N08811 Hex bolt

Alloy 800HT / Incoloy 800HT is a controlled composition derivative of INCOLOY® alloy 800H (UNS N08810) and is used for the same creep resistant applications, however the combined effects of mechanical and thermal processing of the alloy permit higher design stresses to be incorporated than are permitted for the conventional alloy. Alloy 800 HT also known as 1.4959,which  is an austenitic high-strength solid-solution nickel-iron-chromium alloy. Fluoropolymer coatings (e.g., PTFE) can be applied to Incoloy 800HT stud bolts for additional chemical resistance or non-stick properties