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You guys want to hear a joke?

May 31 2017 at 4:38 PM
James V  (Login kimo57)
Group #188948

 
Called Williams peep sights today inquiring about their Twilight Peep apertures. Well the receptionist me connects to their expert. I asked the expert what is the thread size for their twilight peep & he tells me he does not know!!!
Anyone knows the thread size for their peeps?
Your stock should not be made of only walnut.


    
This message has been edited by kimo57 on May 31, 2017 10:54 PM


 
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AuthorReply
MDriskill
(Login MDriskill)
Group #188948

Peep threads

June 1 2017, 6:26 AM 

Williams, Lyman, Redfield, and other classic US sight eyepieces use a 7/32 X 40 thread.

German sights standardized on a 9.5 X 1.0 MM eyepiece thread by the 1950's. This facilitated an interesting aftermarket in accessories that will fit many different guns.

A really nifty thing to have is the inexpensive adapter bushing (sold by Champions Choice and others) which allows Euro disks to fit US sights. Here's one in action--an old HW 50 rifle, with a Williams sight sporting a Gehmann adjustable iris:

[linked image]

(As an aside...the fabled British Parker-Hale sights are also 7/32 X 40, though the steeper UK-standard thread angle makes the disk shaft slightly larger in diameter. Thus an odd situation where US disks fit P-H sights, but usually not the other way around. The exception is Lyman sights, which will usually take P-H disks.)


    
This message has been edited by MDriskill on Jun 29, 2017 6:39 PM


 
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DT Fletcher
(Login DTFletcher)
Group #188948

Crosman peep sight threading

June 1 2017, 10:05 AM 

The peep sights sometimes seen on the old 101 (1949 only)/107/108/109/110/113/114/118 rifles are also 7/32 X 40 thread.

 
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ChrisK
(Login r1lover)
Group #188948

Very informative Mike. Thanks for the extra effort/info. n/t

June 21 2017, 4:26 PM 


 
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Benny
(Login CrewSched)
Group #188948

Bushings

June 21 2017, 7:09 PM 

Gehmann also makes a bushing (PH999) to adapt larger European discs to the Williams sight. They use a M.40x10 fine thread and it works okay but could be a little tighter. Personally I prefer the Champions Choice bushing as it is a tighter fit and doesn't break loose when twisting my adjustable iris.

 
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Jim in SoCal
(Login jz2)
Group #188948

along the lines of this topic

June 29 2017, 1:01 AM 

I have FWB and HW diopter sights. I just bought a Gehmann iris and it fits the HW sight, but not any of the three FWB's (one from 300 and 2 from 601). Does anyone know why the difference?

thanks in advance

 
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MDriskill
(Login MDriskill)
Group #188948

That's odd...

June 29 2017, 6:34 PM 

I've seen FWB sights be just slightly stubborn, i.e. a little harder to start the thread, or seemingly having a slight taper--the iris shaft will get snug before it's all the way home. But the basic fit should definitely be there.

I have Anschutz, Feinwerkbau, Walther, and Weihrauch sights of a variety of vintages, and my Gehmann goodies fit all of them.

 
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Jim In SoCal
(Login jz2)
Group #188948

The Gehmann sight fits both walther sights

June 30 2017, 1:09 AM 

really tight in the FWB, only threads in half way. the threads seems visibly different. I have a thread gauge and will check when I get a moment. so right now I a walther sight with the gehmann iris on my FWB 601. works just fine.


 
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MDriskill
(Login MDriskill)
Group #188948

Gehmann fit

June 30 2017, 11:08 AM 

I rechecked last night, tried three different Gehmanns in a bunch of old sights, had no issues.

An older Gehmann with a longer threaded shaft, did stop short of going all the way home in an FWB 300S "Type 2" sight. But still was perfectly workable.

 
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plymouthairrifle
(Login plymouthairrifle)
Group #188948

metric threads

June 29 2017, 9:14 AM 

What do you mean by M.40x10 fine thread? In the metric thread system the first number is the diameter and the second number is the pitch of the thread(distance from the top of a thread to the next top of a thread).

 
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Benny
(Login CrewSched)
Group #188948

Re: metric threads

June 29 2017, 11:29 PM 

Yup, looks a little weird to me too but that's how they marked it. happy.gif

 
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