Title: identification marks for hex and heavy hex nuts author: fastener mart created date: 8/12/2006 10:47:21 pm
To produce hex bolts, manufacturers most commonly employ a method called cold-forming. a cold-forming machine usually has a series of three or four dies that progressively shape a metal blank into the final shape and dimensions that its manufacturer desires.
Carriage bolt, metric, din 603, grade 4.6, round head, square neck, with hex nut, zinc plated
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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