The good corrosion properties of the DIN 931 hex bolt manufactured from This holds true particularly as grade 316 stainless steel has a higher resistance to both pitting as well as crevice corrosion in chloride environments. stainless steel grade 316 has been cold worked to provide a minimum tensile DIN 931 bolt strengthĪs compared to stainless steel grade 304, grade 316 provides better overall corrosion resistant properties. Usually, the A4-70 is manufactured from stainless steel grade 316 material or its low carbon variant gradeģ16L. Similar to the A2, the A4-70 DIN 931 bolt material specification is an austenitic, acid proof stainless grade. Grade, some residual magnetism of the alloy can be introduced when the material of the DIN 931 Bolts Although the A2 is mostly considered to be a non-magnetic austenitic stainless steel This can be attributed to the high content of chromium and nickel in the alloy of the DIN 931īolt M8x15 (Metallurgical, the A2 or the ASTM-304 has a designation of 18/8 Stainless Steel or 18%Ĭhromium & 8% Nickel). Steel grade 304, which is known for its Corrosion Resistant properties. The A2 version of the DIN 931 bolt material is manufactured from Stainless The strength of the DIN 931 bolt M10x18 is indicated by the marking on the head and it is also defined by The tensile strength for both these steel grades is around 700 Mpa. This International Standard specifies the characteristics of hexagon head bolts with threads from M1,6 up to and including M64, of product grade A for threads M1,6 to M24 and nominal lengths up to and including 10d or 150 mm, whichever is the shorter, and product grade B for threads over M24 or nominal lengths over 10d or 150 mm, whichever is the shorter.Ĭommercially, the steel quality used to manufacture of the DIN 931 grade 8.8 bolts includes

Din 267 Part 11