Smith & Wesson K Frame Strain Screw - Square Butt - Factory OEM 05064B000

This listing is for the strain screw only.

Genuine Smith & Wesson factory OEM strain screw for K Frame revolvers with square butt grips. The strain screw is a critical internal component that secures the mainspring in the grip frame, directly affecting trigger pull weight and reliability. Reducing the number of turns increases trigger pull; adding turns lightens it — a common tuning technique for K Frame revolvers.

Specifications:

• Part Number: 05064B000
• Frame: K Frame
• Grip Style: Square Butt
• Finish: Blue Steel
• Condition: Factory New OEM

Model Compatibility:

Fits all Smith & Wesson K Frame square butt models, including but not limited to:

• Model 10 (.38 Special)
• Model 13 (.357 Magnum)
• Model 14 (.38 Special)
• Model 15 (.38 Special)
• Model 17 (.22 LR)
• Model 18 (.22 LR)
• Model 19 (.357 Magnum)
• Model 48 (.22 WMR)
• Model 64 (.38 Special)
• Model 65 (.357 Magnum)
• Model 66 (.357 Magnum)
• Model 67 (.38 Special)
• Model 617 (.22 LR)

Note: Not compatible with K Frame round butt models. If you are unsure whether your revolver has a square or round butt grip frame, check the grip frame shape at the bottom — square butt frames have a flat, squared-off base.

We specialize in new, used, and new old stock Smith & Wesson double action revolver parts. Questions about compatibility? Shoot us an email or give us a call — we're happy to help.