STIHL 3689-005-0068 OEM 18" Chainsaw Chain – 26RM3 for MS 250 & MS 251

Genuine STIHL OEM replacement chainsaw chain 3689-005-0068 for compatible STIHL MS 250 and STIHL MS 251 chainsaws equipped with an 18-inch bar using .325" pitch, .063" gauge, and 68 drive links.

This is the factory-spec STIHL 26RM3 Rapid Micro 3 chain, not an aftermarket replacement. It is designed for dependable cutting performance, smooth operation, and proper fit on compatible STIHL saws.

If you are searching for a STIHL MS 251 replacement chain, STIHL MS250 chain, STIHL 26RM3 chain, or STIHL 3689-005-0068, this is the genuine OEM chain.

STIHL 3689-005-0068 Specifications

• Brand: STIHL

• Genuine OEM Part: Yes

• OEM Part Number: 3689-005-0068

• Chain Model: 26RM3 Rapid Micro 3

• Bar Length: 18 inch

• Pitch: .325"

• Gauge: .063"

• Drive Links: 68

• Cutter Style: Semi-chisel

• Condition: New

• Recommended Use: General cutting, firewood, property maintenance, and everyday chainsaw use

Fits STIHL MS 250 and MS 251

This 18-inch STIHL chainsaw chain is designed for compatible:

• STIHL MS 250

• STIHL MS 251

Your saw must be equipped with an 18-inch guide bar using .325" pitch, .063" gauge, and 68 drive links.

STIHL saws can be configured with different bar and chain combinations, so always verify the specifications on your existing guide bar or chain before ordering.

STIHL MS 251 Replacement Chain

Looking for the correct STIHL MS 251 replacement chain?

For MS 251 saws configured with an 18-inch bar, .325" pitch, .063" gauge, and 68 drive links, STIHL 3689-005-0068 / 26RM3 68 is the genuine OEM replacement chain.

Choosing the correct pitch, gauge, and drive-link count is essential. Bar length alone is not enough to guarantee fitment.

STIHL MS 250 Replacement Chain

This chain also fits compatible STIHL MS 250 chainsaws using the same:

• 18" bar

• .325" pitch

• .063" gauge

• 68 drive links

If your MS 250 has a different guide-bar setup, you will need a different chain.

What Is STIHL 26RM3?

STIHL 26RM3 is part of STIHL's Rapid Micro 3 chain family. It uses a semi-chisel cutter design intended to provide smooth, dependable cutting performance for general-purpose chainsaw use.

The 26RM3 68 designation refers to this specific chain configuration with 68 drive links.

Verify Fitment Before Ordering

Check your guide bar or existing chain for these four specifications:

• Bar length: 18"

• Pitch: .325"

• Gauge: .063"

• Drive links: 68

These specifications are commonly stamped on the guide bar.

If all four specifications match, this is the correct chain configuration.

If you are unsure, contact P&P Small Engines before ordering and we can help verify fitment.

Why Buy a Genuine STIHL OEM Chain?

A genuine STIHL chain is manufactured to STIHL specifications for compatible equipment.

Benefits include:

• Correct chain geometry for compatible STIHL guide bars and sprockets

• Consistent cutter design

• Proper fit when matched to the correct pitch, gauge, and drive-link count

• OEM construction and materials

• No uncertainty about aftermarket cross-references

This listing is for a genuine STIHL chain, not an aftermarket substitute.

Why Buy From P&P Small Engines?

P&P Small Engines specializes in genuine OEM outdoor-power-equipment parts.

When you order from us, you get:

• Genuine OEM STIHL parts

• Help confirming chain fitment

• Small-engine parts expertise

• Careful order fulfillment

• Support from people familiar with the equipment

Our goal is to help you order the correct part the first time.

Frequently Asked Questions

What chain fits a STIHL MS 251 with an 18-inch bar?

For an MS 251 configured with an 18-inch bar using .325" pitch, .063" gauge, and 68 drive links, STIHL part 3689-005-0068, also known as 26RM3 68, is the correct OEM chain configuration.

Will STIHL 3689-005-0068 fit an MS 250?

Yes, when the MS 250 uses an 18-inch bar, .325" pitch, .063" gauge, and 68 drive links.

Is this a genuine STIHL MS 251 chain?

Yes. This is a genuine STIHL OEM 26RM3 chain, part number 3689-005-0068.

What does 26RM3 68 mean?

26RM3 identifies the STIHL Rapid Micro 3 chain family and configuration. The 68 indicates the chain has 68 drive links.

What pitch is STIHL 3689-005-0068?

This chain uses .325" pitch.

What gauge is STIHL 3689-005-0068?

This chain uses a .063" gauge.

How many drive links does this chain have?

This chain has 68 drive links.

Is this chain aftermarket?

No. This listing is for a genuine STIHL OEM replacement chain.

How do I know if this chain fits my saw?

Match all four specifications on your current setup:

18-inch bar + .325" pitch + .063" gauge + 68 drive links.

If any specification is different, choose the chain that matches your actual guide-bar configuration.

Order STIHL 3689-005-0068

Get the genuine STIHL 26RM3 68 replacement chain for compatible STIHL MS 250 and MS 251 chainsaws.

For help confirming fitment, contact P&P Small Engines before ordering.