Smith & Wesson K Frame Model 10 Strain Screw Square Butt Blue Steel .38 Special – Part# 10173

Smith & Wesson K Frame Model 10 Strain Screw – Square Butt | Blue Steel | .38 Special

Part# 10173 | Used OEM Factory Part | Old Style | Blue Steel

Model Compatibility

Also compatible with other K Frame square butt models.

Part Details

• Part Type: Strain Screw
• Grip Type: Square Butt
• Finish: Blue Steel
• Style: Old Style
• Condition: Used – OEM Smith & Wesson factory part
• Fits: K Frame revolvers – Model 10 (.38 Special), square butt grip frame

Function

The strain screw threads into the bottom of the grip frame to secure the mainspring (hammer spring). It also allows for trigger pull adjustment — turning the screw in or out changes mainspring tension, affecting trigger pull weight and hammer strike force. Proper adjustment ensures reliable ignition with a comfortable trigger pull.

Installation

Can be installed by the owner with basic tools after removing grips. Note: Too loose may cause light primer strikes; too tight may result in excessive trigger pull weight. A qualified gunsmith is recommended for final adjustment. Factory replacement parts are manufactured to exact OEM specifications and tolerances.

How to Identify Your S&W Model Number

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

Questions? Call or email us — we're happy to help!