STIHL OEM 20-inch ST chainsaw guide bar part number 3003-008-6821 on white background

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STIHL 20 Inch Chainsaw Bar Guide ST OEM Replacement Part 3003-008-6821

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20" ST Guide Bar — OEM Replacement Part 3003-008-6821
STIHL 3003-008-6821 — 20-Inch ST Chainsaw Guide Bar
Also known as: 20 inch bar, ST bar, STIHL guide bar, chainsaw sword, bar and chain guide
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Specifications
Specification Detail
Part Number 3003-008-6821
Brand STIHL
Bar Length 20 Inches (50 cm)
Bar Type ST (Standard)
Part Type Guide Bar / Chainsaw Bar
OEM / Aftermarket Genuine OEM

The STIHL 3003-008-6821 is a genuine OEM 20-inch ST guide bar, also commonly referred to as a chainsaw bar, guide sword, or cutting bar, designed as a direct replacement for select STIHL chainsaw models. This bar provides the rigid, precision-milled guide track that keeps the saw chain in proper alignment throughout the cutting stroke, making it essential for safe and efficient timber felling, limbing, and bucking operations. As a factory-original component, it meets the exact tolerances and material specifications set by STIHL, ensuring reliable performance and proper chain fit without modification.

Key Features▼
STIHL OEM 20-Inch ST Guide Bar Specs

The STIHL 3003-008-6821 is a 20-inch ST-type guide bar manufactured to OEM specifications. The ST designation indicates a standard-profile bar engineered for the power output range of mid-class and professional STIHL chainsaw models, offering the correct pitch, gauge, and drive link slot alignment for factory-approved chain fitment.

Best Uses for a 20-Inch STIHL Chainsaw Bar

A 20-inch chainsaw guide bar is well suited for felling medium to large-diameter trees, bucking logs, and heavy limbing tasks. Part 3003-008-6821 provides the reach needed for productive cutting on hardwoods and softwoods alike, making it a practical choice for both landowners and professional arborists using compatible STIHL saws.

Genuine STIHL OEM Part vs Aftermarket Bar

Unlike third-party bars, the STIHL 3003-008-6821 is a factory-original replacement part produced to the same standards as the bar that shipped with your saw. Using a genuine OEM bar ensures correct chain tension behavior, proper oiler port alignment, and consistent sprocket nose engagement — reducing wear on both the bar and chain.

Compatible STIHL Chainsaw Models for Part 3003-008-6821

Part number 3003-008-6821 is designed to fit specific STIHL chainsaw models that accept a 20-inch ST guide bar. Always verify your saw's bar mount, sprocket pitch, and gauge requirements against the bar specifications before installation to ensure full compatibility and safe operation.

Compatible Equipment▼

STIHL guide bar part 3003-008-6821 is a 20-inch ST bar engineered to fit compatible STIHL chainsaw models that require this bar length and bar type. Typical STIHL models that may use a 20-inch ST guide bar matching part 3003-008-6821 include mid-range and professional-grade saws such as the MS 271, MS 291, MS 311, MS 391, and MS 362, among others sharing the same mount specifications. Always confirm your specific model's bar requirements before ordering.

Models that may be compatible with STIHL 3003-008-6821 include the MS 271, MS 291, MS 311, MS 391, and MS 362, all of which commonly accept a 20-inch guide bar in the ST configuration. Verify pitch, gauge, and drive link count for your specific unit.

  • STIHL MS 271
  • STIHL MS 291
  • STIHL MS 311
  • STIHL MS 391
  • STIHL MS 362
Common Questions▼

Q: What is STIHL part number 3003-008-6821?

A: STIHL 3003-008-6821 is a genuine OEM 20-inch ST guide bar, also called a chainsaw bar or cutting bar, used as a direct replacement on compatible STIHL chainsaw models that require this bar length and profile.

Q: Will a 20-inch STIHL ST bar fit my MS 271 or MS 291?

A: The STIHL MS 271 and MS 291 are among the common models that accept a 20-inch guide bar. However, you should verify the exact bar mount type, chain pitch, and gauge required for your specific saw before installing part 3003-008-6821 to ensure proper fit and safe operation.

Q: Is the STIHL 3003-008-6821 bar a genuine OEM part or aftermarket?

A: Part 3003-008-6821 is a genuine OEM STIHL guide bar, manufactured to factory specifications. It is not an aftermarket or third-party reproduction, which means it delivers the precise fit, oil port alignment, and chain groove dimensions required for safe and efficient operation on compatible STIHL saws.

Q: How do I know when to replace my STIHL chainsaw guide bar?

A: You should replace your STIHL guide bar when you notice the bar rails are pinched or uneven, the bar groove is excessively worn causing chain wobble, the sprocket nose does not spin freely, or the bar is bent or cracked. Replacing a worn bar with a genuine STIHL part like 3003-008-6821 restores cutting accuracy and extends chain life.

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