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.