Restore max power transfer, crisp clutch engagement, and high-speed cutting performance to your extreme-displacement chainsaw with the Genuine OEM STIHL 3/8" 8-Tooth Spur Sprocket Drum Kit (Part #1124 640 2004). Designed as a solid, direct-fit replacement, this heavy-duty steel drum assembly swaps out grooved, worn, or heat-damaged drive components—stopping chain chatter, drive link burring, and clutch slippage instantly.
Why Choose Genuine OEM over Aftermarket? Monster 100cc+ powerhouses like the 084, 088, and MS 880 generate immense rotational torque and high RPMs that destroy sub-standard drive parts. Cheap aftermarket spur drums frequently suffer from out-of-round machining, soft metal drive teeth that groove rapidly, and improper drum wall tolerances that destroy clutch pads. STIHL OEM assemblies guarantee exact dynamic balance, precise needle bearing fitment, and long-lasting commercial durability.
What's Included
- (1) Heavy-Duty Clutch Drum with Integrated Fixed Spur Sprocket
- (1) Precision Clutch Washer
- (1) Factory E-Clip Retaining Ring
Key Features
- 100% Genuine OEM STIHL Quality: Built to exact factory specifications using high-density, heat-treated structural steel alloys to guarantee maximum service life under extreme cutting loads.
- High-Speed 3/8" Pitch 8-Tooth Gearing: The larger 8-tooth profile increases chain speed for rapid bucking, cross-cutting, and high-production timber processing on massive engines.
- Induction-Hardened Steel Drive Teeth: Precision-ground teeth resist premature grooving to keep chain drive links meshing smoothly and safely.
- Integral One-Piece Drum Design: Combines the clutch drum and drive spur into a single rigid unit for simple, drop-in replacement during routine maintenance.
- Complete Replacement Hardware: Includes required drive line washer and retaining clip to ensure a fast, reliable installation.
Product Specifications & Compatibility
| Brand / Tier | STIHL® Genuine OEM Component Kit |
| Part Number / SKU | 1124 640 2004 (1124-640-2004 / 11246402004) |
| Chain Pitch / Teeth | 3/8" Standard Pitch | 8-Tooth (8T) Fixed Spur |
| System Design | One-Piece Clutch Drum with Integrated Fixed Drive Spur |
| Kit Contents | Clutch Drum w/ Fixed Spur Sprocket, Clutch Washer, E-Clip |
| Verified Compatible Models | • 084 Series: 084, 084 R, 084 W, 084 RW • 088 Series: 088, 088 R • MS 880 Series: MS 880, MS 880-R |
| Note | Needle bearing sold separately. Always inspect bearing during replacement. |
