Old cz455 rimfire - thread ?

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Old cz455 rimfire - thread ?

Post by TassieTiger » 29 Mar 2020, 4:47 pm

Trying to make up a cap / cover that has been lost on my cz.
Does anyone know the Au thread / pitch ? No, I’m not making anything illegal, just want to cover the bare threads. I only have a m12 1.75 and 1.5 tap but my measurements are showing imperial?
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Re: Old cz455 rimfire - thread ?

Post by Member-Deleted » 29 Mar 2020, 6:07 pm

is it 1/2-20?
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Re: Old cz455 rimfire - thread ?

Post by Wm.Traynor » 29 Mar 2020, 7:54 pm

The threaded portion on my 455 measures a half inch but my 12 X 1.25 mm tap won't fit. Tried to count the number of teeth, at the crests in 0.230" but my eyes cant tell if it is 6 or 7. How Embarrassment!
Sorry TT.
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Re: Old cz455 rimfire - thread ?

Post by TassieTiger » 29 Mar 2020, 8:17 pm

I’m same WM - not sure if I counted 20 TPI or...I tried my external tap on barrel - 12 x 1.5 seems to start nicely for 2 or 3 threads and then locks...which isn’t quite right.
I’ve googled but USA appears to report 2 diff threads on the cz and who knows if Aust delivered was the same or not.
Tikka .260 (Z5 5x25/52)
Steyr Pro Varmint .223 - VX 3
CZ455 .22 & Norinco .22 (vtex 4-12, bush 3-9)
ATA 686 U/O 12g & Baikal S/S 12g.
Adler a110 reddot
Sauer 30-06 - VX 3
Howa 300 win mag. SHV 5-20/56
Marlin SBL 45/70
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Re: Old cz455 rimfire - thread ?

Post by SPRINT-GTO » 09 Apr 2020, 10:41 pm

Yeah, I was also looking for that old thread on the CZ455 that a member was having a great deal of problems with (Tomek) but could not locate it or find out what the final result was ?? Did he finally get the rifle sorted out & what was the problem/& the solution??
Just purchased a CZ455 & keen to know how it all worked out?
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Re: Old cz455 rimfire - thread ?

Post by John » 10 Apr 2020, 9:01 pm

1/2 national fine thread which I believe is pretty standard on end caps.
It is a uncommon thread type not the easiest to find and can be easily mistaken for metric fine to be sure check the T.P.I of it and cross reference it against a thread chart is your best bet but I’d bet it’s NF that was or ways the standard for them back in the day. But check the tpi I could be wrong
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