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Old 04-17-2017, 03:45 AM   #1
johnf
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Default Lyman folding sight screw size

I lost one and Lyman dont answer emails.

thanks



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Old 04-17-2017, 07:55 PM   #2
NYECOGunsmith
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If my aging grey cells are firing in the right order, that looks like a Lyman #16 rear sight, they came in three versions, A,B,C, with the differences being in the elevation adjustment range.

And if memory serves, those elevation clamp screws are 3-56 thread, and Brownell s carries them. Might be 4-40, but the 3-56 size is the first one that comes to mind. Don't remember it being as large as a 6-48 at any rate.

You can always take out the remaining screw and measure its diameter and threads per inch if you want to be sure, or acquire a 3-56 & 4-40 screws and try them.

Or you could use the inside measurement tips on your caliper and measure the width of the slot the missing screw was in, if you don't want to take out the remaining screw and lose your elevation adjustment.

Tell me what the width of that screw slot is and I can make an educated guess as to the size of the clamp screw that goes in there.

A 3-56 screw is .0990" in diameter with 56 threads per inch, and a 4-40 is .1120" in diameter, with 40 threads per inch. It could also be an older one, with 3-48 threads, but that sight looks too new to be one of those.

Call them, tell them what sight you have and ask for the elevation clamp screws, they used to be about three bucks a pair.

The entire sight can be found for about $15 by the way.

You can also try calling Lyman, they are open from 0900 to 1645 M-F, numbers I have are 1-800-225-9626 and 1-800-423-9704, 1-860-632-2020 and a fax number of 1-860-632-1699. Dunno if any of those are still good or not, give 'em a try and see.
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Last edited by NYECOGunsmith; 04-17-2017 at 09:37 PM. Reason: Added info.
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Old 04-19-2017, 02:12 AM   #3
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Quote:
Originally Posted by NYECOGunsmith View Post
If my aging grey cells are firing in the right order, that looks like a Lyman #16 rear sight, they came in three versions, A,B,C, with the differences being in the elevation adjustment range.

And if memory serves, those elevation clamp screws are 3-56 thread, and Brownell s carries them. Might be 4-40, but the 3-56 size is the first one that comes to mind. Don't remember it being as large as a 6-48 at any rate.

You can always take out the remaining screw and measure its diameter and threads per inch if you want to be sure, or acquire a 3-56 & 4-40 screws and try them.

Or you could use the inside measurement tips on your caliper and measure the width of the slot the missing screw was in, if you don't want to take out the remaining screw and lose your elevation adjustment.

Tell me what the width of that screw is and I can make an educated guess as to the size of the clamp screw that goes in there.

A 3-56 screw is .0990" in diameter with 56 threads per inch, and a 4-40 is .1120" in diameter, with 40 threads per inch. It could also be an older one, with 3-48 threads, but that sight looks too new to be one of those.

Call them, tell them what sight you have and ask for the elevation clamp screws, they used to be about three bucks a pair.

The entire sight can be found for about $15 by the way.

You can also try calling Lyman, they are open from 0900 to 1645 M-F, numbers I have are 1-800-225-9626 and 1-800-423-9704, 1-860-632-2020 and a fax number of 1-860-632-1699. Dunno if any of those are still good or not, give 'em a try and see.
Thanks for taking the time to reply Steve.
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