BSF 1/4 Socket Cap Screw High Tensile 12.9 DIN912

  
BSF 1/4" Socket Cap Screw High Tensile 12.9 DIN912 BSF, 1/4", Allen/ Hexagon Socket, Cap Head, Screw/ Bolt, High Tensile (12.9), BS 2470. A screw is fully threaded and a bolt is partialy threaded. Socket,' refers to the hexagon shaped indentation found on the top of the fasteners' head.