Choosing between a thick 6061 aluminum block and a thin 3003 aluminum sheet means deciding what shape and properties your next project actually needs. The 6061 flat bar is a compact 1/2" x 8" x 8" slab, while the 3003 plate sheet covers a larger 12" x 24" footprint at only 1/16" thick. Both are new US-made aluminum stock, but they serve very different shop situations.
Quick Verdict
The 6061 flat bar is the better pick if you need a solid block for machining. The 3003 plate sheet is the better pick if you need a large, corrosion-resistant sheet for panels or covers.
Price and Shape Comparison
| Product | Listed Price | Price Bar |
|---|---|---|
| 6061 Aluminum Flat Bar, 1/2" x 8" x 8" long, Solid Stock, Plate, Machining | USD 40.99 | |
| 1/16" Thick Aluminum Plate Sheet 12" x 24" 3003 Alloy Stock Mill Finish NEW | USD 29.58 |
Where Each Product Wins
- 6061 Flat Bar wins for machining: Its 1/2" thickness and stated tolerances make it a practical starting block for cutting or milling.
- 3003 Plate Sheet wins for corrosion resistance: Alloy 3003 is described as offering excellent corrosion resistance, which suits outdoor or moisture-exposed projects.
- 3003 Plate Sheet wins for surface area: It delivers a much larger piece of aluminum, covering more ground than the compact flat bar.
Product Notes
6061 Aluminum Flat Bar, 1/2" x 8" x 8" long, Solid Stock, Plate, Machining
This 6061 flat bar is a solid 1/2" thick slab with an 8" x 8" footprint. It comes with a machined finish, T6511 temper, and stated tolerances of -0.002" to +0.020" for thickness/width and +0.000" to +0.250" for length. That makes it a useful choice for machining projects that need a defined block. The product is described as having normal scratches or nicks because it is not intended to have a finished surface, so it is meant for functional work rather than cosmetic display. The item type is flat stock, and the alloy is aluminum 6061. If you are cutting or milling a small part that needs a thicker starting block, this bar is the direct route.
1/16" Thick Aluminum Plate Sheet 12" x 24" 3003 Alloy Stock Mill Finish NEW
This 3003 plate sheet measures 12" x 24" with a 1/16" thickness. Alloy 3003 is described as having excellent corrosion resistance, and the mill finish and H14 temper are specified. The item type is aluminum plate sheet, and the product has tolerances of +/-0.125" for length and width and +/-0.005" for thickness. That makes it useful for projects that need a large, thin piece of aluminum, such as panels, shields, or brackets where corrosion resistance matters. The tradeoff is that it is much thinner than the 6061 block, so it cannot serve as thick machining stock. If you need a wide sheet that resists corrosion, this option delivers more surface area.
Final Choice by Use Case
Choose the 6061 Aluminum Flat Bar when you want a compact, thicker piece of solid stock for machining. Choose the 3003 Aluminum Plate Sheet when you want a larger, thinner, corrosion-resistant sheet for panels or covers.
