# MS 291 — Stihl chainsaw chain and bar specifications by model

For MS 291, bar length is 18"; pitch is .325"; gauge is 1.6mm; drive links is 74; stihl chain part number is 3686/74, verified against its source on 2026-08-04.

- **Model:** MS 291
- **Bar length:** 18"
- **Pitch:** .325"
- **Gauge:** 1.6mm
- **Drive links:** 74
- **STIHL chain part number:** 3686/74

## What the source says

> MS 291, MS 291 C | 16" 18" | .325" .325" | 1.6mm 1.6mm | 67 74 | <https://www.lsengineers.co.uk/rm-rapid-micro-chain-1-6mm-0-063-325-genuine-stihl-oem-no-3686-000-0067.html> 3686/67 <https://www.lsengineers.co.uk/rm-chain-18-ms291-stihl-part-3686-000-0074.html> 3686/74

## Source

- https://www.lsengineers.co.uk/advice-centre/stihl-chain-selector

Last verified: 2026-08-04. Review by: 2028-08-03.
Part of [Stihl chainsaw chain and bar specifications by model](https://referencesource.org/small-engine-parts/).