Coffee Roaster Drum & Chaff Screen in 316L Stainless Steel (AISI 316L (1.4404)) 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 superior resistance, including chlorides, brines, food CIP and mild acids and is essentially non-magnetic, with a practical service limit of approx. +550 °C continuous.
Alloy Properties
| Grade designation | AISI 316L (1.4404) |
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| Magnetic response | Essentially non-magnetic |
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| Service temperature | approx. +550 °C continuous |
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| Corrosion characteristic | Superior resistance, including chlorides, brines, food CIP and mild acids |
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Specifications of Coffee Roaster Drum & Chaff Screen Available in 316L 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 316L 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 316L 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.
