Third Party Press

KM band screw survey!

flynaked

flynaked

Repo Field Gear Collector
Okay, the current screws are shown below, I measured an original for these dimensions, however I would like a little feedback as not all the makers are the same, I believe I dimensioned this off an Oberndorf screw, however the shank diameter which is within .001 of that original is a bit tight in most of my Brünn stocks, but still works just fine. I’m thin on KM’s so not much help in testing. If anyone has any wildly different looking original screws to compare, any feedback would be appreciated, trying to see what common shank diameters are measuring. I am trying to shoot for a screw that will work in most any stock’s original band screw holes.
 

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I'm currently in the Cali desert but when I return I'd gladly photograph and mic the Steyr screws I have.
 
Those are Mauser/Steyr type (they are practically identical). The Czech screws are much different, and are made from vz24 stock disc screws which have much larger heads.


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Okay thanks! So does this look like an original Czech? The last two corncob stocks I found each only had one screw and I wasn’t sure if they were correct, this one is phosphate. If this is an original do the spanners follow the same overall pattern minus the engagement method of course?

* appreciate the offer HM, looks like they are the correct size then for Oberndorf/Steyr
 

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IMO that looks too small to be wartime Czech, but could be I guess. Every original KM rifle I’ve found with original screws have very large screws. I’ll try to post some photos. Also- note how the typical Czech band screw hole is large and swallows those tiny screws up, like the recent dot 44 you fixed.


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The mauser/steyr screws seem to be the one's in demand. the Czech type not so much. Also the smaller screw for the end cap.

The Czech type used a spanner then a spanner with a slot cut. I knew a guy who had a whole bin full of them. Now deceased.
Czech type are also "heavily" tapered on the back side.

That's why the Czech bands are always counter sunk. Mauser and steyr aren't.
 
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Mauser and Steyr are also tapered on the backside, see the first pics. At least originals are.


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Thanks for the info guys! Darn, yeah I did notice how much deeper the C/S are in the Czech bands, but also see a fair bit of over C/S in Oberndorf etc, but I suppose not to that degree. Thanks for the input and I sure would appreciate screw head dimensions if you get a chance on the Czechs, that’s all I lack on my Swp! M99, wouldn’t that be a nice bucket!? I have also made up some cap screws as well.


Here’s a quick bit for dimensions needed, this is for the above screw of course but still works.
 

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Maybe this thread will help?

http://www.k98kforum.com/showthread.php?18481-Kriegsmodell-screw-size

(A) Seems like the head diameter on MO/Steyr endcap & band screws run about ~.245"
(B) Shank diameter on end plate screws ~.120" and ~.165" on the band screws



Measurements (D) & (E) with thread pitch would help also. Keep in mind thread pitch and length of measurement (E) is very important when using reproduction screws in original stocks as an incorrect thread pitch and incorrect length of (E) will damage/strip the existing threads in the original wood:
 

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Yes indeed thank you for the input, those 3 dimensions were just references I needed for the Czechs. I actually took about 15 different dimensions when working on the above Oberndorf/Steyr screws. There are at least two sizes of end cap screws too as my Swp measures larger than your indicated .120, now I need to determine if Oberndorf/Steyr exclusively use the smaller or larger end cap screw. :googlie. Which maker did that particular end cap screw come from?

THunter said:
Maybe this thread will help?

http://www.k98kforum.com/showthread.php?18481-Kriegsmodell-screw-size

(A) Seems like the head diameter on MO/Steyr endcap & band screws run about ~.245"
(B) Shank diameter on end plate screws ~.120" and ~.165" on the band screws



Measurements (D) & (E) with thread pitch would help also. Keep in mind thread pitch and length of measurement (E) is very important when using reproduction screws in original stocks as an incorrect thread pitch and incorrect length of (E) will damage/strip the existing threads in the original wood:
Click to expand...
 
The .120” shank diameter for the end plate screw came from jbmauser’s no letter block byf45
 
Well, I gave it the dumb cowboy approach and took some ratios off of pictures for spanner hole sizes and noted that Czech screws typically fill the majority of the band countersink as was mentioned, so I made these up for my swp, had to go .054 larger head diameter than the other standard screws. Without an actual screw reference these will have to work for my project as they do fit the existing stock threads nicely, time for bluing!
 

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