Oregon Power Mate® Rim Sprocket System - 3/8" x 7 Tooth (Standard Spline)
The Oregon 26831XSF is a professional-grade two-piece drive system designed for high-performance chainsaws. By utilizing a free-floating rim on a splined drum, this system allows the chain to self-align with the guide bar's groove, resulting in reduced friction, smoother cutting, and significantly less chain wear compared to standard spur sprockets.
Cold-Forged Durability
Built using Oregon's cold-forged manufacturing process, this sprocket offers superior strength and heat resistance. The modular design is highly economical; because the rim is the only part that contacts the chain, it can be replaced multiple times before the entire drum unit needs service.
Product Specifications:
| Part Number | 26831XSF (26831X) |
| Pitch / Tooth Count | 3/8" Pitch / 7 Tooth |
| Spline Size | Standard 7 Spline (SD7) |
| Replaces OEM | Husqvarna 501 83 15-04 |
Model Fit Guide:
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Husqvarna: 61, 266, 268, 272
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Jonsered: 625, 630, 630 Super, 630 West Coast, 670
⚠️ Critical Fitment Note:
The pitch of your sprocket, saw chain, and bar tip must all match. This system is for 3/8" pitch only. Additionally, ensure your crankshaft diameter is 0.500" (1/2") for proper compatibility.
⚙️ Related Parts & Maintenance:
🛠️ Mechanic's Tip:
One sprocket drum will typically last for the complete life of two chains, provided the rims are maintained. For peak performance and to prevent crankshaft damage, Oregon recommends replacing the rim every three chains and greasing the needle bearing (H131613) every time the drum is removed.