Socket head screws with a deeper drive than flat and rounded head screws, socket head screws withstand more torque for a tighter hold. install in a counterbored hole or above the surface.
Total quality management at our end, has enabled us in providing our patrons with a fault free product, where the entire range of our astm a320 grade l7m alloy steel stud bolt is checked on stringent parameters to ensure quality. the high content of lead in astm a320 grade l7m as bolt results in a relatively low ductility and plasticity.
Except for the very lowest grades, metric nuts and bolts all carry identification markings which indicate their strength. on the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3.6 to 14.9 but in plant and machinery only grades 8.8, 9.8, 10.9 and 12.9 are normally found.
Is : 53721975 3. material -the taper washers shall be made from any suitable low carbon steel. note-suitable low carbon steels are indicated in is : 15704961 ’ schedules for wrought steels for general englneer- ing purposes ‘. 4. grade- the taper washers shall conform to ‘ordinary’ grade specified in is : 5369-1975
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