Atta plants buy two different screens and often use one name for both. Garg Industrial Mesh keeps them apart.
Chakki jali
The sheet in the chakki chamber is punched. On this chart, 7½ No. is 2 mm, and that is the rice mill and atta chakki chamber screen. Some chambers and graders sit on 8½ No. at 2.5 mm. A finer hopper on the same line can be a micro number, down to 3 No. The number comes from the sheet in that housing, not from the word atta.
Channi
Atta channi is woven cloth, 40×36 mesh × SWG, usually SS 304. It sits on the sifter. It has no hole number.
How the plant orders
One line for the chamber: hole number, metal, thickness, plate size. One line for the sifter: 40×36, metal, roll width. SS 304 is the usual food metal for both. Brass and copper follow the old piece.
Both are cut at G-25, G Block, Sector 9, Noida. Call or WhatsApp 9910238277.