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No4/No5 rear sight

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Shamu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: July 11 2019 at 6:40am
What is double-threaded?
I am unfamiliar with the term.
"except for the fact that the 1300-yard elevation screw is double-threaded, giving it an effective pitch approximately double that of the single-thread 800-yard screw."

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Post Options Post Options   Thanks (0) Thanks(0)   Quote The Armourer Quote  Post ReplyReply Direct Link To This Post Posted: July 11 2019 at 7:32am
Originally posted by Shamu Shamu wrote:

What is double-threaded?
I am unfamiliar with the term.
"except for the fact that the 1300-yard elevation screw is
double-threaded, giving it an effective pitch approximately double that
of the single-thread 800-yard screw.
"



A screw with a twin or double start thread has two threads running along the body of the screw instead of just one. Screws with twin-start threads often have a larger pitch, which means they can be inserted or removed twice as fast as a screw with a single-start thread. They will also hold material more securely.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: July 16 2019 at 12:07pm
this is interesting information regarding the double start thread on the 1300 yard sight. So I now have a question. Where the No8 .22 training rifles fitted with a sight based on the single start thread or the double start thread?

It would appear that a single start thread would be useful for target shooting.

But the double start would be faster adjusting for ranges changes on the battlefield.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: July 16 2019 at 2:08pm
OK thanks. WE call that  multi-start here. I knew the pitch was different but not that.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: July 16 2019 at 8:00pm
as to the indians - yes and no , the first 2A retained the 303 sight ladder the newer 2A1 had one modified to the 762 , it was simply worth looking at when one buys a sight , 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: July 17 2019 at 6:19am
Wasn't that essentially a SMLE?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: July 17 2019 at 9:42am
I never realized this about a No. 5 rear sight threads (I don't have one of these sights, but have several "No. 1" machined sights for the No. 4 rifle.  Looking at the photo, the pitch seems similar to that of the No. 1 machined sight on the No. 4, but I didn't realize it was a double start thread. 
It would be nice to have the machined sight used on the No. 5 rifle installed on the No. 4 for vintage competition giving approx. 1/2 MOA click adjustments, but that would not be considered "as issued" (not issued on a No. 4 rifle). 
 
I shot next to a guy in a match last month using a A3 Springfield who cleaned the 200 yard target having to aim at 12:00 on the bull.  That sight is finicky to adjust and he had to aim off after shooting his 5 sighters.  I don't know how he did it, I wouldn't be able to.    
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: July 17 2019 at 11:29pm
Looking at the two sights in the photo. I think the aperture in the No5 rifle sight appears larger daimeter than the No4 rifle sight. However I believe you could fit the single thread to the No4 rifle sight using the screw and threaded lug from the No5. That way you would get 0.5 MOA with the correct 200/1300 yard range. I doubt that anyone would see the change.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: July 18 2019 at 8:27pm
as to the OP original questions yes and yes , 
as to later questions yes - sorry for the confusion , just found it interesting that sights were confusing on both , 
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