Smith & Wesson Model 686 L Frame Strain Screw Round Butt .357 Magnum, Part# 6861
$6.99
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Smith & Wesson Model 686 L Frame Strain Screw Round Butt .357 Magnum, Part# 6861
$6.99
Smith & Wesson Model 686 Strain Screw (Round Butt) – Part# 6861
This is a genuine factory Smith & Wesson strain screw for the L Frame Model 686 revolver with a round butt frame. An old-style used part in serviceable condition — a reliable, cost-effective option for restoring or maintaining your 686.
The strain screw controls mainspring tension, directly affecting trigger pull weight. Replacing a worn or damaged strain screw restores consistent hammer fall and reliable ignition.
Part Details
- Part Number: 6861
- Part Name: Strain Screw, Round Butt
- Material: Stainless Steel
- Condition: Used, factory original (old style)
- Frame: L Frame
Model Compatibility
| Model | Caliber | Frame | Butt Style | Compatible |
|---|---|---|---|---|
| Model 686 | .357 Magnum / .38 Special | L Frame | Round Butt | ✅ Yes |
| Model 686 Plus | .357 Magnum | L Frame | Round Butt | ⚠️ Verify fitment |
| Model 586 | .357 Magnum | L Frame | Round Butt | ⚠️ Verify fitment |
| Model 686 Square Butt | .357 Magnum | L Frame | Square Butt | ❌ Different butt style |
| Model 19 / 66 | .357 Magnum | K Frame | — | ❌ Different frame |
Note: Strain screws differ between round butt and square butt L Frame revolvers. Always confirm your frame configuration before ordering. Model numbers are stamped on the frame behind the yoke when the cylinder is swung out. Pre-1957 revolvers may not have a model number — contact us with your serial number for assistance.
Installation
Strain screw replacement is a straightforward armorer-level task but affects trigger function. If you are unfamiliar with revolver mainspring assemblies, we recommend installation by a qualified gunsmith.
Questions? Call or email us — we're happy to help confirm fitment for your specific revolver.