View Full Version : Who knows about roll pins?
01-16-2011, 02:02 PM
OK, so messing around in Home Depot the other day I went by where they have the roll pins in the hardware section. I know these are usually used as safety shear pins to keep more expensive stuff from breaking under load. Further, I remember reading somewhere you can install one pin inside another to increase strength. This got me to thinking. I couldn't come up with a reason why they couldn't be a part of an AK build if they were properly sized. Has anyone ever messed with using roll pins to pin stuff together (like barrel components, etc) instead of dowel pins? Experiences? Results? Problems?
01-16-2011, 04:34 PM
Back in the late 80's I bought an ar15 barrel that had the front sight tower held on by two roll pins instead of the normal two taper pins. I had a really hard time sighting that gun in and maintaining a zero until I realized that the front sight/gas block would move side to side slightly if you bumped it. I ended up replacing them with the proper taper pin. If I were to use the roll pins I would try the ones made like a spiral and not the ones like a "C". I would never use one as a barrel pin in the trunion.
01-16-2011, 08:36 PM
I've used a 5/16 x 1 1/4 inch roll pin as a spacer/stiffener inside my AK receiver. A long rivit goes through the receiver and through the roll pin.
01-16-2011, 09:01 PM
You mean you're using it as the center support?
01-17-2011, 12:09 AM
Yes, that's it !!!
01-17-2011, 12:48 AM
I wouldn't use then as a barrel pin, to hold it to the trunnion, but they would work for the other things on the barrel.
01-17-2011, 10:58 AM
Well put-it made sense to me that way too. Coils and moleman seem spot on about the barrel pin. Some things shouldn't be messed with.
01-17-2011, 06:53 PM
Agreed, not for the barrel pin.
HK uses roll pins on their newer rifles for all the barrel components... no problems there.
01-17-2011, 07:56 PM
If your press fits are tight enough then yeah, you probably won't have problems, but if the press fits are nice and loose then you'll want solid pins. The gas block also has a substantial shock load from the recoil of the gas slamming the bolt carrier rearwards, so I'd pin that with solid pins either way...
I use roll pins in the place of the gas piston rivet though. But I also tighten the piston all the way down whereas some leave it loose...
01-17-2011, 09:11 PM
All the gas piston pin does is keep it from unscrewing, I use dead soft shanks from broken dremel grinding stones. Never had one come out yet or shear off.
01-18-2011, 11:38 AM
You know now that I recall, my Galil kit used a roll pin for its piston.
Valmets used roll pins for everything except the barrel, according to the printed Valmet manuals I have.
01-19-2011, 02:25 PM
Hollow center pins are spring pins, rolled pins are made from rolled sheet metal are not hollow in the center.