Alloy Steel Socket Cap Screw， Black Oxide Finish， Internal Hex Drive， Meets DIN 912/ISO 898， 40mm Length， Partially Threaded， M3-0.5 Metric Coarse Threads， Imported (Pack of 100)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Socket Cap Screws are durable and reliable</li><li>Alloy Steel is one of the strongest materials used in fasteners， making this an ideal material to use when the primary concern is the application pulling apart</li><li>Socket cap head fasteners are very common in industrial applications</li><li>Drive system is a hexagon-shaped hole</li><li>Coarse threads are better for brittle materials， and will assemble and disassemble more quickly than fine threads</li></ul></div><img src="http://ecx.images-amazon.com/images/I/415Q%2BMCJNXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31J1KCG3h5L.jpg" noproxy>