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[Lifetime Warranty] 3/8" 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear - Compatible with Stihl 017 018 021 023 MS170 MS180 MS210 MS230 MS250 Chainsaw - Replaces 1123 640 2003, 1123 640 2073

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[Lifetime Warranty] 3/8" 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear - Compatible with Stihl 017 018 021 023 MS170 MS180 MS210 MS230 MS250 Chainsaw - Replaces 1123 640 2003, 1123 640 2073

[Lifetime Warranty] 3/8" 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear - Compatible with Stihl 017 018 021 023 MS170 MS180 MS210 MS230 MS250 Chainsaw - Replaces 1123 640 2003, 1123 640 2073

3/8 7T Clutch Drum Sprocket with Bearing3/8 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear

Key Features

  • Sprocket Pitch: 3/8 inch
  • Sprocket Tooth Count: 7
  • Material: High-strength metal alloy construction
  • Complete assembly kit for chainsaw clutch and oil pump drive
  • Includes: 1x Clutch Drum Sprocket, 1x Needle Bearing, 1x Clutch Washer, 1x E-Clip, 1x Worm Gear

Replaces / Cross-Reference Part Numbers

  • 1123 640 2003
  • 1123-640-2003

Compatibility & Fitment

  • Designed for specific Stihl chainsaw models.
  • Fits Stihl: 017, 018, 021, 023, 025
  • Fits Stihl: MS 170, MS 180, MS 210, MS 230, MS 250
  • Note: Always verify part number and model to ensure correct fitment.

When to Replace

  • Visible wear, grooving, or damage on the sprocket teeth
  • Chain slips, binds, or derails frequently
  • Grinding or abnormal noise from the clutch housing
  • Chain continues to spin at idle

Installation Tips

  • Disconnect spark plug wire before beginning service.
  • Use a piston stop tool to prevent engine rotation during clutch removal.
  • Clean all components and the clutch housing area before installing new parts.
  • Lightly grease the needle bearing before installation.
  • Ensure the E-clip is properly and securely seated in its groove.
$7.16

Original: $20.47

-65%
[Lifetime Warranty] 3/8" 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear - Compatible with Stihl 017 018 021 023 MS170 MS180 MS210 MS230 MS250 Chainsaw - Replaces 1123 640 2003, 1123 640 2073—

$20.47

$7.16

Product Information

Shipping & Returns

Description

3/8 7T Clutch Drum Sprocket with Bearing3/8 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear

Key Features

  • Sprocket Pitch: 3/8 inch
  • Sprocket Tooth Count: 7
  • Material: High-strength metal alloy construction
  • Complete assembly kit for chainsaw clutch and oil pump drive
  • Includes: 1x Clutch Drum Sprocket, 1x Needle Bearing, 1x Clutch Washer, 1x E-Clip, 1x Worm Gear

Replaces / Cross-Reference Part Numbers

  • 1123 640 2003
  • 1123-640-2003

Compatibility & Fitment

  • Designed for specific Stihl chainsaw models.
  • Fits Stihl: 017, 018, 021, 023, 025
  • Fits Stihl: MS 170, MS 180, MS 210, MS 230, MS 250
  • Note: Always verify part number and model to ensure correct fitment.

When to Replace

  • Visible wear, grooving, or damage on the sprocket teeth
  • Chain slips, binds, or derails frequently
  • Grinding or abnormal noise from the clutch housing
  • Chain continues to spin at idle

Installation Tips

  • Disconnect spark plug wire before beginning service.
  • Use a piston stop tool to prevent engine rotation during clutch removal.
  • Clean all components and the clutch housing area before installing new parts.
  • Lightly grease the needle bearing before installation.
  • Ensure the E-clip is properly and securely seated in its groove.
[Lifetime Warranty] 3/8" 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear - Compatible with Stihl 017 018 021 023 MS170 MS180 MS210 MS230 MS250 Chainsaw - Replaces 1123 640 2003, 1123 640 2073 | BlueStars Quality Replacement Parts