Micron-level grind adjustment and tenth-degree temperature stability are important in specialty coffee, and this low-profile bridge grinder and portafilter basket can increase coffee concentration, reduce waste and simplify workflow. Although there are alternatives to plastic and stainless steel funnels, precision-machined aluminum funnels are still the most popular dosing funnels today.

What materials are dosing funnels made of?

1. Plastic or resin funnel

It is relatively low-cost and compact in appearance. You can buy the color you want according to your needs. It acts as a heat sink during the dosing process and has a cooling and preheating filter basket.

2. Stainless steel funnel

Stainless steel funnels have industrial-grade durability, can be used in dishwashers, and are relatively light. The polished surface has good electrostatic adsorption even without special coatings. This funnel is slow to balance with the preheated coffee portafilter, which will produce micro-thermal shock.

3. Aluminum alloy funnel:

Aluminum alloy funnels are relatively light and have a good balance between thermal conductivity and static dissipation. Electrolytic oxidation forms a crystalline surface layer of 25-50μm, which is 30% harder than the original alloy. The non-conductive surface eliminates triboelectric charges.

What are the properties of aluminum funnels?

1. Static elimination technology

Anodized aluminum has almost zero triboelectric charging compared to organic compounds in coffee. Compared with plastic, aluminum funnels have 98% less residual coffee powder and 70% higher efficiency in chaff removal.

2. Ergonomics

The aluminum funnel can be operated with one hand when grinding or pressing powder. Its design is relatively low-key, with a stainless steel head to prevent the product from tipping over due to being too light. The funnel has an anodized texture, which can be firmly grasped even with wet hands.

3. Thermal synchronization

The product can reach thermal equilibrium with the preheated handle within 15 seconds. It also has good impact resistance, which can reduce the temperature drop of the powder basket during metering or dispensing.

4. Durability designed for workflow

It has good wear resistance, and the anodized layer can withstand the scratches of WDT tools and daily wiping.

5. Magnetic Revolution

Generates 1.5-3 kg of pulling force through the funnel wall. The magnetic "snap" adsorption can be completed in 1 second, without the need for more than 5 seconds of friction ring fiddling. It will not fall off when the WDT or grinder vibrates violently. It also supports the reverse grinding technology of zero-residue grinders.

Choose Your Ultimate Funnel – Technical Checklist

1. Exact Dimensions (non-negotiable)

|  Handle Standard |  Strainer OD |  Recommended Funnel ID |

|--------------------------|---------------------------|---------------------------|

| E61 (58 mm) | 58.30 - 58.70 mm | 58.55 ±0.05 mm |

| Breville/Sage 54 mm | 53.80 - 54.10 mm | 53.95 ±0.05 mm |

| La Marzocco ST/GBW | 57.80 - 58.20 mm | 58.00 ±0.05 mm |

Use a caliper to verify basket specifications – the nominal “58 mm” has a 0.5 mm tolerance!

2. Height and Taper Geometry

* Low Profile (45-55mm): Best for tight grinder clearances; requires fine grinding technique.

* High (60-75mm): Captures tall grinding posts; accommodates large grinders.

* Tapered Wall: Helps grind collapse during WDT; prevents "donut" retention.

3. Magnetic System Engineering

Number of Magnets: 4-8 magnets ensure even force distribution.

Embedment Depth: 2mm or more below the surface to prevent grinding damage.

Polarity Alignment: Alternating polarity improves adhesion stability.

4. Anodizing Quality Control

Thickness: Hard anodizing (Type III) thickness >25μm.

If you would like to know more, please feel free to contact Shenzhen Sangu Innovation Technology Co., Ltd.!