Thread size help.

garv123

Looking for help on finding out the thread size on a CZ 550 .243,

The gun was got second hand but not sure if it was factory threaded or not.
There is 8 threads on it, and from the top of the top thread to the bottom of the bottom thread is .5 of an inch.

thanks.

dev110

garv123 wrote: »

Looking for help on finding out the thread size on a CZ 550 .243,

The gun was got second hand but not sure if it was factory threaded or not.
There is 8 threads on it, and from the top of the top thread to the bottom of the bottom thread is .5 of an inch.

thanks.

What length are the 8 threads over?

garv123

dev110 wrote: »

What length are the 8 threads over?

half an inch? and to the barrel from the last thread then theres about 3mm, I dont know what 3mm is in inches,

dev110

Would this post be any help?

http://www.boards.ie/vbulletin/showpost.php?p=71603717&postcount=3

garv123

dev110 wrote: »

Would this post be any help?

http://www.boards.ie/vbulletin/showpost.php?p=71603717&postcount=3

Ah i see i which you were asking about. Il have to get him to check later on and find out. I i measured the length before leaving his house instead of the Thickness like you measured in the first post. Il check that out next time, thanks for the help.

Tackleberrywho

garv123 wrote: »

Looking for help on finding out the thread size on a CZ 550 .243,

The gun was got second hand but not sure if it was factory threaded or not.
There is 8 threads on it, and from the top of the top thread to the bottom of the bottom thread is .5 of an inch.

thanks.

I reckon 1/2" UNF for a standard profile barrel.

http://www.czub.cz/en/catalog/81-centerfire-rifles-cz/KM/CZ_550_LUX.aspx

If it is the same as above and was threaded after market.
Just get a thread feeler gauge out of the College Eng workshop.

garv123

Tackleberrywho wrote: »

I reckon 1/2" UNF for a standard profile barrel.

http://www.czub.cz/en/catalog/81-centerfire-rifles-cz/KM/CZ_550_LUX.aspx

If it is the same as above and was threaded after market.
Just get a thread feeler gauge out of the College Eng workshop.

Thats the very one with the iron sights removed.

Not in college till after xmas but im sure il rob one off someone
cheers

Cass

Tackleberrywho wrote: »

I reckon 1/2" UNF for a standard profile barrel..

Your standard 1/2" UNF has 20 threads per inch. Depends, as you said, if it was factory or after market.

garv123 wrote: »

There is 8 threads on it, and from the top of the top thread to the bottom of the bottom thread is .5 of an inch.

thanks.

Have a look down this chart. Gives all thread sizes, and dimensions. Yours seems to be 1/2" UNC going by thread count, etc.

Measure and remeasure the thread count, length then compare to the chart.