<p>Machine Screw, Head Type Round, Carbon Steel, Length 1/2&quot;, Drive Type Combination Slotted/Phillips, Finish Zinc Plated, Thread Size 4-40, Driver Size #1, Head Dia. 0.193&quot;, Head Height 0.075&quot;, Rockwell Hardness B70, Meets/Exceeds ANSI B18.6.3, Package Quantity 100</p> <p><br /><b>Features</b></p> <ul> <li>Finish: zinc plated</li> <li>Item: Machine Screw</li> <li>Length: 1/2&quot;</li> <li>Material: carbon steel</li> <li>Thread Size: 4-40</li> <li>Drive Type: Combination Slotted/Phillips</li> <li>Driver Size: #1</li> <li>Head Type: Round</li> <li>Meets/Exceeds: ANSI B18.6.3</li> <li>Rockwell Hardness: B69 to B100</li> <li>Head Dia.: 0.211&quot;-0.193&quot;</li> <li>Head Height: 0.086&quot;-0.075&quot;</li> <li>System of Measurement: Inch</li> </ul> <p></p>