Bar
CompatibleOregon
SpeedCut Pro-Lite (.325")
140SDEA040
18".325".050"74 DL
Stihl MS291 Chain & Bar Guide
55.5cc
Stihl MS291← Change saw
Specs
Pitch .325"must match bar + sprocket
Gauge .050", .063"must match bar groove
Bar range 16"–20"cutting length range
Sprocket 7-tooth rim.325" pitch
Drive links by bar length
16"66 DL18"74 DL20"78 DL
Farm Boss step-up. Ships .325" stock. More powerful than MS271 with the same bar range.
Wrong pitch, gauge, or drive link count can throw a chain or damage your saw. Check your saw's markings before ordering. More info
Source: Stihl service manual; Oregon cross-reference guideLast verified: 2026-04-21
Common setup
A typical Stihl MS291 setup
For general firewood: 18" Oregon SpeedCut Pro-Lite (.325") bar with Oregon 21BPX 78 semi-chisel chain. Both match this saw's pitch, gauge, and drive-link count.
Chain
CompatibleOregon
21BPX 78
21BPX078G
.325".050"78 DL
For dirty wood, hardwood cutting, milling, or different bar lengths, see the full list below.
All compatible guide bars12
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.050" gauge
16"
CompatibleStihl
Rollomatic E (.325")
3003-000-5209
16".325".050"66 DL10-tooth sprocket
Stihl OEM .325" bar — fits MS251/261/271/291. Verify part number.
CompatibleOregon
SpeedCut Pro-Lite (.325")
120SDEA040
16".325".050"66 DL10-tooth sprocket
Oregon aftermarket .325" bar — fits Stihl large-mount saws. Verify part number.
18"
CompatibleStihl
Rollomatic E (.325")
3003-000-5213
18".325".050"74 DL10-tooth sprocket
Stihl OEM .325" bar — fits MS261/271/291. Verify part number.
CompatibleOregon
SpeedCut Pro-Lite (.325")
140SDEA040
18".325".050"74 DL10-tooth sprocket
Oregon aftermarket .325" bar — fits Stihl large-mount saws. Verify part number.
20"
CompatibleStihl
Rollomatic E (.325")
3003-000-5217
20".325".050"78 DL10-tooth sprocket
Stihl OEM .325" bar — fits MS261/271/291. Verify part number.
CompatibleOregon
SpeedCut Pro-Lite (.325")
160SDEA040
20".325".050"78 DL10-tooth sprocket
Oregon aftermarket .325" bar — fits Stihl large-mount saws. Verify part number.
.063" gauge
16"
CompatibleStihl
Rollomatic E (.325" .063")
3003-000-5709
16".325".063"66 DL10-tooth sprocket
Stihl OEM .325" .063" heavy-gauge bar — fits MS261 C-M and MS291. Verify part number.
CompatibleOregon
PowerCut (.325" .063")
120TXLBA040
16".325".063"66 DL10-tooth sprocket
Oregon .325" .063" bar for Stihl large-mount saws. Verify part number.
18"
CompatibleStihl
Rollomatic E (.325" .063")
3003-000-5713
18".325".063"74 DL10-tooth sprocket
Stihl OEM .325" .063" heavy-gauge bar. Verify part number.
CompatibleOregon
PowerCut (.325" .063")
140TXLBA040
18".325".063"74 DL10-tooth sprocket
Oregon .325" .063" bar for Stihl large-mount saws. Verify part number.
20"
CompatibleStihl
Rollomatic E (.325" .063")
3003-000-5717
20".325".063"78 DL10-tooth sprocket
Stihl OEM .325" .063" heavy-gauge bar. Verify part number.
CompatibleOregon
PowerCut (.325" .063")
160TXLBA040
20".325".063"78 DL10-tooth sprocket
Oregon .325" .063" bar for Stihl large-mount saws. Verify part number.
All compatible chains23
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.050" gauge chains
For 16" bar – 66 drive links
CompatibleStihl
26RS3 66
3605-000-0066
.325".050"66 DLFull chisel
RS3 (Rapid Super 3)
Full chisel .325" .050" — fits 16" bar on MS251/261/271/291 and Husqvarna 450.
CompatibleStihl
26RM3 66
3636-000-0066
.325".050"66 DLSemi chisel
RM3 (Rapid Micro 3)
Semi chisel .325" .050" — stays sharp longer in dirty/frozen wood. Fits 16" bar.
CompatibleOregon
21BPX 66
21BPX066G
.325".050"66 DLSemi chisel
BPX (semi chisel low-kickback)
Oregon semi chisel .325" .050" — fits 16" bar on MS261/271/291 and Husqvarna 450.
