Flank vs Flap Steak — What's the Difference?
Quick Answer
Flank (flank steak) and Flap Steak (flap steak (sirloin flap)) are not the same cut: Flank is flank primal (abdominal flank steak); Flap Steak is sirloin primal (Bottom sirloin, obliquus internus abdominis muscle).
Canonical entities: Flank · Flap Steak
Side-by-side
| flank | flap steak | |
|---|---|---|
| Primal | flank | sirloin |
| Muscle / location | abdominal flank steak | Bottom sirloin, obliquus internus abdominis muscle |
| Character | Long, fibrous abdominal cut; benefits from slicing across the grain. | A thin, coarse-grained steak from the bottom sirloin. The American name for what the French call bavette d'aloyau. Open grain absorbs marinades extremely well. Popular for fajitas, stir-fry, and carne asada. Often confused with skirt steak but from a different location entirely. |
Key differences
- Different primals: flank vs sirloin.
- Texture and slicing: compare fibrous, grain-heavy cuts vs more tender steak-style muscles based on each cut’s description.
- Retail naming diverges by country—always map through a canonical cut when translating menus or labels.
When to use each
Flank
Pick Flank when you want its specific marbling/texture profile: Long, fibrous abdominal cut; benefits from slicing across the grain.
Flap Steak
Pick Flap Steak when its primal/muscle traits fit the dish: A thin, coarse-grained steak from the bottom sirloin. The American name for what the French call bavette d'aloyau. Open grain absorbs marinades extremely well. Popular for fajitas, stir-fry, and carne asada. Often confused with skirt steak but from a different location entirely.
Flank and Flap Steak are different canonical muscles/primals: Flank is flank (abdominal flank steak); Flap Steak is sirloin (Bottom sirloin, obliquus internus abdominis muscle).
Choose based on tenderness, marbling, grain direction, and how you plan to cook (sear vs braise vs slice thin).
Read the full guides: flank (what-is) · flap steak (what-is) · flank hub · flap steak hub