Q. What size seamless brass tubes come in?

Answer

The standard sizes of seamless brass tubes: NPS varies like 1/8, 1/4, 3/8, 1/2, 3/4, 1 ½, 2, 2 ½, 3, 3 ½, and 4 NPS; Outside diameter varies from 10.3 mm to 114.3 mm; wall thickness varies from 1.24 mm to 13.49 mm; and length can go beyond 12 feet.