Stihl model · engine series 1139
MS 181
31.8 cc; all MS 181s are series 1139 (1139 020 xxxx parts)
The production, market and rarity details above are specific to the MS 181 roster record. The chain, bar and displacement figures below are the published family fitment for engine series 1139; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.
Family fitment specs
Chains & bars that fit the MS 181
Pitch & gauge 3/8″ Picco / .325″ · recommended bar 14–18″ · round file 5/32" (4.0 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 14″ | 50 DL | Chain → Bar → |
| 16″ | 55 DL | Chain → Bar → |
Drive-link counts from STIHL's saw-chain catalog. The chain is set by pitch + length (confirm the count stamped on your bar); the guide bar also depends on your saw's mount, so verify fitment before ordering.
Files, oil & sharpening
Suggested match: Oregon 90/91-series (e.g. 91PX). Confirm the drive-link count for your exact bar length before ordering. These are equivalent aftermarket (Oregon) chains, not genuine STIHL chain — STIHL sells its own chain through its dealer network, and we're not affiliated with STIHL. New to pitch & cutter types? See the chain & cutter guide.
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Related models in series 1139
Data confidence
Chain, bar and displacement confidence applies to the shared MS 171 · 181 · 211 family data.
Something wrong or missing for the MS 181? Report a correction →