Smith & Wesson K Frame Center Pin Spring Rimfire Models 17 18 617 647 648 - 054580000

Smith & Wesson K Frame Center Pin Spring - Part #054580000

Factory OEM center pin spring designed specifically for K Frame rimfire revolvers. This critical spring retains the cylinder center pin, ensuring proper cylinder operation and reliable lockup.

Compatible K Frame Rimfire Models:

• Model 17 (.22 LR) - 1957-present (K-22 Masterpiece)
• Model 18 (.22 LR) - 1957-1985 (Combat Masterpiece)
• Model 617 (.22 LR) - 1990-present (stainless steel)
• Model 647 (.17 HMR) - 2003-2004 (stainless steel)
• Model 648 (.22 WMR) - 1990-1996, 2003-2005 (stainless steel)

Important Rimfire Specification:

This center pin spring is designed specifically for K Frame rimfire revolvers only. All models listed above are .22 caliber rimfire variants (.22 LR, .22 WMR, .17 HMR) of the K Frame platform. This part is NOT compatible with centerfire K Frame models (10, 12, 13, 14, 15, 16, 19, 64, 65, 66, 67).

Key Features:

• Factory new OEM component - authentic Smith & Wesson quality
• Precision spring steel construction for consistent retention
• Essential for proper cylinder swing-out and lockup
• Direct replacement part - fits rimfire K Frame models listed above
• Ensures smooth cylinder operation

Function:

The center pin spring retains the cylinder center pin in place, which secures the cylinder to the crane (yoke) assembly. It ensures proper cylinder alignment, smooth rotation, and reliable lockup. Replace if worn or if experiencing cylinder retention issues.

Installation:

Gunsmith installation recommended - requires disassembly and reassembly of cylinder crane mechanism.

Need Help Identifying Your Model?

Swing out the cylinder and check behind the yoke on the frame for a model number. Model numbers began in 1957-58. Contact us with your serial number and we can help identify the correct parts.

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