Stihl 3689-005-0074 OEM Chainsaw Chain (26RM3 • 18")

Genuine Stihl OEM Rapid Micro chain built for Farm Boss® and Wood Boss® class saws running a .325 pitch, .063 gauge setup. This is the factory-correct 26RM3 chain loop — not aftermarket — sold by P&P Small Engines.

Product Overview

• Brand: Stihl (OEM)

• Stihl Part Number: 3689-005-0074

• Chain Model: 26RM3 (Rapid Micro)

• Bar Length: 18 inch

• Pitch: .325" (8.35 mm)

• Gauge: .063" (1.6 mm)

• Drive Links: 74

• Cutter Type: Rapid Micro (semi-chisel)

• Stock Number: 36890050074

• Condition: New OEM

This is the exact OEM chain specified by Stihl for saws equipped with an 18" .325 pitch .063 gauge guide bar.

Verify Fitment in 30 Seconds

Before ordering, confirm the following on your guide bar or current chain:

• Bar Length: 18"

• Pitch: .325"

• Gauge: .063"

• Drive Links: 74

⚠️ .063 gauge chains will not fit .050 or .058 gauge bars.

If you’re unsure, contact P&P Small Engines and we’ll help verify compatibility before you order.

Compatible Stihl Models

This OEM Stihl chain fits the following models when equipped with an 18" .325 pitch .063 gauge bar:

• MS 261 / MS 261 C-M

• MS 260 Pro

• MS 270

• MS 271 Farm Boss®

• MS 290 Farm Boss®

• MS 291 Farm Boss®

• MS 310

• MS 311 Wood Boss®

⚠️ Model alone does not guarantee fitment — bar specifications must match.

Product Specifications

• Brand: Stihl (OEM)

• OEM Part Number: 3689-005-0074

• Chain Model: 26RM3 Rapid Micro

• Pitch: .325"

• Gauge: .063"

• Drive Links: 74

• Bar Length Compatibility: 18"

• Use Type: Firewood cutting, landowner use, professional cutting

Why Choose an OEM Stihl Rapid Micro Chain?

• ✅ Exact factory specifications for proper fit

• ✅ Semi-chisel cutters for durability and easy sharpening

• ✅ Smooth cutting performance with reduced vibration

• ✅ Designed specifically for Stihl guide bars

• ✅ Avoids fitment and wear issues common with aftermarket chains

OEM Stihl chains deliver reliable performance and long service life.

Why Buy From P&P Small Engines?

• 🔧 Small-engine specialists — not a big-box seller

• 🔧 Genuine OEM Stihl parts only

• 🔧 Fitment support before purchase

• 🔧 Fast, careful shipping

We help you get the right chain the first time.

Frequently Asked Questions

Q: Will this chain fit my MS 261 C-M?
A: Yes, if your MS 261 C-M is equipped with an 18" .325 pitch .063 gauge bar.

Q: Is this chain OEM Stihl?
A: Yes. This is a genuine Stihl OEM chain, part number 3689-005-0074.

Q: What does Rapid Micro mean?
A: Rapid Micro is Stihl’s semi-chisel cutter design, offering durability and easy maintenance.

Common Search Terms

• Stihl 3689-005-0074 chain

• Stihl 26RM3 chain

• Stihl MS 261 18 inch chain OEM

• Stihl .325 .063 74DL chain

• Stihl Farm Boss chain

Questions?

If you need help confirming bar compatibility or selecting the correct chain, contact P&P Small Engines — we’re happy to help.