Coffee Roaster Drum & Chaff Screen in 304 Stainless Steel (AISI 304 (1.4301)) is used for forming the perforated drum and chaff collector of coffee roasters so hot air passes the beans while chaff is carried away. The alloy gives good general corrosion resistance in atmosphere and fresh water and is essentially non-magnetic (annealed), with a practical service limit of approx. +450 °C continuous.
Alloy Properties
| Grade designation | AISI 304 (1.4301) |
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| Magnetic response | Essentially non-magnetic (annealed) |
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| Service temperature | approx. +450 °C continuous |
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| Corrosion characteristic | Good general corrosion resistance in atmosphere and fresh water |
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Specifications of Coffee Roaster Drum & Chaff Screen Available in 304 Stainless Steel
| Size | Hole diameter (mm) | Pitch (mm) | Thickness (mm) | Open area (%) | Use |
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| u00d82.0 / P3.5 | 2.0 | 3.5 | 1.0 | 29.6 | Drum shell, 250 g u2013 1 kg |
| u00d82.5 / P4.0 | 2.5 | 4.0 | 1.2 | 35.4 | Drum shell, 1 u2013 5 kg |
| u00d81.5 / P2.5 | 1.5 | 2.5 | 0.8 | 32.6 | Chaff collector |
| u00d83.0 / P5.0 | 3.0 | 5.0 | 1.5 | 32.6 | Cooling tray floor |
Where 304 Stainless Steel Coffee Roaster Drum & Chaff Screen Is Used
- Roaster OEMs: drum shells and chaff collectors.
- Specialty roasteries: replacement cooling-tray floors.
- Home roaster makers: small drum shells.
- Nut & seed roasting: perforated drums for peanuts and cocoa beans.
Ordering Coffee Roaster Drum & Chaff Screen in 304 Stainless Steel
- Hole size: Below the smallest bean (about 4 mm); 2–2.5 mm is typical.
- Thickness: 1.0–1.5 mm for thermal stability and stiffness.
- Open area: 30–35 % balances airflow and drum strength.
Mistakes to Avoid with Coffee Roaster Drum & Chaff Screen
- Choosing holes large enough for peaberries or broken beans to fall through.
- Thin drum shells that warp at roast temperature.
