The 811262-1 is a nut driver tool manufactured by TE Connectivity/AMP brand, specifically designed for assembling female screwlocks to AMPLIMITE subminiature D-type connector flanges. This tool is constructed from cold-rolled steel with zinc-plated finish (available in clear or yellow chromate) and is compatible with female screwlock kits used on metal-shell and all-plastic connectors (HDE, HDF, HDP series). The nut driver accommodates various thread sizes including 4-40, M3 (metric), and 2-56, enabling efficient assembly of connector hardware across multiple connector configurations. This tool is essential for field technicians and assembly operations requiring reliable and consistent fastening of subminiature D-type connector assemblies in aerospace, military, and industrial applications.