(R) Studs, Corrosion and Heat Resistant Steel, UNS S66286 Tensile Strength 900 MPa, Procurement Specification, Metric
|Publication Date:||1 May 2018|
This document covers metric studs made from a corrosion and heat resistant, age hardenable iron base alloy of the type identified under the Unified Numbering 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 °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
Type II - Studs with stud end thread and nut end thread standard size
Primarily for aerospace propulsion system applications where a good combination of strength and resistance to corrosion are required. MA3375 studs are intended for use where the coefficient of expansion of the stud is more compatible for use in aluminum or magnesium alloys. MA3375-1 studs are intended for use at elevated temperatures in corrosion resistant steel parts. MA3375-2 studs are intended for studs loaded in shear.
Type I studs are intended for torque driving into aluminum or magnesium alloy tapped hole by interference fit assembly of stud end thread in accordance with MAP1670 studding practice.
Type II studs are intended for studding magnesium or aluminum alloys, and steel or corrosion resistant steel parts by locking the assembled stud end threads in the boss to resist rotation by an auxiliary method; for example:
a. By use of locking keys (individual or ring supported) driven into the assembled stud and boss threads parallel to thread axis.
b. By use of serrated lock ring driven into assembled studded boss so that internal serrations engage the stud serrated shank and external serrations broach the boss counterbore.
Safety - Hazardous Materials
While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.