How much barrel needed for a front sight screw?

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29 October 2007, 07:05

ramrod340

How much barrel needed for a front sight screw?

I'm trying to decided between a sweated on vs screwed on front sight. How much metal thickness do I need for the screw on?

As usual just my $.02
Paul K

29 October 2007, 07:12

vapodog

I've tapped threads in win-70 featherweight barrels with .10 metal thickness.

I do it by dialing it in on the mill and drill the point to within .020 of thru.....I use two taps.... one is ground for true bottoming which gives me another two threads or so.....

That's about the thinnest barrel I've tapped.....it works fine however.

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29 October 2007, 09:59

Westpac

quote:
Originally posted by ramrod340:
I'm trying to decided between a sweated on vs screwed on front sight. How much metal thickness do I need for the screw on?

The rule I apply when drilling and tapping a barrel is minimum thread depth for a #6 screw is .120, and, absolute minimum distance between the bottom of the hole and the bore, .050. Anything less than this is just asking for trouble.

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29 October 2007, 18:35

ramrod340

Ok I missure .124" by measuring and removing the caliber and dividing by 2. So I would be safe with screws. If I want any thinner I should really go with a sweated on.

As usual just my $.02
Paul K