TYPE 4 Full Profile-Functional Diameter Size
Full ribbed rolls for functional sizes coarser than 48 T.P.I (For 48 T.P.I and finer the ribs locate on alternate threads)
TYPE 4 Cone & Vee Single Element Pitch Diameter
Two ribs ("vee type") on lower rolls (1 and 3) One rib ("cone type") on upper roll (2) Flank contact limited
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