STIHL 18 inch guide bar part number 3003 812 6817 shown on white background

Stihl

STIHL 18 Inch Chainsaw Bar Guide Bar Part 3003 812 6817 | OEM Replacement Part

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18" Chainsaw Guide Bar
Part No. 3003 812 6817
STIHL 3003 812 6817 — 18" Chainsaw Guide Bar
Also known as: STIHL 18-inch bar, 18" guide bar, bar ST, STIHL chainsaw bar replacement
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Specifications
Specification Detail
Part Number 3003 812 6817
Brand STIHL
Bar Length 18 Inches (45 cm)
Part Type Chainsaw Guide Bar (Bar ST)
OEM / Aftermarket Genuine OEM STIHL
The STIHL 3003 812 6817 is a genuine OEM STIHL 18-inch chainsaw guide bar designed to guide and support the cutting chain during operation. Also referred to as an 18" bar, bar ST, or chainsaw sword, this guide bar is a direct-fit replacement part for compatible STIHL chainsaw models. It maintains the precise tolerances required for safe, efficient cutting performance in both professional and homeowner applications.
Key Features▼
18-Inch Bar Length for Mid-Range Cutting
The 18-inch (45 cm) cutting length of part 3003 812 6817 is ideal for felling small to medium trees, limbing, and bucking firewood. This bar length offers a balance of maneuverability and reach for common chainsaw tasks.
STIHL OEM Replacement Guide Bar
As a genuine OEM STIHL part, 3003 812 6817 is manufactured to the exact factory specifications required for safe chainsaw operation. OEM bars ensure proper chain tension, correct gauge fit, and factory-tested durability.
Direct Cross-Reference for STIHL Bar Replacement
STIHL part number 3003 812 6817 cross-references to the Bar ST designation used across several STIHL chainsaw lineups. Always verify chain gauge, pitch, and drive link count when ordering a replacement guide bar.
Compatible with Multiple STIHL Chainsaw Models
This 18-inch STIHL guide bar is designed to fit a range of STIHL gas-powered chainsaws that accept an 18" bar. Confirm compatibility using your saw's model number and bar mounting specifications before installation.
Compatible Equipment▼

STIHL part 3003 812 6817 is an 18-inch guide bar compatible with select STIHL chainsaws that accept this bar length and mounting style. Typical compatible models using the STIHL 18" bar include the MS 251, MS 271, MS 291, MS 311, and MS 391, among others — always verify with your saw's documentation.

  • STIHL MS 251
  • STIHL MS 271
  • STIHL MS 291
  • STIHL MS 311
  • STIHL MS 391
  • Other STIHL models accepting an 18" guide bar — confirm with model documentation
Common Questions▼
Q: What chainsaw models fit the STIHL 18 inch guide bar 3003 812 6817?
A: STIHL part 3003 812 6817 is designed to fit compatible STIHL chainsaws that accept an 18-inch guide bar, including commonly the MS 251, MS 271, MS 291, MS 311, and MS 391. Always cross-check your model's bar specifications before purchasing.
Q: Is STIHL part 3003 812 6817 a genuine OEM bar or aftermarket?
A: Yes, STIHL 3003 812 6817 is a genuine OEM part manufactured by STIHL to factory specifications. It is not an aftermarket or third-party bar, ensuring correct fit, gauge, and safety performance.
Q: What does Bar ST mean on a STIHL chainsaw guide bar?
A: Bar ST is STIHL's designation for a specific style of chainsaw guide bar in their product lineup. The Bar ST series, including part 3003 812 6817, refers to the bar type and nose profile used across compatible STIHL chainsaw models.
Q: How do I know when to replace my STIHL chainsaw guide bar?
A: Replace your STIHL guide bar, such as part 3003 812 6817, when you notice uneven wear on the rail grooves, bar bending or warping, chain derailment, or difficulty maintaining proper chain tension. Replacing a worn bar ensures safe and efficient cutting performance.
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