18-8, US, 3", Allen

US Fasteners, 18-8, 3", Allen
Socket screws Screws with an Allen wrench drive.	Sex bolts & Mating screws Sex bolts resemble machine screws, but with internal threads, and can be used with either specialized mating screws or standard machine screws. Also known as barrel nuts and Chicago bolts.
Shoulder bolts Screws with an unthreaded shoulder that is larger in diameter than the threads. Also known as stripper bolts.