SOCKET SCREWS
Socket Screw
Socket screw material alloying elements Manganese, Nickel, Chromium, Silicon, Titanium, Aluminium, Molybdenum, Vanadium and Copper can be added to steel to manipulate the steel's properties. The proportions of these elements will determine the properties of each socket screw alloy steel grade. When materials Molybdenum, Vanadium, Chromium or Nickel are added they create high strength steels and improve toughness; there is a high cost of adding these elements to the steel mix.
Along with Carbon and Alloy steel, there are Carbon-Boron steels. Small amounts of boron allow steels to be heat treated to high strengths without the cost penalty of other alloying elements, in many parts of the world there is widespread use of Boron steels for fasteners though there is some resistance in the USA because of historical failures. The properties of carbon-boron steels are not as good as alloy steels but they give a reasonable compromise between cost and improved properties benefits.
allen screws
UNC Hexagon Socket Shoulder Screw Grade-12.9 B18.3
UNC Socket Countersunk Screw Grade-12.9 B18.3
Metric Hexagon Keys Short Arm Steel DIN911
UNC Socket Cap Screw 1936 Grade-12.9 BS2470
Metric Coarse Socket Countersunk Screw Grade-10.9 DIN7991
Metric Coarse Hexagon Socket Shoulder Screw f9 Grade-12.9 BS4168
Metric Coarse Socket Cap Screw Stainless-Steel A2-70 DIN912
Metric Coarse Socket Button Head Screw Grade-10.9 ISO7380
Metric Coarse Socket Set Screw Cup Point Grade-14.9-45H DIN916
Metric Coarse Socket Cap Screw Grade-12.9 DIN912
Metric Coarse Socket Countersunk Full Thread Screw Grade-10.9 DIN7991
UNC Socket Cap Screw 1960 Full Thread Grade-12.9, Rc38/43 B18.3
Unbrako
Inch Hexagon Keys Long Arm Alloy Steel BS2470