Smith & Wesson K Frame Main Spring Old Style Used 64141B

Smith & Wesson K Frame Main Spring - Old Style Design

Factory OEM main spring (also called mainspring or hammer spring) for Smith & Wesson K Frame revolvers. This critical component provides the power needed to drive the hammer forward and ignite the primer, ensuring reliable ignition with every trigger pull.

Specifications:

• Frame: K Frame
• Design: Old Style
• Type: Coil main spring
• Condition: Used, factory original

Compatible Models:

Fits all K Frame revolvers including Models 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 48, 53, 64, 65, 66, 67, 617, 648, K22 and other K Frame variants. The main spring is interchangeable between both centerfire and rimfire K Frame models.

Function:

The main spring (hammer spring) is compressed when the hammer is cocked and releases its stored energy to drive the hammer forward when the trigger is pulled. Proper main spring tension is essential for reliable primer ignition and consistent trigger pull weight. A worn or weakened main spring can cause light primer strikes and misfires.

Installation Note:

Installation requires disassembly of the revolver and removal of the grip panels and sideplate. The main spring is retained by the strain screw, which allows for adjustment of hammer spring tension.

Note: This is a genuine Smith & Wesson factory part in used condition. Compatible with all K Frame models regardless of caliber (centerfire or rimfire).