CompatibleOregon
21LGX 66
21LGX066G
.325".050"66 DLFull chisel
LGX (full chisel low-kickback)
Oregon full chisel .325" .050" — fast cut for clean wood. Fits 16" bar.
CompatibleHusqvarna
H30 66
H30-66E
.325".050"66 DLSemi chisel
H30 semi chisel
Husqvarna branded .325" .050" semi chisel — fits 16" bar on 450 Rancher and Stihl .325" saws.
For 18" bar – 74 drive links
CompatibleStihl
26RS3 74
3605-000-0074
.325".050"74 DLFull chisel
RS3 (Rapid Super 3)
Full chisel .325" .050" — fits 18" bar on MS261/271/291.
CompatibleStihl
26RM3 74
3636-000-0074
.325".050"74 DLSemi chisel
RM3 (Rapid Micro 3)
Semi chisel .325" .050" — stays sharp longer in dirty/frozen wood. Fits 18" bar.
CompatibleOregon
21BPX 74
21BPX074G
.325".050"74 DLSemi chisel
BPX (semi chisel low-kickback)
Oregon semi chisel .325" .050" — fits 18" bar.
CompatibleOregon
21LGX 74
21LGX074G
.325".050"74 DLFull chisel
LGX (full chisel low-kickback)
Oregon full chisel .325" .050" — fits 18" bar.
CompatibleHusqvarna
H30 74
H30-74E
.325".050"74 DLSemi chisel
H30 semi chisel
Husqvarna branded .325" .050" semi chisel — fits 18" bar.
CompatibleHusqvarna
H30 72
H30-72
.325".050"72 DLSemi chisel
H30 semi chisel
Husqvarna .325" .050" 72DL — fits 18" bar on 440/445/450/545. Different drive link count from H30-74E.
For 20" bar – 78 drive links
CompatibleStihl
26RS3 78
3605-000-0078
.325".050"78 DLFull chisel
RS3 (Rapid Super 3)
Full chisel .325" .050" — fits 20" bar on MS261/271/291.
CompatibleStihl
26RM3 78
3636-000-0078
.325".050"78 DLSemi chisel
RM3 (Rapid Micro 3)
Semi chisel .325" .050" — stays sharp longer in dirty/frozen wood. Fits 20" bar.
CompatibleOregon
21BPX 78
21BPX078G
.325".050"78 DLSemi chisel
BPX (semi chisel low-kickback)
Oregon semi chisel .325" .050" — fits 20" bar.
CompatibleOregon
21LGX 78
21LGX078G
.325".050"78 DLFull chisel
LGX (full chisel low-kickback)
Oregon full chisel .325" .050" — fits 20" bar.
CompatibleHusqvarna
H30 78
H30-78E
.325".050"78 DLSemi chisel
H30 semi chisel
Husqvarna branded .325" .050" semi chisel — fits 20" bar.
CompatibleHusqvarna
H30 80
H30-80
.325".050"80 DLSemi chisel
H30 semi chisel
Husqvarna .325" .050" 80DL — fits 20" bar on 450/450 Rancher/545. Different drive link count from H30-78E.
.063" gauge chains
For 16" bar – 66 drive links
CompatibleStihl
26RS 66
3605-000-0066-063
.325".063"66 DLFull chisel
RS (Rapid Super)
Full chisel .325" .063" heavy gauge — fits 16" bar. Used on MS261 C-M and higher-spec .325" saws.
CompatibleOregon
22LGX 66
22LGX066G
.325".063"66 DLFull chisel
LGX (full chisel)
Oregon full chisel .325" .063" — fits 16" bar. Professional-grade heavy gauge.
For 18" bar – 74 drive links
CompatibleStihl
26RS 74
3605-000-0074-063
.325".063"74 DLFull chisel
RS (Rapid Super)
Full chisel .325" .063" heavy gauge — fits 18" bar.
CompatibleOregon
22LGX 74
22LGX074G
.325".063"74 DLFull chisel
LGX (full chisel)
Oregon full chisel .325" .063" — fits 18" bar.
For 20" bar – 78 drive links
CompatibleStihl
26RS 78
3605-000-0078-063
.325".063"78 DLFull chisel
RS (Rapid Super)
Full chisel .325" .063" heavy gauge — fits 20" bar.
CompatibleOregon
22LGX 78
22LGX078G
.325".063"78 DLFull chisel
LGX (full chisel)
Oregon full chisel .325" .063" — fits 20" bar.