S&W K Model 10-7 Square Butt Strain Screw Nickel Plated .38 Special ctg., Part 10173

Smith & Wesson K Frame Model 10-7 Square Butt Strain Screw — Nickel Plated

Part #10173 | Used OEM Factory Part | .38 Special

• Fits: S&W K Frame Model 10-7, Square Butt configuration
• Finish: Nickel Plated
• Caliber: .38 Special
• Condition: Used — original Smith & Wesson factory part
• Frame Size: K Frame

The strain screw is located in the grip frame and controls mainspring tension, directly affecting trigger pull weight. Replacing a worn or damaged strain screw restores proper trigger function and consistent ignition.

Installation Note: Disassembly and reassembly required. Some fitting by a qualified gunsmith may be necessary.

How to Identify Your S&W Model Number

Swing out the cylinder and check behind the yoke on the frame. Model numbers were introduced in 1957–58. If no model number is present, your revolver may pre-date that era — contact us with your serial number and we can help identify the correct part.

We specialize in new, used, and new-old-stock Smith & Wesson double-action revolver parts. Contact us for any S&W parts needs.