2000NF L22-441:2000 Aircraft bolts and nuts - Nuts, hexagonal, plain, reduced height, reduced across flats, ISO M or ISO MJ threads, 4H5H or 5H tolerance class according to diameter.
1993NF L22-441:1993 HEXAGONAL NUTS. REDUCED HEIGHT. REDUCED ACROSS FLATS. ISO RH THREAD. 4H5H OR 5H TOLERANCE CLASS ACCORDING TO DIAMETER.