

But there is such a thing as a 26mm scope and 26mm rings. So a 26mm scope shouldn't be fitted to 25.4mm rings. But yeah generally 1 inch is just 25mm(25.4)
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Re: 25mm rings 1" scope

Post by valkyrie » 08 Sep 2017, 9:14 pm

Cheers for the feedback guys
Remington 700 sf .308
Mossberg 4x4 22-250
Brno model 1 .22
Trusty 12 gauge
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Re: 25mm rings 1" scope

Post by Wombat » 08 Sep 2017, 10:34 pm

straightshooter wrote:To be pedantic 1" = 25.4mm.
As an aside
If you put a 1" (25.4mm) scope tube in 26mm rings problems will arise.
Similarly a 26mm scope tube won't fit in 1" rings.
Avoid rings that say they are 1" and 26mm.
The rings can only be truly compatible with one tube size or the other or neither but not both.


If you really want to be pedantic- The (international) inch has been exactly 25.4 mm since July 1959. At this point in time the (international) yard was redefined as 0.9144 metre - until this time the ratio between the US yard and the metre was different to the ratio between the UK yard and the metre. For more information, see Engineering Metrology by K J Hume (2 ed) Macdonald London 1967. The American inch changed by 2 millionths of an inch and the UK inch by 1.7 millionths of an inch. The international inch falls mid way between the old UK and US inch. :)
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Re: 25mm rings 1" scope

Post by Gwion » 09 Sep 2017, 7:21 am

Yep. That's pretty pedantic! :lol: :drinks:
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Re: 25mm rings 1" scope

Post by Hugh » 09 Sep 2017, 3:26 pm

I have a Kahles that is 26mm,i use Brownells spacers with 30mm rings,will chase down proper 26mm rings in next years US trip.
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Re: 25mm rings 1" scope

Post by Daddybang » 09 Sep 2017, 3:40 pm

Wombat wrote:
straightshooter wrote:To be pedantic 1" = 25.4mm.
As an aside
If you put a 1" (25.4mm) scope tube in 26mm rings problems will arise.
Similarly a 26mm scope tube won't fit in 1" rings.
Avoid rings that say they are 1" and 26mm.
The rings can only be truly compatible with one tube size or the other or neither but not both.


If you really want to be pedantic- The (international) inch has been exactly 25.4 mm since July 1959. At this point in time the (international) yard was redefined as 0.9144 metre - until this time the ratio between the US yard and the metre was different to the ratio between the UK yard and the metre. For more information, see Engineering Metrology by K J Hume (2 ed) Macdonald London 1967. The American inch changed by 2 millionths of an inch and the UK inch by 1.7 millionths of an inch. The international inch falls mid way between the old UK and US inch. :)


Wombat mate ya need to spend more time shooting! :drinks: :drinks:
This hard living ain't as easy as it used to be!!!
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Re: 25mm rings 1" scope

Post by BRNO_Bigot » 11 Sep 2017, 10:29 pm

Daddybang wrote:
Wombat wrote:
straightshooter wrote:To be pedantic 1" = 25.4mm.
As an aside
If you put a 1" (25.4mm) scope tube in 26mm rings problems will arise.
Similarly a 26mm scope tube won't fit in 1" rings.
Avoid rings that say they are 1" and 26mm.
The rings can only be truly compatible with one tube size or the other or neither but not both.


If you really want to be pedantic- The (international) inch has been exactly 25.4 mm since July 1959. At this point in time the (international) yard was redefined as 0.9144 metre - until this time the ratio between the US yard and the metre was different to the ratio between the UK yard and the metre. For more information, see Engineering Metrology by K J Hume (2 ed) Macdonald London 1967. The American inch changed by 2 millionths of an inch and the UK inch by 1.7 millionths of an inch. The international inch falls mid way between the old UK and US inch. :)


Wombat mate ya need to spend more time shooting! :drinks: :drinks:



Nope - if he knows all that, just think of the precision he can measure his groups to .... :geek:
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Re: 25mm rings 1" scope

Post by Wombat » 11 Sep 2017, 10:51 pm

Some things you just dont measure, unless you are sure the answer will be impressive.

When I started 25 odd years ago doing the same stuff I am now there was an old Bloke who got very very upset whenever a certain 1'' alloy rod looked like it was going to be used. He was adamant that it was not going to be wasted where another piece could be used instead.Caused him no end of upset as it was the last piece of Imperial inch stock available.So I did research it and pointed out that minor temperature variations would move the size much more than the new standard. Lots of arguments.
He died about 10 years ago.
But today, after moving factories and updating machinery there's still a section of 1" imperial std alloy rod on the rack, marked "Do Not Use - ask John". Still makes me smile whenever I see it.
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Re: 25mm rings 1" scope

Post by Gwion » 12 Sep 2017, 8:18 am

Wombat wrote:Some things you just dont measure, unless you are sure the answer will be impressive.

When I started 25 odd years ago doing the same stuff I am now there was an old Bloke who got very very upset whenever a certain 1'' alloy rod looked like it was going to be used. He was adamant that it was not going to be wasted where another piece could be used instead.Caused him no end of upset as it was the last piece of Imperial inch stock available.So I did research it and pointed out that minor temperature variations would move the size much more than the new standard. Lots of arguments.
He died about 10 years ago.
But today, after moving factories and updating machinery there's still a section of 1" imperial std alloy rod on the rack, marked "Do Not Use - ask John". Still makes me smile whenever I see it.


Haha... That's a great story! :thumbsup:
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