Standard full size electrode designs are specified by the Resistance Welding Manufacturing Alliance – RWMA. These designs can be found in the RWMA Resistance Welding Manual. The RWMA standard sizes are #4, #5, #6 and #7. These sizes represent full size electrodes with body dimensions of 1/2”, 5/8”, 3/4” and 7/8” diameter respectively. These electrodes can be purchased in RWMA Class 1, 2 or 3 materials. RWMA face configurations A, B, C, D, E and F are standard. Full size electrodes are stocked in sizes 4, 5, & 6 in most Classes of material and nose designs. Size 7 is available is some configurations. Full size electrodes are available in overall lengths from 1to 4”.
RWMA Full Size Electrode “A” Nose
Ref: RWMA, Resistance Welding Manual