50mm bore?
Thundermugs are fine on this Forum no worries
Yes. 50mm and it is very heavy built. Materials are st52.
The "52" means a minimum tensile strength of 52 kg per sq. mm. In SI units, this is 510 MPa. In Imperial units, it's 73,961 (that is, in practice, 74,000 or 75,000) psi.
mvh