Sieve Specifications

Frame Diameter

The sieve diameter is the length of the straight line from inside edge to inside edge of the frame, passing through the centre of the sieve. The sieve diameter should be measured at the top of the sieve.

Image showing sieve diameter

Frame Depth

The depth of the sieve is measured from the top of the frame to the surface of the woven wire mesh or perforated plate.

Image showing sieve depth

Woven Wire

All woven wire mesh used in Impact Test Sieves is manufactured from stainless steel.
Impact woven wire sieves are shown below.

Image showing sieve depth

Perforated Plate

The perforated plates used in Impact Test Sieves are manufactured from a punched plate of coated mild steel. A square hole perforated plate sieve manufactured by Impact is shown below.

Image showing sieve depth

Impact also manufactures round hole perforated plate sieves.

Grain & Coffee Sieves

Our range of Grain Sieves are manufactured from a slotted punched plate of stainless steel.
The image below shows one of Impact's Grain Sieves.

stainless steel perforated plate grain sieve

Impact Coffee Sieves are manufactured from round hole & slotted punched plate of stainless steel. Coffee sieves are available in 300mm diameter x 75mm or 45mm deep frames & 200mm x 50mm deep frames.

Please refer to the sieve specification table for frame sizes & materials of both woven wire & perforated plate sieves.

Impact Test Sieve Specifications

Frame Frame Material Sieve Depth
75mm Ø Stainless Steel 40mm
100mm Ø Stainless Steel 40mm
150mm Ø Stainless Steel 50mm
200mm Ø Stainless Steel 50mm
200mm Ø Brass 50mm
250mm Ø Stainless Steel 50mm
300mm Ø Stainless Steel 75mm
315mm Ø Stainless Steel 75mm
350mm Ø Stainless Steel 65mm
400mm Ø Stainless Steel 75mm
450mm Ø Stainless Steel 100mm
Half Height 200mm Ø Stainless Steel 25mm
Half Height 300mm Ø Stainless Steel 45mm
8 inch Ø Stainless Steel 2 inches
8 inch Ø Brass 2 inches
12 inch Ø Stainless Steel 3 inches
12 inch Ø Brass 3 inches
Half Height 8 inch Ø Stainless Steel 1 inch
Half Height 12 inch Ø Stainless Steel 1 ½ inches

200mm, 300mm, 8 & 12 inch Ø

Wet Washing Sieves

Stainless Steel Refer to Sieve Selector
450mm Ø West Washing Sieves Stainless Steel 300mm
200mm Ø Grain Sieve Stainless Steel 50mm
Half Height 200mm Ø Grain Sieve Stainless Steel 25mm
200mm Coffee Sieve Stainless Steel 50mm
457mm x 660mm Screen Trays Coated Mild Steel 75mm
Pocket Sieves Brass Ring N/A
300mm x 300mm Grid Sieves Painted Steel 75mm
200mm Air Jet Sieves Stainless Steel 25mm

Impact manufactures Coffee Bean Grading Sieves to ISO 4150:2011 and Green Coffee Grading Sieves to the classifications below.

1/64th Inch Classification Central America & Mexico Colombia Africa & India
20/64" Very Large Superior Supremo AA
19.5/64" Very Large Superior Supremo AA
19/64" Very Large Superior Supremo AA
18.5/64" Large Superior Supremo AA
18/64" Large Superior Supremo A
17/64" Large Superior Exelso A
16/64" Medium Segundas Exelso B
15/64" Medium Segundas Exelso B
14/64" Small Terceras Exelso C
13/64" Shells Caracol Exelso PB
12/64" Shells Caracol Exelso PB
11/64" Shells Caracolli Exelso PB
10/64" Shells Caracolillo Exelso PB
9/64" Shells Caracolillo Exelso PB
8/64" Shells Caracolillo Exelso PB

Sieve Frames: Made from stainless steel grade 430.
Sieve mesh aperture sizes 3.55mm and below: Made from Stainless steel grade 304 or 316.
Woven wire mesh aperture size 4.00mm and above: Made from stainless steel grade 304.
Perforated plates: made from coated mild steel unless stated otherwise.

Seamless frames ensure a precise fit and superior quality - All Impact sieves are guaranteed to meet the applicable standard