Smith & Wesson K Frame Strain Screw Square Butt Blue Steel Old Style Used - 10173C
$8.99
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Smith & Wesson K Frame Strain Screw Square Butt Blue Steel Old Style Used - 10173C
$8.99
Smith & Wesson K Frame Strain Screw – Square Butt, Blue Steel, Old Style
Genuine factory Smith & Wesson OEM strain screw for K Frame revolvers with square butt grip frames. This used blue steel screw threads into the bottom of the grip frame to secure the mainspring (hammer spring) and allows for trigger pull adjustment. Part number 10173C.
Specifications
- Part Number: 10173C
- Frame Size: K Frame
- Grip Type: Square butt
- Finish: Blue steel
- Style: Old style
- Caliber: .38 Special
- Condition: Used, functional
- OEM: Authentic Smith & Wesson factory part
Model Compatibility
| Model | Frame | Caliber | Grip Style | Compatible |
|---|---|---|---|---|
| Model 10-10 | K Frame | .38 Special | Square Butt | ✅ Yes |
| Model 10 (all variants) | K Frame | .38 Special | Square Butt | ✅ Yes |
| Model 64 | K Frame | .38 Special | Square Butt | ✅ Yes |
| Model 65 | K Frame | .357 Magnum | Square Butt | ✅ Yes |
| Model 13 | K Frame | .357 Magnum | Square Butt | ✅ Yes |
| Model 19 | K Frame | .357 Magnum | Square Butt | ✅ Yes |
| Model 66 | K Frame | .357 Magnum | Square Butt | ✅ Yes |
| Model 14 | K Frame | .38 Special | Square Butt | ✅ Yes |
| Model 15 | K Frame | .38 Special | Square Butt | ✅ Yes |
| Model 16 | K Frame | .32 S&W Long | Square Butt | ✅ Yes |
| K Frame Round Butt models | K Frame | Various | Round Butt | ❌ No |
| J Frame models | J Frame | Various | — | ❌ No |
| L Frame models | L Frame | Various | — | ❌ No |
| N Frame models | N Frame | Various | — | ❌ No |
Function
The strain screw threads into the bottom of the grip frame to secure the mainspring (hammer spring) in place. It also allows for trigger pull adjustment — turning the screw in or out changes tension on the mainspring, affecting trigger pull weight and hammer strike force. Proper adjustment ensures reliable ignition while maintaining a comfortable trigger pull.
Installation Note
Can be installed by the owner with basic tools. Access through the bottom of the grip frame after removing grips. Proper adjustment is important — too loose may cause light primer strikes; too tight may cause excessive trigger pull weight.
Authentic Smith & Wesson factory part — manufactured to exact OEM specifications and tolerances.