STIHL Chain Sprocket 3/8"P - 1148 640 2001

The STIHL 1148 640 2001 is a direct-replacement nose sprocket engineered for 3/8-inch low-profile chain drives, supplying precise angular feedback and regulated rotational mass to maintain cutting efficiency and reduce drivetrain wear. This component interfaces directly with original crankshaft pilot bores to eliminate guide bar runout and restore factory-calibrated chain tension geometry.

Key Features

• Precision-molded outer diameter matched to 3/8" P pitch chain roller width specifications
• Multispline drive hub centers the guide bar on the crankshaft pilot to suppress harmonic vibration
• Through-hardened steel construction resists abrasive wood particulate and sustained chain tensile loads
• Factory-aligned oil passage positioning supports consistent lubrication delivery from standard STIHL pump configurations

Product Details

• Component classification: Guide bar nose sprocket
• Chain pitch specification: 3/8" Low Profile (P)
• Mounting configuration: Standard multispline crankshaft interface
• Manufacturer part number: 1148 640 2001
• Surface treatment: Corrosion-resistant coating over heat-treated substrates

Compatibility

• STIHL MS 170, MS 180, MS 181
• STIHL MS 200, MS 210, MS 220
• STIHL MS 230, MS 250, MS 270, MS 290
• STIHL MSA 120 C-BQ, MSA 140, MSA 200
• STIHL MSO 200, MSO 220