StarTech 4-40 x 6mm Long Nuts - 50 Pack NUT4_40_6 Keep handy #4-40 threaded nuts commonly used for external D-sub connectors and cables Nuts #4-40 x 6mm long - 50 Pack This package of 50 #4-40x6mm Nuts are convenient to have on hand for new system builds, system upgrades/overhauls or system repairs.