Flanges are made of forged or cast aluminium alloy.

Models designed for maximum rigidity and durability are produced through casting processes that are carried out with expertise and profession. The flanges that are at raw state after casting are turned on a lathe with a lot of attention and tested for safety before they are assembled to the barrels.

Flanges have two types. As shown in Table I, for the yarns that are listed in the first and the second section ribbed flanges and for the yarns that are listed in the third and fourth sections hallow-ribbed flanges are used.

Ribbed flanges are used for yarns that do not demand much tensile strength. The distances between ribs, the number of ribs and the rib sizes are determined based on the diameters of the flanges.

Hollow-ribbed flanges demand  lots of expertise and profession in casting. Resistance is very important when it comes to the production of yarns that cause high tensile strength. Quality is also very essential in the production of hallow-ribbed flanges to ensure the safety of the workers and the safety of the materials processed on those flanges. Tests about tensile strength become very important at this point and measure the resistance of the flanges.

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The table below shows the four main categories and the types of yarns that correspond to these categories.