Patent ID: 7437976

Claim:
A blocking nut ensemble for positional placement on a threaded shaft, said blocking nut ensemble comprising: a first internally threaded nut for threading on a shaft, said first nut including a first abutting face having intermediate inner and outer sidewalls depending therefrom, said inner and outer sidewalls defining an annular groove in said first nut; a second internally threaded nut for threading on the shaft, said second nut having a second abutting face and an annular locking flange extending therefrom, said annular locking flange radially positioned in registration with said annular groove in said first nut when said first nut and said second nut are axially aligned; and further wherein: said annular flange is received in said annular groove when said first abutting face abuts said second abutting face, locking said first nut to said second nut; and at least one of said sidewalls defining said annular groove further defines an undercut.