Nelson CFL and MD fully threaded studs have a short length of pitch diameter weld base. This length is melted off during the stud welding process so that usable thread extends down to the top of the weld flash on installed studs.

Nelson CPL and MP partially threaded studs are recommended for fastening applications to heavy gauge base materials where development of the full fastener strength is needed. These partially threaded studs have a pitch diameter weld base and are available in thread diameters of 1/4-20 through 1-8 (M6 through M24) with unlimited length.

Nelson CJL and MR reduced base threaded studs have a smaller weld base diameter than that of Nelson Pitch Diameter.

Nelson PFL paint groove studs feature helical grooves running through the threads axially along the length of the stud. These grooves allow the application of paint without the use of a protective cover, as the bulk of the paint flows down the grooves and does not become trapped in the threads.

Nelson HBL the full diameter weld base gives a larger cross-sectional area through the weld zone than on the CPL pitch diameter studs. The increased area is desirable with special stud alloys or when studs are to be welded to specialty base materials.