Paint-banding is an approved casing color code labeling method for quick identification of OCTG casing and tubing standardized by API 5CRA/5CT.
Though there can be some variance among manufacturers, CRA labels in accordance with API tubing and casing specification 5CRA/ ISO 13680. To this standard, color bands are painted around the circumference of the pipe near the end of the product and run mill to field, or box to pin-end. The three band color-coding sequence identifies the pipe material category and casing grade. The first two paint bands, closest to the mill or box-end, represent the material category, such as alloy 2550 or 2535. The third band identifies the material grade or minimum yield strength of the material, such as 110 or 125 ksi.