3/8 STIHL PICCO pitch, 0.050 gauge, 55-drive-link chains

This exact signature appears in 3 verified factory configurations across STIHL. All three chain dimensions must match; nominal bar length alone does not establish fit.

Verified models using this signature

• STIHL MSA 220 C-B — 16 in
• STIHL MSA 220 TC-O — 16 in
• STIHL MSA 300 C-O — 16 in