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Old 02-26-2014, 03:59 PM
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Internatonal 22 Forend thread size



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I have a Martini International Mk2 rifle. It has, in common with many target rifles, a strip of metal inset on the underside of the forend which has a number of threaded holes to facilitate the fitting of a hand stop. Can anyone help with the thread size / type?

TIA.



(Same info requested on the Winchester 52 section for that rifle also. Different threads.)
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Old 02-26-2014, 04:40 PM
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Originally Posted by shootist View Post
I have a Martini International Mk2 rifle. It has, in common with many target rifles, a strip of metal inset on the underside of the forend which has a number of threaded holes to facilitate the fitting of a hand stop. Can anyone help with the thread size / type?

TIA.



(Same info requested on the Winchester 52 section for that rifle also. Different threads.)
On the Martini, it'll be some obsolete British Standard thread. I forget what it is, but if I remember correctly a 6mm metric screw will work pretty well if you are careful not to overtighten. For more, you might try a search on the Martini forum of this site. I went thru the same thing awhile back on my MkII.
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Old 02-26-2014, 05:19 PM
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Well, I've tried a 0BA, which is near enough Metric. Fits but is sloppy. I've tried 1/4" Whitworth but it jams up, it's close though.

Can't be that many left.
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Old 02-27-2014, 10:44 PM
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Well, I've tried a 0BA, which is near enough Metric. Fits but is sloppy. I've tried 1/4" Whitworth but it jams up, it's close though.

Can't be that many left.
TRY 1/4 BSF (BRITISH STANDARD FINE), THAT WILL DO THE JOB. Tony
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Old 02-28-2014, 10:01 AM
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I used 1/4-28 screws to mount a track plate on my MK II.
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Old 02-28-2014, 10:13 AM
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Originally Posted by MARTINI SHOOTER View Post
TRY 1/4 BSF (BRITISH STANDARD FINE), THAT WILL DO THE JOB. Tony
Tony is correct, once again. The 1/4" BSF thread is actually 26 TPI with a slightly different thread profile, probably 55 degrees, instead of the "standard" 60 degrees for most V-type threads. You'll also need a 5.3mm tap drill, if you're going to drill and tap a 1/4" BSF thread. So, some of the other threads mentioned are close but not really correct.

I hope this helps,

TBR
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