Product Name: ASTM A182 F304 Nipoflange, Nipple Flange
Type: Nipple Flange
Standard: ANSI B16.5
Material: ASTM A182 F304
Size: 6 * 1 Inch, DN150*DN25
Pressure Class: Class 300 LB, PN50
Wall Thickness: SCH 40S * SCH 80S
End Connection: Flanged

Source: https://www.landee.cn/astm-a182-f304-nipoflange-ansi-b16-5-6-1-inch-cl300-lb.html