Product Name: BS 4882 Heavy Hexagon Nut
Design Standard: BS 4882
Size: 1-1/8 Inch
Material: ASTM A453 Grade 660 Class B
Thread Standard: ASME B1.1 Class 2B
Source: https://www.landeepipefitting.com/astm-a453-grade-660-hex-nut-class-b-bs-4882-1-1-8-inch.html