AlwaysArmed
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- Oct 17, 2015
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I keep hearing reports of the SW22 Victory takedown screw coming loose. In the world of fasteners such as socket head cap screws, the stretch of the fastener is what holds it fast (fast = fastener. Get it?).
Therefore, it stands to reason that if the fastener is coming loose, it has not or can not stretch.
Has not means it hasn't been stretched enough to hold it fast. Solution- Tighten the screw more. I'm going to 40 in./lbs. with my F.A.T. Wrench and I almost can't get the screw loose when I clean the pistol.
Can not means no matter how tight you torque the screw it will not hold its stretch. Allowing the screw to come loose. Solution- Find what is preventing the fastener from working properly.
After studying my pistol, I have a couple of items that may lead to the looseness of the cap screw in some guns. Let's see if we can find things wrong.
I would check two things first...
1- Make sure the shoulder of the socket head cap screw is flat and at a right angle to the threads of the screw. Check for contact marks across the face of the cap shoulder.
My camera doesn't make good close up pics but maybe you can see mine in the image of the cap screw here.
2- Make sure the surface that the shoulder of the cap screw sits against is flat and square. Look at the shoulder inside the hole where the takedown screw goes into and make sure it is flat and not rounded off. Mine has a matte finish like it has been bead blasted. I'd say if you have a shiny ring here there is improper contact with the screw and screw stretch (tightness) can't be achieved.
Just an idea. Hope this helps lead to a solution.
And a couple more things...
I believe this socket head cap screw is a #12 short head fastener. Very uncommon. The torque chart says it should be tightened to 65 in./lbs.
If you want to use blue Loctite on your screw (I don't recommend it) you must use primer on stainless steel.
I would also not recommend any lock washers or star washers. These things can not work until the screw comes loose and then the lock washer can dig in (aint gonna happen on stainless steel and a grade 8 screw). Think about it.
Therefore, it stands to reason that if the fastener is coming loose, it has not or can not stretch.
Has not means it hasn't been stretched enough to hold it fast. Solution- Tighten the screw more. I'm going to 40 in./lbs. with my F.A.T. Wrench and I almost can't get the screw loose when I clean the pistol.
Can not means no matter how tight you torque the screw it will not hold its stretch. Allowing the screw to come loose. Solution- Find what is preventing the fastener from working properly.
After studying my pistol, I have a couple of items that may lead to the looseness of the cap screw in some guns. Let's see if we can find things wrong.
I would check two things first...
1- Make sure the shoulder of the socket head cap screw is flat and at a right angle to the threads of the screw. Check for contact marks across the face of the cap shoulder.
My camera doesn't make good close up pics but maybe you can see mine in the image of the cap screw here.
2- Make sure the surface that the shoulder of the cap screw sits against is flat and square. Look at the shoulder inside the hole where the takedown screw goes into and make sure it is flat and not rounded off. Mine has a matte finish like it has been bead blasted. I'd say if you have a shiny ring here there is improper contact with the screw and screw stretch (tightness) can't be achieved.
Just an idea. Hope this helps lead to a solution.
And a couple more things...
I believe this socket head cap screw is a #12 short head fastener. Very uncommon. The torque chart says it should be tightened to 65 in./lbs.
If you want to use blue Loctite on your screw (I don't recommend it) you must use primer on stainless steel.
I would also not recommend any lock washers or star washers. These things can not work until the screw comes loose and then the lock washer can dig in (aint gonna happen on stainless steel and a grade 8 screw). Think about it.
