2000NF L22-571:2000 Aircraft bolts and nuts - Nuts, anchjor, self-locking, two lug, reduced series, with counterbore, ISO M or ISO MJ threads, in steel, cadmium plates, MoS2 lubricated - Classification : 1 100 MPa (at ambient temperature) / 235 oC.
1978NF L22-571:1978 SELF-LOCKING ANCHOR NUTS,MINATURE SERIES,TWO LUGS,DEEP COUNTERBORE IN CADMIUM-PLATED 25 CD 4 S STEEL. ISO THREAD.