# STIHL MS661 — 30" bar — STIHL chain 3621 000 0098

For STIHL MS661, bar length is 30"; pitch is 3/8"; gauge is 1.6mm; stihl chain part number is 3621 000 0098, verified against its source on 2026-09-07.

- **Model:** MS661
- **Bar length:** 30" _(verified: appears in the quote below)_
- **Pitch:** 3/8" _(verified: appears in its own passage below)_
- **Gauge:** 1.6mm
- **STIHL chain part number:** 3621 000 0098 _(verified: appears in the quote below)_

## What the source says

> MS 500i, MS 661                                        £44.17        £53.00         3621 000 0098      75 / 30     3/8        1.6        RS

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Pitch

> RS 3/8 1.6 MM £649.17 £779.00 3621 000 1640

### Gauge

> RS 3/8 1.6 MM £649.17 £779.00 3621 000 1640

## Source

- https://www.stihl.co.uk/content/dam/bpor/vu/gb/pdf-files/marketing/STIHL_MS_MSA_Cutting_Attachments_2025.pdf

Last verified: 2026-09-07. Review by: 2028-09-06.
Part of [Stihl chainsaw chain and bar specifications by model](https://referencesource.org/stihl-chainsaw-chain-and-bar-specs/).