1/4"-20 UNC-3B Heavy Hex Nylon Insert Lock Nut Zinc Zinc Plated / ESNA - Grade 5 Or Better Thread Class - 2b Or 3b Or Better Gr.5 L/N - R. E. Glover Ltd.
1/4"-20 UNC-2B/3B HVY Nylon L/N / ESNA - Gr.5 Or Better Thread Cl.- 2b Or 3b Or Better
1/4"-20 UNC-3B Heavy Hex Nylon Insert Lock Nut Zinc Zinc Plated / ESNA - Grade 5 Or Better Thread Class - 2b Or 3b Or Better Gr.5 L/N