Smith & Wesson J Frame Pre-Model 36 Bolt, Spring & Plunger Assembly - Flat Latch .38 Special P3645A

Smith & Wesson Pre-Model 36 Bolt, Spring & Plunger Assembly

Genuine Smith & Wesson factory bolt assembly for Pre-Model 36 J Frame revolvers with flat latch configuration. This complete assembly includes the bolt (cylinder stop), spring, and plunger—three critical components that work together to ensure consistent cylinder indexing and reliable lockup. The bolt locks the cylinder in perfect alignment with the barrel at the moment of firing, essential for accuracy and safety.

Key Features:

• Factory S&W bolt assembly in used condition
• Complete assembly: bolt, spring, and plunger
• Flat latch configuration only
• Ensures proper cylinder indexing and lockup
• Critical timing component for reliable operation
• Old style vintage part
• Ideal for restoration or replacement projects

Compatibility:

Designed specifically for Smith & Wesson J Frame Pre-Model 36 revolvers with flat latch configuration chambered in .38 Special. Pre-Model revolvers were manufactured before 1957-58 when Smith & Wesson began using model numbers. This bolt assembly is for flat latch models only and will not fit round latch configurations.

Important Note: This assembly is for flat latch Pre-Model 36 revolvers only. It will NOT fit round latch models or numbered Model 36 revolvers, which use different bolt configurations.

Installation Notes:

Professional gunsmith installation and fitting required. The bolt assembly is a critical timing component that must be properly installed and adjusted to ensure the cylinder locks up correctly at the moment of firing. Proper installation requires complete disassembly of the revolver's action and precise fitting to ensure correct timing, engagement, and cylinder gap. Only a qualified gunsmith should install this component.

Specifications:

• Part Number: P3645A
• Model: Pre-Model 36 (Pre-1957)
• Frame Size: J Frame (Small Frame)
• Latch Type: Flat Latch Only
• Caliber: .38 Special
• Part Type: Bolt Assembly (Cylinder Stop, Spring & Plunger)
• Style: Old Style
• Condition: Used
• Manufacturer: Smith & Wesson

About the Bolt Assembly:

The bolt (also called the cylinder stop) is one of the most important timing components in a revolver. It pops up through the frame to engage notches in the cylinder, locking it in perfect alignment with the barrel at the moment of firing. The spring provides the force to raise the bolt, while the plunger helps control its movement. Proper bolt function is essential for accuracy, safety, and preventing cylinder endshake.

About Pre-Model Revolvers:

Before 1957-58, Smith & Wesson revolvers were not assigned model numbers. These "Pre-Model" revolvers are identified by their caliber and frame size. The Pre-Model 36 is the predecessor to the numbered Model 36 Chief's Special. Pre-Model revolvers are highly collectible and require period-correct parts for authentic restoration.