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アルミ板厚さの目安: 適切なゲージを指定する方法
アルミ板厚さの目安: 適切なゲージを指定する方法
Specifying aluminum sheet thickness sounds simple, but it is where many buyers get tripped up. Gauge numbers, millimeters, “シート” versus “皿” boundaries and the difference between nominal and actual thickness all matter. Get it wrong and the part either cannot be formed or costs more than it should.
Sheet vs Plate: Where Is the Line?
In most commercial practice, aluminum under 6.0 mm is called sheet and 6.0 mm and above is called plate. This is a practical convention, not a strict standard, but it matters when you ask a supplier for a quote because pricing, tooling and lead time differ. Our sheet range includes 1060 シート, 3003 シート と 5052 シート; thicker structural and aerospace stock is listed under our 6061 T6プレート と 7075 T6プレート.
Common Gauges and Their Typical Uses
| 厚さ | 一般的な使用方法 |
|---|---|
| 0.3 – 0.8 んん | Foil, capacitor, 梱包, 深い描画 |
| 1.0 – 2.0 んん | 調理器具, 兆候, 側溝, 装飾パネル |
| 2.0 – 4.0 んん | Tank skins, trailer panels, ダイヤモンドトレッド |
| 4.0 – 6.0 んん | Marine plate, 道路標識, structural skin |
| 6.0 – 50 んん | Machined plate, ツーリング, 備品, 航空宇宙 |
Nominal vs Actual Thickness
Aluminum sheet is sold by nominal thickness, but actual thickness varies by gauge tolerance. あ “2.0 んん” sheet can be 1.88 – 2.04 mm in commercial quality. If your part is CNC-machined to a tight dimension, specify both nominal and allowed tolerance (例えば, 3.0 ± 0.10 んん) and we will confirm the mill’s capability. For tread (ダイヤモンド) 皿, remember the listed thickness usually refers to the base thickness, not the peak of the pattern.
What Else to Specify
Beyond gauge, buyers should also specify: alloy and temper (1060 H14, 3003 H24, 5052 H32, 6061 T6, 等), width and length (standard sheets are 1220 × 2440 mmまたは 1500 × 3000 んん), surface finish (ミル仕上げ, 起毛した, 陽極酸化された, PVC protected) and packaging (pallet, bundle, anti-corrosion paper). Sending a single number — “give me 2 mm aluminum” — leaves too much room for misinterpretation.
