MSF Volumetric Screw Feeder

THAYER Model No.
Approx Feed Rate Range
(lbs/hr) based on 50 lb/ft³)
0.25 – 60
Standard Hopper Extension Capacity
*(liquid ft³)
1.0 – 3.0
Trough Capacity
*(liquid ft³)
Available Screw Sizes (in)
0.375″ – 0.5″ – 0.625″ – 1″ – 1.5″ – 2″
Typical Materials Handled


MSF Volumetric Screw Feeder

The Thayer Model MSF is designed for fast, easy and thorough clean out. The Screw Feeder completely disassembles without tools in less than one minute. High quality, rugged, stainless steel construction assures years of reliable, trouble free operation even in the most severe industrial environments. The unique combination of vertical-wall supply hopper, preconditioning trough/chamber containing a special horizontal agitator (optional), accounts for the Model MSF superior performance and reliability.

An important factor in achieving high accuracy using volumetric screw feeders is consistent material bulk density. This can be achieved by a properly designed and selection agitator located in the conditioning zone of the feeder trough. The agitator de-aerates the material to a uniform density and breaks any bridges or rat holes. This combination with a wide section of agitator designs allows a greater cross-section of materials to be fed very accurately.

Volumetric Capacity

Up to 23 ft3/hr (0.65 m3/hr) at a material bulk density of 50 lb/ft3 (0.8 gr/cm3). Consult factory for higher feed rates.

Screw Sizes

Range from 3/8″ Ø. (variable pitch) to 2.0″ Ø (variable pitch) open helix.

Hopper Capacity

Hoppers available as an extension of the feed trough, 0.50 Ft3 hopper expandable to 2.0 Ft3. For larger hopper sizes consult factory.

Trough Agitator

Independently driven, constant speed, horizontal mount with 0.25 HP, AC motor 230 or 460). Continuously conditions material to aid in de-aeration & maintain a uniform bulk density.

Feeder Drive

0.5 HP, AC, Inverter Duty, TEFC, 230 or 460 VAC.

Material Contact Surface

2B Mill Finish (material contact parts), 304 and 316 Stainless Steel, other finishes available.

Non-Material Contact Surfaces

Carbon steel painted with primer and industrial grade enamel paint (special coatings and stainless steel available upon request).

Temperature Range: Material

32°F (0°C) to 130°F (55°C) standard. Consult factory for other temperatures.


1.0% to 2.0% of set rate ±2 sigma based on thirty consecutive, 1 minute samples.