Metric Socket Head Cap Screw Head Type Standard Material Alloy Steel Black Oxide Finish Thread Size 0.50mm Drive Type Hex Socket Drive Size 17mm Thread Type Fine Thread Style Partially Threaded Thread Direction Right Hand Length under Head 100mm Thread Length 52mm Head Height 20mm Thread Dia M20 Head Dia 30mm Rockwell Hardness 40 to 43 Min Tensile Strength 176 900 psi Meets/Exceeds ASTM A574 ANSI B18.3.1M Package Quantity 25