Standard female cap designs are specified by the Resistance Welding Manufacturers Alliance – RWMA. These designs can be found in the RWMA Resistance Welding Manual. The standard sizes are #4, #5 and #6. These sizes represent female cap electrodes with body sizes of ½”, 5/8” and ¾” Diameter body sizes 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. Female caps are stocked in these sizes and are usually available from stock in most standard nose configurations.
RWMA Female Cap “A” Nose
Ref: RWMA, Resistance Welding Manual