Specification stud bolts tap studs, With r gasket api type 6b flange s l with rx gasket stud bolt with nuts point height l api type 6b flange l s figure 2.0-1 l api type 6bx flange no standoff. Dimensions welding neck flanges(vorschweiss-flansche) type, Table with dimensions of pn100 vorschweiss-flansche (weld neck) type 11 din en 1092-1.. General description stud bolts hex bolts , Types of bolts. in petro and chemical industry for flange connections stud bolts and hex bolts are used. the stud bolt is a threaded rod with 2 heavy hexagon nuts.

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