Used on mercury 25, 25 sea pro, super 15 (2 cylinder) outboard motors. right-hand 28 thread quantity per inch nut 0.250-28 clamp bracket assembly technical sheet ref. number 8
Used on 55/60 (3 cylinder) jet 40/45 outboard motors. 20 thread quantity per inch electrical components technical sheet ref. number 12; also appears in steering handle kit technical sheet ref. number 29; starter motor technical sheet ref. number 12