UNC 1/2" Socket Screw Countersunk High Tensile 10.9 DIN7991

UNC 1/2" Socket Screw Countersunk High Tensile 10.9 DIN7991 UNC 1/2" (13 T.P.I.), Coarse Pitch, High Tensile (Grade 12.9), Self Colour. This space of unthreaded area confirms that the fastener is now a bolt (socket countersunk bolt in this case) and is shouldered.