Base screws for Heym SR20?

[Club338]

Hi. Could anyone please tell me what the thread is for screws, which will be used to mount Weaver bases on an Heym SR20 7x64?

I am asking because I recently acquired this fine old caliber, but the screws accompagnying the rifle is too short to grip suffficiently into the base (lock ), so I have to acquire some new ones.

Thanks in advance,
Tommy
Denmark.

 

[Heym SR20]

Have a look in the Recknagel Catalogue.

 

[Club338]

Have a look in the Recknagel Catalogue.

Yes, they have many screws for base mounting. Unfortunately, I can not see which type I actually need for the Heym.
Thanks anyway.

 

[Heym SR20]

Yes, they have many screws for base mounting. Unfortunately, I can not see which type I actually need for the Heym.
Thanks anyway.

Have you a pair of calipers and measure the screws you take out - what diameter are they. Then measure depth of the screw holes plus the bases and that will be the length. They will almost certainly be a metric 3mm or 3.5mm thread.

A Heym SR20 in 7x64 is a very lovely thing

 

[HonestJohn]

They’re 6-48’s.

 

[Klenchblaize]

Be prepared to file down the length of the new screws. You don't want them bottoming out on the front (chamber) threads or locking up the bolt c/o the rear ones!

K

 

[HonestJohn]

Did the weaver bases not come with new 6-48 screws? They usually do

 

[Club338]

Did the weaver bases not come with new 6-48 screws? They usually do

Yes, but the I think the previous owner has replaced the screws.
Because they are really short and can only hold on to the thread in the hole with a depth into the hole of max 1mm.
I have a strong feeling they are M3.5, but I am not sure.

 

[Club338]

Be prepared to file down the length of the new screws. You don't want them bottoming out on the front (chamber) threads or locking up the bolt c/o the rear ones!

K

Yes, I am aware of that. Thanks

 

[Heym SR20]

Yes, I am aware of that. Thanks

Your best bet is to go to a good gunsmith that should have a good selection of screws and then find a set that fit well.

 

[Club338]

I ordered some M3,5 x 14 mm. £6 delivered so not too expensive.
And they fitted nicely - I just have to adapt the length carefully.
Thanks for your comments.

 

[Essexsussex]

I ordered some M3,5 x 14 mm. £6 delivered so not too expensive.
And they fitted nicely - I just have to adapt the length carefully.
Thanks for your comments.

Hi I don’t suppose you know where there is a rear open sight for an sr20?
Thank you

 

[Club338]

Hi I don’t suppose you know where there is a rear open sight for an sr20?
Thank you

I am sorry - I do not. FYI: My rear sight is foldable. I do not know, whether this is default.

 

[Essexsussex]

I am sorry - I do not. FYI: My rear sight is foldable. I do not know, whether this is default.

Thank you. I’ve seen fixed and foldable, foldable is what im after

 

[robinpeck]

In Canada, you can buy hexagonal socket head guard screws for the Heym SR20 at your local hardware store or any Japanese motorcycle dealer. File to fit.