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Nominal diameter
Small diameter: common DN15 (1/2 inch), DN20 (3/4 inch), DN25 (1 inch), DN32 (1 1/4 inch), DN40 (1 1/2 inch), DN50 (2 inch).
Medium diameter: such as DN65 (2 1/2 inches), DN80 (3 inches), DN100 (4 inches), DN125 (5 inches), DN150 (6 inches).
Large diameter: DN200 (8 inches), DN250 (10 inches), DN300 (12 inches), DN350 (14 inches), DN400 (16 inches), and even larger caliber up to DN600 (24 inches) and so on.
Outside diameter size
Thin-walled pipe: common outside diameter of 12mm, 14mm, 16mm, 18mm, 20mm, 22mm.
Regular size: 25mm, 27mm, 32mm, 34mm, 38mm, 42mm, 45mm, 48mm, 51mm, 57mm, 60mm.
Larger sizes: 76mm, 89mm, 108mm, 114mm, 133mm, 159mm, 219mm, 273mm, 325mm, 377mm, 426mm, 478mm, 530mm, 630mm.
Wall Thickness Dimensions
Thin wall thickness: e.g. 2mm, 3mm.
Medium wall thickness: 4mm, 5mm, 6mm.
Thicker wall thickness: some stainless steel tees used in high pressure or special working conditions, the wall thickness may reach 8mm, 10mm or even thicker.
Special specifications
Reducing tee specifications: such as DN50×40, DN80×65, etc., indicating that the main pipe caliber is different from the branch pipe caliber.
Customized specifications: In some special projects, non-standard stainless steel tee fittings may be customized according to specific needs, such as non-standard calibers, wall thicknesses, angles and so on.

Specifications for large diameter stainless steel tee fittings usually include the following:
Nominal diameter
DN200 and above: DN200 (8 inches), DN250 (10 inches), DN300 (12 inches), DN350 (14 inches), DN400 (16 inches), DN450 (18 inches), DN500 (20 inches), DN600 (24 inches), DN700 (28 inches), DN800 (32 inches), DN900 (36 inches), DN1000 (40 inches) and so on.
Outside diameter size
Common sizes: 219mm, 273mm, 325mm, 377mm, 426mm, 478mm, 530mm, 630mm, 720mm, 820mm, 920mm, 1020mm, etc.
Wall Thickness
Thin wall thickness: 6mm, 8mm.
Medium wall thickness: 10mm, 12mm, 14mm.
Thicker wall thickness: 16mm, 18mm, 20mm and above, some high pressure, high temperature or high corrosive stainless steel tee used in special working conditions, the wall thickness may be thicker.
Reducer specifications
Common combinations: such as DN300×250, DN400×350, DN500×400, DN600×500, etc., indicating that the caliber of the main pipe is different from the caliber of the branch pipe.