Lead Nut Only, SN Style, Thread Mount, 0.250 in X 0.031 in, Non-Preloaded, RH, Acetal, 45 lbf Design Load Description Our standard SN nuts have proven themselves for the past twenty years. Available in sizes from 3/16” to 1-1/2” with or without mounting flanges. (flanges sold separately) Dimension A 16.0 mm (0.63 in) B 12.7 mm (0.50 in) C 4.8 mm (0.19 in) TH 9/16-18 Performance Max Dynamic Load 200 N (45 lbf)