STAINLESS STEEL - With the addition of 12 % chromium to iron, stainless steel is formed. The Chromium protects the iron against most corrosion or red coloured rust; thus the term stainless steel.  The ability of stainless to form a thin layer of protection on its outside surface, called a “Passive Film” is its most important characteristic in preventing corrosion.
 
The overriding purpose of stainles_steel is to provide corrosion resistance against: (a) atmospheric conditions such as carbon dioxide, moisture, electrical fields, sulphur, salt and' chloride compounds (b) natural and artificially produced chemicals (c) extremes weather where cold temperatures cause brittleness and hot temperatures reduce strength and increase corrosion.

TENSILE STRENGTH - A common measure to compare the strength of a fastener. It is the load needed to pull the fastener apart.
TORQUE OR TORSION STRENGTH - Torque is the force used in twisting, such as tightening a fastener. Torsion strength is the amount of force needed to twist a fastener apart. Both measures consider the amount of pressure applied to the fastener and the length of the wrench used in the application.

YIELD STRENGTH- The amount of pressure required to cause permanent deformity.

Chemical composition of S.S. Fasteners (% values in max unless otherwise stated).

All Dimensional, Mechanical and Chemical properties are as per specified standards. The designation system comply with ISO 3506 standard. A270 donates A= Austenitic chromium-nickel steel, 2 = Cold heading steel alloyed with chromium and nickel normally called as 304 grade. 4 = cold heading steel alloyed with chromium, nickel and molybdenum. 70 = property class, I.e.: Tensile Strength which is 10 times of the denoted figure in N/mm2 min.