Smith & Wesson J Frame Mainspring, Stirrup & Swivel .22 LR - Stainless Steel Used J63141

Genuine Smith & Wesson J Frame Mainspring Assembly for Model 63

Factory OEM mainspring assembly (also known as the hammer spring) designed for Smith & Wesson Model 63 .22 LR revolvers. This complete assembly includes the mainspring, stirrup, and swivel—critical components that provide the power for hammer operation in both single and double action modes.

Part Details:

• Part Number: J63141
• Condition: Used, excellent working condition
• Material: Stainless steel
• Frame Size: J Frame
• Includes: Mainspring, stirrup, and swivel
• Complete assembly ready for installation

Compatibility:

Fits Smith & Wesson Model 63 and other J Frame revolvers. Mainspring assemblies typically interchange within J Frame models regardless of caliber, making this suitable for various J Frame configurations including Models 34, 35, 36, 37, 38, 40, 42, 43, 49, 60, 63, 317, 331, 337, 340, 342, 351, 360, 442, 638, 640, 642, and 649.

Function & Performance:

The mainspring provides the force that drives the hammer forward to strike the firing pin. A properly functioning mainspring ensures reliable ignition and consistent trigger pull weight. Worn or weakened mainsprings can cause light primer strikes and misfires.

Installation:

Professional gunsmith installation recommended. Requires proper compression and alignment of the mainspring assembly. Improper installation can affect trigger pull weight and hammer function. Factory parts are manufactured to exact OEM specifications and tolerances.

How to Identify Your Model:

Swing out the cylinder and check behind the yoke on the frame for the model number. Model numbers began in 1957-58. If no model number is present, contact us with your serial number for assistance.

Authentic Smith & Wesson factory part for reliable restoration and repair of J Frame revolvers.