ASTM A193 B7 Stud Bolt with A194 2h Heavy Hex Nut
Socket head screws used in machinery, mainly for fastening, disassembly, it is not easy to slip Angle and other advantages. Allen wrench is usually a 90 ° bend, bend at one end of the long and short, with a short side of the screw, holding a long side can save a lot of power and better tighten screw. Long runs round head at one end (hexagonal cylindrical similar sphere) peace head, round head can be easily inserted into the screw hole is very convenient disassembly, the outside hexagonal manufacturing costs less than Allen, its advantages and screw head (wrench stress location) thinner than Allen, in some places is not Allen can replace. Also the cost is low, dynamic strength is small, low accuracy of machine adopt socket head screw is much less than the outer hexagon.