2000NF L22-461:2000 Aircraft bolts and nuts - Nuts, hexagonal, plain, reduced height, normal across flats, with locking holes, ISO M or ISO MJ threads, fine pitch threads, 4H5H tolerance class
1987NF L22-461:1987 HEXAGONAL NUTS. REDUCED HEIGHT. NORMAL ACROSS FLATS WITH LOCKING HOLES. ISO RH THREAD,4H5H CLASS,FINE PITCH.