This document covers metric studs made from a corrosion and heat resistant, age hardenable iron base alloy of the type identified under the Unified Number System as UNS S66286. The following specification designations and their properties are covered: MA3375 900 MPa minimum ultimate tensile strength at room temperature; MA3375-1 900 MPa minimum ultimate tensile strength at room temperature, 480 MPa stress-rupture strength at 650 degrees C; MA3375-2 900 MPa minimum ultimate tensile strength at room temperature, 590 MPa minimum ultimate shear strength at room temperature. Two types of studs are covered as follows: Type I - studs with stud end thread having special oversize pitch diameter and lead thread with undersize pitch diameter, while nut end thread is standard size; and Type II - studs with stud end thread and nut end thread standard size.