Smith & Wesson S&W K L N Frame Stainless Steel Strain Screw - ROUND Butt

$12.99
(2 reviews) Write a Review
Smith & Wesson S&W K L N Frame Stainless Steel Strain Screw - ROUND Butt
This is a brand new stainless steel strain screw for Smith & Wesson K, L, and N frame round-butt revolvers that use the flat-leaf type mainspring. Measures .505" OAL and .380" under the head.  Fits models:  64 ,65, 66, 67, 610, 617, 624, 625, 629, 648, 657, 681, 686, and maybe more.
 
I have the longer square-butt screws here.

2 Reviews Hide Reviews Show Reviews

  • 5
    S&W 686+ Mountain Gun

    Posted by Anthony on Nov 10th 2025

    The new 686+ ships with 0.334” (under the head) strain screw, this results in too light mainspring weight. This 0.380” (under the head) strain screw is perfect and puts the spring weight at a sufficient strength to eliminate light primer strikes, which is why I purchased this strain screw. I believe this is the correct spring weight which matches my older Smiths. I think S&W shortened the length to give a cheap trigger job rendering the revolver unreliable. Thankfully the Gun Garage had this part and provided an excellent description.

  • 5
    Screws are top notch

    Posted by Garry Archer on Jun 14th 2023

    Screws are top notch