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Single-phase compounds NdCo[SUB12-x]V[SUBx] (x=2.2-2.6) crystallizing in the tetragonal ThMn[SUB12] structure with space group I4/mmm are synthesized. The lattice parameters a and c increase linearly with increasing V content. The Curie temperature of the compounds shows a linear decrease from 309 K for x=2.2 to 147 K for x=2.6. A domain-wall pinning phenomenon is observed in all of the compounds. It is intriguing that the Nd ions seem to make no contribution to the total moment of the compounds in an applied magnetic field up to 50 kOe. A further increase of the applied field induces a moment of a Nd sublattice that ferromagnetically couples with the moment of a Co sublattice. The instability of the Nd moment in NdCo[SUB12-x]V[SUBx] compounds can be well understood by the local environment effect. [ABSTRACT FROM AUTHOR]