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1-3/8"-12 UNF A563 Gr.A HVY Hex Nut
1-3/8"-6 UNC A563 Gr.A HVY Hex Nut HDG
1-3/8"-6 UNC (NE) Nylon L/N1-3/8"-12 UNF (NE) Nylon L/N1-3/8"-6 UNC A563 Gr.A HVY Hex Nut
1-3/8"-6 UNC Gr.C (Top-Lock) All Metal L/N 1-3/8"-12 UNF Gr.C (Top-Lock) All Metal L/N 
1-3/8"