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05-28-2021, 12:01 AM
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625 Strain screw length
I have a 625-8 that appears that the strain screw has been shortened, but I can't tell for sure or how much. Functions fine, no light strikes
Does anyone have a strain screw laying around that they would measure for me? I need the overall length and the length from the shoulder to the tip, please.
Thanks.
-Z-
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05-28-2021, 04:58 AM
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For a round butt or square butt?
Kevin
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05-28-2021, 07:43 AM
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Round butt .505" OAL and .380" under the head, Square butt .605" OAL and .480" under the head. Your Welcome
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05-28-2021, 01:46 PM
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Attached are photos of three mainspring screws for round butt and square butt applications. I'm not sure which models utilized the "thin head" screws. Lengths will sometimes vary a .002"-.004" or so.
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05-29-2021, 02:32 AM
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My round butt PC 625-8's strain screw measured .518"/.384" (OAL/body only).
.
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05-29-2021, 04:00 PM
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My thanks to all who took the time to respond, it helped me figure out what I have.
It works OK but it appears that my strain screw has been shortened. No problem but nice to know what's there.
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05-29-2021, 04:51 PM
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Quote:
Originally Posted by zonker5
My thanks to all who took the time to respond, it helped me figure out what I have.
It works OK but it appears that my strain screw has been shortened. No problem but nice to know what's there.
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Is the mainspring original or has it been swaped out with a Wolff spring with the rib that runs down the center of it?
If it has a Wolff spring, that rib recess make the stock screw too short, and the fix is to install a square butt screw.
When I bought my 986 pro series which comes with a Performance Center mainspring, I was curious about what the Performance Center spring looked like so I removed the side plate to take a peek.
Well, what was inside looked exactly like a Wolff reduced power main spring with the "power rib", and the strain screw... it was the longer square butt screw, so that's how I discovered the "secret".
When I decided to put a Wolf spring in my 625-8, I swapped in a square butt screw and it's been working like a champ, no light strike issues.
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Last edited by Gunhacker; 05-29-2021 at 04:53 PM.
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05-29-2021, 08:31 PM
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Until you get a new strain screw, put a spent primer over the end of the screw before you tighten it to flex the spring. You have just lengthened the screw the thickness of the primer.
Kevin
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05-30-2021, 08:53 PM
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The -8 comes with a ribbed mainspring stock. They have minimum length firing pin to pass drop tests.
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05-30-2021, 09:33 PM
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